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Blue-shifted and naked-eye recognition of H2PO4− and acetylacetone based on a luminescent metal−organic framework with new topology and good stability
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Shuli Yaoa, Hui Xua, Tengfei Zhenga, Yunwu Lic, Haiping Huanga, Jun Wangb, Jinglin Chena, Suijun Liua, b, *, Herui Wena, *
Chinese Chemical Letters | 2023, 34(4) : 107532
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Chinese Chemical Letters | 2023, 34(4): 107532
• Communication •
Blue-shifted and naked-eye recognition of H2PO4− and acetylacetone based on a luminescent metal−organic framework with new topology and good stability
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Shuli Yaoa, Hui Xua, Tengfei Zhenga, Yunwu Lic, Haiping Huanga, Jun Wangb, Jinglin Chena, Suijun Liua, b, *, Herui Wena, *
Affiliations
  • a School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
  • b Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou 350108, China
  • c Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China
Published: 2023-04-15 doi: 10.1016/j.cclet.2022.05.046
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Fluorescence detecting both organic and inorganic analytes has aroused tremendous scientific interests, because fluorescence techniques have high sensitivity and are easy to operate. A new three-dimensional (3D) MOF {[(CH3)2NH2][Zn3(bbip)(BTDI)1.5(OH)]·DMF·MeOH·3H2O}n (JXUST-13, bbip = 2,6-bis(benzimidazol-1-yl)pyridine and H4BTDI = 5,5′-(benzo[c][1,2,5]thiadiazole-4,7-diyl)diisophthalic acid) with new 4,4,8-connceted topology has been successfully synthesized and structurally characterized. Importantly, JXUST-13 could recognize H2PO4− and acetylacetone (Acac) by obvious fluorescence blue shift and slight enhancement with the detection limits of 2.70 µmol/L and 0.21 mmol/L, respectively. In addition, JXUST-13 exhibits relatively good thermal stability, chemical stabilities as well as reusability, and the analytes could be distinguished by naked eye and fluorescence test paper. Remarkably, JXUST-13 is the first dual-responsive MOF sensor based on fluorescence blue shift for the detection of H2PO4− and Acac with good selectivity in a handy, economic, and environmentally friendly manner.

Metal-organic framework  /  Fluorescence sensing  /  Naked-eye recognition  /  Fluorescence blue shift  /  H2PO4− and acetylacetone
Shuli Yao, Hui Xu, Tengfei Zheng, Yunwu Li, Haiping Huang, Jun Wang, Jinglin Chen, Suijun Liu, Herui Wen. Blue-shifted and naked-eye recognition of H2PO4− and acetylacetone based on a luminescent metal−organic framework with new topology and good stability[J]. Chinese Chemical Letters, 2023 , 34 (4) : 107532 - . DOI: 10.1016/j.cclet.2022.05.046
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With environmental pollution being more and more serious, the detection of toxic contaminants including organic and inorganic substances becomes a hot research field. In recent years, fluorescence sensors for detecting analytes have aroused tremendous scientific interests, because fluorescence techniques have high sensitivity and are easy to operate. Metal-organic frameworks (MOFs) with unique structures advantages and diverse properties, such as chemical sensors [1], catalysis [2], gas adsorption and separation [3, 4], drug delivery [5], conduction [6, 7], have become star materials in materials and chemistry. Many MOFs are reasonably designed [8, 9]. In addition, MOFs as fluorescence sensors, possess the advantages of good selectivity, high sensitivity, short response time and low cost, etc. [1], which were widely applied in detecting anions [10], volatile organic compounds [11], explosives [12], cations and antibiotics [13, 14], organic molecules [15, 16], etc. Three effects are displayed in the MOF fluorescence sensing, including fluorescence quenching (turn-off effect), fluorescence enhancement (turn-on effect) and fluorescence shift. Compared to turn-off effect, turn-on effect has higher sensitivity and is easier to identify; fluorescence shift has a noticeable color change, which could clearly distinguish target analytes with other substances. Therefore, exploring shifted and turn-on MOFs sensor is significant and meaning.
Both inorganic phosphates (mainly PO43−, HPO42− and H2PO4−) and organic molecule acetylacetone (Acac) are toxic. Phosphates are essential nutritional ingredients during the growth of the organism, and play important roles in building energy carriers, nucleic acids and proteins in biological systems [17]. The high levels of phosphates have a direct correlation to cardiovascular disease and kidney failure, and the low levels of phosphates could cause hypophosphatemia in biological liquids [18]. In addition, high concentration of phosphates released in aquatic ecosystems could cause serious environmental problems, such as eutrophication and overgrowth of algae in aquatic systems [19]. Therefore, it is highly essential to detect inorganic phosphates. As for Acac, it is extensively used in industry, including modifier, chelating agents, intermediate, precursor, additive etc. [20]. Due to the toxicity, volatility and flammability, Acac exposed to the air could cause environmental pollution and health problems, such as nausea, headache and vomiting upon inhalation [20]. Thus, it is urgent to develop advanced materials for rapidly and sensitively recognizing Acac.
Compared with other analytical techniques, MOFs-based fluorescence recognition has become more popular due to the significant advantages, and large numbers of MOF-based fluorescence sensors for various analytes have been reported. To date, many MOF sensors for PO43− have been reported [21-25], while only four MOF-based fluorescence sensors for H2PO4− were investigated with turn-off effect or post-synthetic modification [26-29], and the blue-shifted sensor toward H2PO4− is just one [28]. In addition, a large number of MOF sensors for Acac were studied in recent years [30-37]. However, most of them displayed turn-off effect, and only three turn-on [32, 35, 36] and one red-shifted [37] MOF sensors were explored. Blue-shifted MOF sensor toward Acac has never been reported. Thence, it is worthy and meaningful to develop dual functional fluorescence blue-shifted MOF sensor for detecting of H2PO4− and Acac.
Given these background and knowledge, luminescent MOF was rationally designed and constructed by ZnⅡ ion, basic bis(benzimidazol)pyridine and acidic benzothiadiazole-functionalized ligands. Bis(benzimidazol)pyridine ligand has potential uncoordinated active site, which is beneficial to interact with analyte. Benzothiadiazole derivatives with π-conjugated and electron-deficient group, which possess excellent visible optical and electronic properties [38], are good candidates for fluorescent material. It should be noted that ZnⅡ-based MOFs for detecting analytes are based on ligand-centered luminescence [27]. However, ligand-center-based luminescence sensors have small Stokes shifts, and the color difference between the excitation and emission light is not obvious, which prevents the naked eye recognition of analytes [27]. Herein, a novel luminescent MOF {[(CH3)2NH2][Zn3(bbip)(BTDI)1.5(OH)]·DMF·MeOH·3H2O}n (JXUST-13) with 3D new topology was successfully synthesized by 5,5′-(benzo[c][1,2,5]thiadiazole-4,7-diyl)diisophthalic acid (H4BTDI) and 2,6-bis(benzimidazol-1-yl)pyridine (bbip) ligands (Scheme S1 in Supporting information). Importantly, JXUST-13 could successfully sense H2PO4− and Acac via fluorescence blue shift and naked eye. To the best of our knowledge, JXUST-13 is the first dual-responsive MOF sensor toward H2PO4− and Acac based on fluorescence blue shift.
Single-crystal X-ray diffraction analysis reveals that JXUST-13 crystallizes in monoclinic system P21/n space group and takes a 3D framework (Table S1 in Supporting information). The asymmetric unit includes three crystallographically independent ZnⅡ ions, one bbip ligand, one and a half BTDI4− ligands, one µ3-OH, one (CH3)2NH2+ cation, one DMF, one MeOH and three H2O molecules. As shown in Fig. 1a, Zn1 ion displays a six-coordinated environment constructed by one N atom (N1B) from one bbip ligand and five O atoms (O1B, O4C, O8A, O10 and O13) from four BTDI4− ligands and one µ3-OH. Zn2 ion exhibits a four-coordinated environment building with three O atoms (O3C, O9 and O13) from two BTDI4− ligands and one µ3-OH, and one N atom (N5) from one bbip ligand; Zn3 ion behaves a four-coordinated environment with four O atoms (O2B, O5, O11A and O13) from three BTDI4− ligands and one µ3-OH. The coordination geometries of ZnⅡ ions could be viewed as octahedron, tetrahedron and tetrahedron, respectively, calculated by SHAPE 2.1 software (Table S3 in Supporting information) [39]. Moreover, the adjacent ZnⅡ ions constitute a [Zn3(µ3-OH)(COO)3] secondary building unit (SBU), which constructed by one µ3-OH and three bridging carboxylates. The distances of Zn-O and Zn-N bonds are in the range of 1.948(3)–2.141(4) Å and 2.002(4)–2.140(4) Å, respectively (Table S2 in Supporting information). Furthermore, the SBUs are linked by BTDI4− ligands to build a two-dimensional (2D) layer structure (Fig. S1 in Supporting information). The 2D layers are further connected by bbip and BTDI4− ligands to conform a 3D framework (Fig. 1b). Interestingly, the BTDI4− ligands display two different coordination fashions in JXUST-13 (Fig. S2 in Supporting information). The topological analysis indicates that JXUST-13 takes a new 4,4,8-connceted topology with Schlafli symbol {3.43.52}2{32.42.52}{34.46.58.610}2 rationalized by TOPOS 4.0 [40]. Among them, the BTDI4− ligand is considered as a 4-connected node, and the [Zn3(µ3-OH)(COO)3] SBU is viewed as a 8-connected node (Fig. 1c). The total solvent-accessible volume of JXUST-13 is 2048.0 Å3 and the porosity is 30.3% per unit cell without solvent molecules, which is estimated by PLATON [41]. In addition, the porous property of JXUST-13 also was carried out by N2 adsorption−desorption isotherm experiment. As displayed in Fig. S3 (Supporting information), type I adsorption isotherm is obtained, and the calculated BET surface area is 371.2 m2/g, which verify the existence of microporous pores in JXUST-13.
The chemical stabilities in organic solvents, neutral H2O, acid-base aqueous solutions were also determined by PXRD patterns. The peak positions of PXRD patterns of JXUST-13 soaked in pyridine, n-hexane, acetonitrile, tetrahydrofuran (THF), methanol (MeOH), dimethyl sulfoxide (DMSO), N,N-dimethylacetamide (DMA), N,N-dimethylformamide (DMF), CH2Cl2, acetone and Acac for 24 h basically unchanged, revealing the framework still retains and JXUST-13 displays good solvent stability (Fig. 2a). Besides, NaOH and HCl were used to prepare aqueous solution with different pH values. The samples were soaked in the aqueous solution with pH values scope from 2 to 12 for 12 h, and PXRD patterns remained unchanged (Fig. 2b), indicating relatively good acid-base stability of JXUST-13.
MOFs constructed by metal centers with d10 electronic configuration and conjugated organic ligands are potential fluorescence sensing material [30]. Therefore, JXUST-13 was explored the fluorescence sensing properties toward analytes. The solid emission spectra were measured at room temperature. As shown in Fig. S4 (Supporting information), the emission peaks of H4BTDI and bbip are observed at 515 nm (λex = 370 nm) and 374 nm (λex = 330 nm), respectively, which could be ascribed to the π* → π or π* → n electron transition within the ligands [34]. While, the emission band of JXUST-13 appears at 493 nm (λex = 370 nm), which may stem from the metal-perturbed intraligand charge transfer because of the d10 electron configuration of ZnⅡ. Compared with H4BTDI ligand, the emission band of JXUST-13 displays an obvious blue shift resulted from coordination interactions between metal ions and organic ligands [35].
Due to the environmentally friendly characteristic, similar emission band with solid state (Fig. S5a in Supporting information), as well as good stability in EtOH solution, EtOH was chosen as dispersant to explore the sensing behavior of JXUST-13. JXUST-13 was fully grinded and added to EtOH solution with the concentration of 0.25 mg/mL. After ultrasonic treatment for 30 min, a stable suspension was obtained. 5 µL Different anions aqueous solution (including ACO−, NO3−, Br−, Cl−, F−, I−, CO32−, SO42−, WO42−, HCO3−, PO43−, HPO42− and H2PO4−, 0.2 mol/L, potassium or sodium salt, and the cations almost have no influence on the emission, Fig. S5b in Supporting information) were added to 2 mL EtOH suspension in 3 mL quartz cuvette for testing. As illustrated in Fig. 3a, the fluorescence performances have important relationship with anions type. Most of anions did not occur significant fluorescence changes, while H2PO4− displayed an obvious fluorescence blue shift and slight enhancement, which could be distinguished by naked eye under 365 nm portable UV lamp (Fig. 3a, illustration). The color change from green to blue also is confirmed by CIE chromaticity diagram (Fig. 3b). The result revealed that JXUST-13 displayed good selectivity toward H2PO4− by fluorescence blue shift. The anti-interference experiment also was performed with 5 µL H2PO4− and the same concentration of other anions into EtOH suspensions, and the fluorescence blue shift still exists (Fig. S6a in Supporting information), implying the remarkable sensitivity of JXUST-13 toward H2PO4−.
Moreover, the fluorescence titration experiments were carried out with increasing H2PO4− concentration (0.02 mol/L). As manifested at Fig. 3c (illustration), the fluorescence change with blue shift and enhancement by the increasing of H2PO4− concentration. A good linear correlation of fluorescence intensity ratios I/I0 and concentration with R2 = 0.998 was obtained (Fig. 3d). The detection limit was 2.70 µmol/L calculated by the formula of 3σ/k (σ: the standard error; k: the slope). These results indicated that JXUST-13 could be viewed as a fluorescence blue-shift sensor toward H2PO4− with high sensitivity and selectivity.
The possible sensing mechanism of JXUST-13 toward H2PO4− was discussed. The peak positions of PXRD patterns about JXUST-13 immersed in EtOH and H2PO4− solution for 24 h remained unchanged (Fig. S8c in Supporting information), indicating that basic framework remained intact after reacting with H2PO4−, thus, it excluded the impact of skeleton collapse. The IR spectrum of JXUST-13 incubated with H2PO4− and EtOH showed no obvious peak positions shift compared with JXUST-13 (Fig. S10 in Supporting information), demonstrating that there are no coordination or hydrogen bonding interactions between H2PO4− and JXUST-13. The XPS results also indicated that there was no coordination interaction due to the similar binding energy of Zn 2p (Fig. S11a in Supporting information). Besides, the XPS spectra of O 1s, N 1s and S 2p also demonstrated that there was no interaction between H2PO4− and O/N/S atoms, which were consistent with IR spectra. In addition, H2PO4− could well disperse in suspension and attach on MOF particles surface, leading to host-guest interactions. The UV−vis absorption spectra of JXUST-13 suspension adding with different anions were characterized. There was an obvious absorption spectral change of H2PO4− ion in JXUST-13 suspension, indicating the possible existence of interaction between H2PO4− and MOF (Fig. S12a in Supporting information). The average fluorescence lifetime (τav) of JXUST-13@H2PO4− (6.12 × 10−3 ms) was shorter than that of JXUST-13 (1.02 × 10−2 ms) (Figs. S13a and b in Supporting information), further revealing the occurrence of excited state interaction between H2PO4− and JXUST-13 [31]. In general, when the excited electrons transferred from a high-lying π*-type lowest unoccupied molecular orbital (LUMO) to the conduction band (CB) of MOF, fluorescence enhancement could emerge [42]. As shown in Fig. S14 (Supporting information), there was no overlap between absorption spectrum of H2PO4− and the emission spectrum of MOF, therefore, fluorescence resonance energy transfer (FRET) is not the mechanism of the observed fluorescence enhancement. Moreover, the observed fluorescence blue shift may indicate the formation of strong exciplex between JXUST-13 and H2PO4− [43]. Exciplex is an excited complex, which generally formed through the interaction of an excited molecule with an unexcited molecule. Therefore, the obvious fluorescence blue shift and slight enhancement of JXUST-13 toward H2PO4− may be due to the formation of exciplex and charge transfer between H2PO4− and framework.
The same method of anions sensing was used to prepare EtOH suspension of JXUST-13. The fluorescence sensing performances toward common small organic molecules also were explored. 5 µL different organic molecules including DMF, DMA, 1-propanol, ethylene glycol, pyridine, n-hexane, acetonitrile, THF, MeOH, DMSO, CH2Cl2, acetone, formaldehyde and Acac were added to 2 mL EtOH suspension and tested in 3 mL quartz cuvette. As exhibited in Fig. 4a, fluorescence behaviors were relevant to the type of organic molecules. Among them, Acac manifested obvious fluorescence blue shift and slight enhancement, and other of them had weak influence on the emission. In addition, the fluorescence blue shift could be easily identified by naked eye under 365 nm portable UV lamp (Fig. 4a, illustration) and the CIE chromaticity diagram (Fig. 4b). These results indicated that JXUST-13 had good selectivity for Acac by fluorescence blue shift. Furthermore, the anti-interference experiment also was performed. 5 µL other organic molecules with Acac were added into EtOH suspensions, and the fluorescence blue shift still exists (Fig. S6b in Supporting information), further confirming that JXUST-13 had excellent sensitivity toward Acac by fluorescence blue shift.
In order to explore the fluorescence performance of JXUST-13 with different concentration of Acac, the titration experiment was carried out with Acac diluted to 30% (v/v). The fluorescence showed blue shift and enhancement with the increasing of Acac concentration (Fig. 4c, illustration). Besides, the correlation between fluorescence intensity ratio I/I0 and concentration was also measured at low concentration range, which revealed a good linear correlation with R2 = 0.998 (Fig. 4d). The detection limit was 0.21 mmol/L calculated by 3σ/k. These results indicated that JXUST-13 can be considered as a potential sensor for Acac by fluorescence blue shift with good sensitivity and selectivity.
The possible sensing mechanism of JXUST-13 toward Acac was elucidated. The PXRD pattern indicated that framework of JXUST-13 kept intact after detecting Acac (Fig. S8c in Supporting information). Acac can be well dispersed in suspension, and host-guest interaction is easy to occur. The UV−vis absorption spectra demonstrated the possible presence of interaction between Acac and JXUST-13, due to the obvious change of absorption spectrum after adding Acac into JXUST-13 suspension (Fig. S12b in Supporting information). Moreover, the average fluorescence lifetime (τav) further proved the excited state interaction between JXUST-13 and Acac, because the lifetime of JXUST-13@Acac (6.13 × 10−3 ms) was shorter than that of JXUST-13 (1.02 × 10−2 ms) (Figs. S13a and c in Supporting information) [31, 44]. It is well known that Acac has keto−enol tautomerism, which might introduce H-bonding interaction between the -OH moiety of enol form of Acac and the oxygen atoms of ligand [30]. The IR spectrum about JXUST-13 incubated with Acac and EtOH showed that there was a peak position shift from 1373 cm−1 (JXUST-13) to 1381 cm−1 (JXUST-13@Acac), corresponding to the symmetric stretching of −COO− [21], which might manifest the formation of hydrogen bond interaction between JXUST-13 and Acac (Fig. S10 in Supporting information). In addition, due to the d10 electronic configuration of ZnⅡ, the fluorescence of Zn-MOFs mostly stems from the intraligand charge transfer. In general, the excited electrons transfer from a high-lying π*-type LUMO to the CB of MOFs, fluorescence enhancement could occur [42, 45]. While FRET is not the possible mechanism of fluorescence enhancement, owing to no overlap between absorption spectrum of Acac and the emission spectrum of JXUST-13 (Fig. S14 in Supporting information). Moreover, the observed fluorescence blue shift may be the formation of exciplex between MOF and Acac [42, 43]. Therefore, the possible sensing mechanisms of fluorescence blue shift and slight enhancement toward Acac were the existence of H-bonding interaction, the formation of exciplex and charge transfer between Acac and JXUST-13.
Reusability also was an important index in practical applications. Thus, a quick and easy way of cycleability toward H2PO4− and Acac was performed. The as-synthesized sample of JXUST-13 was soaked in 2 mL EtOH and 5 µL H2PO4−/Acac solutions for 20 min. After washing by ethanol five runs and drying in the air, the samples were characterized with emission spectra and PXRD patterns. The fluorescence enhancement and blue shift behavior still retained (Figs. 5a and b). The PXRD patterns of JXUST-13 after five times cycle matched well with the simulated one (Fig. S8d in Supporting information), revealing the good stability of framework during the cyclic process. Thence, JXUST-13 could be recycled at least five times for H2PO4− and Acac sensing.
In addition, fluorescent test paper was a fast and portable method to detect analytes. The filter papers with suitable size were immersed in EtOH suspension and air dried. Then the test papers were putted into H2PO4− or Acac solution, respectively. Importantly, blue lights were discovered on the fluorescent test papers under excited at 365 nm UV portable lamp (Fig. 6), which revealed that JXUST-13 could fastly detect H2PO4− and Acac with a test paper.
In summary, a new 3D ZnⅡ-based MOF (JXUST-13) with new 4,4,8-connceted topology has been successfully designed and synthesized by mixed-ligands strategy. Importantly, JXUST-13 could detect H2PO4− and Acac by obvious fluorescence blue shift and slight enhancement in EtOH suspension. The sensing mechanism of H2PO4− may be ascribed to the formation of exciplex and charge transfer between H2PO4− and JXUST-13. And the sensing mechanism for Acac may be attributed to hydrogen bonding interactions, the formation of exciplex and charge transfer between Acac and JXUST-13. In addition, it could also be quickly and conveniently recognized by naked eye and fluorescence test papers. To our best knowledge, JXUST-13 could act as the first dual-responsive MOF sensor based on fluorescent blue shift and naked-eye detecting of H2PO4− and Acac. Further researches of MOF fluorescence probes are underway in our lab.
Declaration of competing interest
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The authors declare no competing financial interest.
Acknowledgments
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This work was supported by the National Natural Science Foundation of China (Nos. 22061019, 21861018, 22161019 and 12174172), the NSF of Jiangxi Province (No. 20202ACBL213001), Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry (No. 20212BCD42018), Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University (No. MJUKF-FMSM202010), the Youth Jinggang Scholars Program in Jiangxi Province (No. QNJG2019053), the Two Thousand Program in Jiangxi Province (No. jxsq2019201068) and the Special Foundation for Postgraduate Innovation in Jiangxi Province (No. YC2020-B155).
Supplementary materials
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Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.cclet.2022.05.046.
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Year 2023 volume 34 Issue 4
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doi: 10.1016/j.cclet.2022.05.046
  • Receive Date：2022-03-17
  • Online Date：2025-11-21
  • Published：2023-04-15
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  • Received：2022-03-17
  • Revised：2022-05-08
  • Accepted：2022-05-13
Affiliations
    a School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
    b Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou 350108, China
    c Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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