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Copper-sulfide cluster assembled architecture via in situ reaction
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Hailiang Hua, *, Huan Yanga, Xiuyan Yanga, Ran Wangd, Lan Zhoua, Yi Daia, Ningning Jib, Huanjiang Wanga, Zhiqiang Shib, *, Guoyong Zhoua, Baokuan Chenc, *, Yingchun Luoa, Chaozheng Hed, *
Chinese Chemical Letters | 2020, 31(12) : 3213 - 3215
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Chinese Chemical Letters | 2020, 31(12): 3213-3215
• Communication •
Copper-sulfide cluster assembled architecture via in situ reaction
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Hailiang Hua, *, Huan Yanga, Xiuyan Yanga, Ran Wangd, Lan Zhoua, Yi Daia, Ningning Jib, Huanjiang Wanga, Zhiqiang Shib, *, Guoyong Zhoua, Baokuan Chenc, *, Yingchun Luoa, Chaozheng Hed, *
Affiliations
  • a Cllege of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China
  • b College of Chemistry and Chemical Engineering, Taishan University, Tai'an 271021, China
  • c College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China
  • d Shaanxi KeyLaboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China
Published: 2020-12-15 doi: 10.1016/j.cclet.2020.08.025
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A new copper-thiolate cluster assembled framework [Cu2(μ4-SCH3)Cl]n (1), has been solvothermally synthesized through in situ reaction viz., in situ ligand generation and metal reduction. Compound 1 represents the first 3D framework based on Atlas-sphere functionalized by single μ2-Cl- groups. DOS calculation reveals the interaction of electronic structures. It is found that the HOMO is mainly distributed on Cl, Cu and S bonding orbitals, while the LUMO is dominated by Cu-Cl antibonding orbitals.

Chalcogenide  /  Cluster  /  In situ  /  Assemble  /  Architecture
Hailiang Hu, Huan Yang, Xiuyan Yang, Ran Wang, Lan Zhou, Yi Dai, Ningning Ji, Huanjiang Wang, Zhiqiang Shi, Guoyong Zhou, Baokuan Chen, Yingchun Luo, Chaozheng He. Copper-sulfide cluster assembled architecture via in situ reaction[J]. Chinese Chemical Letters, 2020 , 31 (12) : 3213 -3215 . DOI: 10.1016/j.cclet.2020.08.025
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Metal-thiolate cluster species, among the large family of chalcogenides, represents a topical area of crystal engineering [1-9]. By introduction of different coordinating atoms, types of metal-sulfide clusters, such as binary, ternary, quaternary, could be achieved [10]. The unique range of structural versatility and tunable properties make this field an attractive prospect [11-19]. Scientists have pioneered routes during the past decades, and two predominant structural types have been documented: discrete chalcogenide clusters and extended cluster networks. For metalthiolate cluster discovery, in situ strategy is a promising solution under which the synthons could be gradually generate, and oligomeric structures with rapid aggregation could be prevented [20]. As ongoing effort of cluster chemistry, we have explored approaches for new chalcogenide clusters. In this work, we focus our study intensively on how a stable cluster can be created by "simple components", and yet cluster assembled architecture. For this purpose, a simple reaction based on copper and dimethyl sulfoxide (DMSO) is set up. Copper ion is a widespread precursor for chalcogenides. DMSO is used as a potential sulfide source via in situ decompositon [21, 22]. After numerous attempts, optimized conditions were obtained. Solvothermal reaction of DMSOCu(OAc)2 solution at 160 produced yellow crystals of [Cu2(μ4-SCH3)Cl]n (1).
X-ray single-crystal analysis shows that compound 1 crystallizes in a highly symmetric hexagonal system with space group R-3. The neutral framework is constructed by copper sulfide core [Cu12(μ4-SCH3)6]6+ with a known Atlas-sphere configuration [23, 24]. Connected by μ2-Cl- ligands in three dimensions of the crystal (Fig. 1a), the overall formula of Atlas-sphere is [Cu12(μ4-SCH3)6(μ2-Cl)12]6- (abbreviated as Cu12S6Cl12). Considering the surface modification via functional groups, two main kinds of Atlas-spheres are observed. The first one is different subunits modified cluster [23, 25-27], features types of fragments appended to outer Atlas-surface (e.g., halide anion, Cu-halide, Cu-thiolate). The second one is single group functionalized structure [24]. In this work, each of the twelve Cu atoms in the Atlas-sphere core is uniformly coordinated to a μ2-Cl- ligand. Compound 1 is the first 3D framework based on Atlas-sphere functionalized by single μ2-Cl- groups. Only one similar Atlas-cluster has been reported to our knowledge, in which the bonded Cl- anion acts as capping ligand [28]. In 1, a centrosymmetric {Cu12} cubo-octahedron for {Cu12S6Cl12} with an outer diameter of ~5.90 Å is observed (Fig. 1b, left). Each SCH3- ligand is μ4-bonded to four Cu atoms, and six μ4-SCH3- are arranged into a regular octahedron, with its bearing methyl groups pointing outwards. Each edge of the octahedron has bridged by a CuCl unit, then a {Cl12} cubooctahedron (with an outer diameter of ~10.40 Å), similar with {Cu12} unit, has been observed (Fig. 1b, right). Three mutually perpendicular, coplanar, eight-membered {Cu4S4} rings intersect at the sulfur atoms, giving birth to the known Atlas-sphere (Fig. S1 in Supporting information). Both of the crystallographically independent Cu centers (Cu1 and Cu2) lie in a trigonal coordination sphere that completed by one μ2-Cl- and two μ4-SCH3-ligands. Bond distances around the Cu centers are normal. The μ4-S center adopts a square-pyramidal [SCCu4] geometry, with one carbon atom at the apex and four Cu atoms in the equatorial plane. Note that, distance of Cu1···Cu2 (2.762 Å) observed within the [SCCu4] moiety is slightly shorter than the sum of the van der Waals radius of two Cu atoms (2.80 Å) [29, 30], indicating a weak Cu···Cu interaction.
In compound 1, each {Cu12S6Cl12} cluster is six-connected to adjacent ones by twelve μ2-Cl- ligands, as shown in Fig. 2a. The central {Cu12S6Cl12} unit is octahedral surrounded (Fig. 2b), and the regular octahedral arrangement leads to a high crystallographic symmetry of 1. Self-assemble of {Cu12S6Cl12} clusters and extending infinitely in all three directions of space leads to a 3D microporous framework (Fig. 2c), which contains 17.7% void space (422.7 Å3 of the 2388.5 Å3 unit cell volume) that is accessible to solvent molecules, as calculated by PLATON [31]. A better insight into the nature of this intricate framework is provided by a topology analysis. Herein, each {Cu12S6Cl12} cluster can be defined as a 6-connected node, then the whole framework can be classified as a uninodal pcu net with Schläfli symbol of 412.63 (Fig. 2d).
Worth to mention here is the in situ reactions, including ligand generation (DMSO/SCH3-) and metal reduction (Cu2+/Cu+). To trigger this target, harsh reaction conditions are exploited in our approach. Experimental factors of relative high temperature, small filling capacity, long reaction time, and solution acidification are applied. Optimized conditions drive the in situ process and induces the aggregation of in situ synthons towards the formation of specific {Cu12S6Cl12} cluster. The FT-IR spectrum confirms the existence of SCH3- ligands (Fig. S2 in Supporting information). The CH-stretching mode is observed in region of 3200-2800 cm-1, CH3 deformation locates in 1500-1300 cm-1. A strong band at 945 cm-1 is assigned to the CH3-wagging mode. Characteristic bands at 755 and 708 cm-1 are assigned to the C–S stretching vibrations [32, 33]. Scanning electron microscopy-energy-dispersed X-ray spectroscopy (SEM-EDX) reveals the presence of C, O, S, Cl and Cu elements (Fig. 3a). Atomic molar ratio of Cu/S/Cl calculated from EDX is about 2.0:1.0:0.9, which is close to the theoretical value (2:1:1). Bond valence sum (BVS) calculations show that the Cu centers are +1 valences [34].
Cyclic voltammetry (CV) study of 1 was carried out in 1 mol/L Na2SO4 solution (Fig. 3b). It can be seen that no voltammetric characteristics were changed after several successive cycles, indicating the structural stability of 1 under the studied conditions. In the potential range from +1.0 V to -0.2 V, a couple of reversible redox peaks I/I' at 0.562 and 0.244 V are observed (scan rate: 50 mV/s), which can be ascribed to monoelectronic process of Cu atoms.
To gain a deeper understanding of the interaction of electronic structures, the isodensity surfaces and energy levels for 1 were calculated by Materials Studio software (Accelrys Inc.). Fig. 3c shows the density of states (DOS) of {Cu12S6Cl12} cluster. It can be seen that the energy area of -6.0 to -3.8 eV is basically contributed by the S-p, C-p and Cu-d orbitals. For orbitals with energies around -3.0 eV to -1.0 eV, the higher peaks of Cu-d and Cl-p orbitals indicate that these orbitals are contributed by Cu and Cl atoms. In addition, a peak appears near the Fermi level, indicating that the system has high activity, and this orbital is contributed by Cl-p, Cu-d, and S-p, which is consistent with the results of the orbital isosurface. The highest occupied molecular orbital (HOMO) is mainly distributed on Cl, Cu and S atoms. The binding of electrons is relatively relaxed, thus playing the role of electron donor. The lowest unoccupied molecular orbital (LUMO) is mainly distributed on Cu-Cu bonds and Cl atoms. It has a strong affinity for electrons and has the nature of an electron acceptor. The interaction of the two orbitals plays an important role in the chemical reaction.
In summary, we demonstrate here a new copper-thiolate cluster {Cu12S6Cl12} constructed by an in situ strategy, including in situ ligand generation and metal reduction. Compound 1 represents the first 3D framework based on Atlas-sphere functionalized by single μ2-Cl- groups, combining both cluster chemistry and extended architectures. DOS calculation reveals the contribution of certain atomic orbitals in 1. The HOMO is mainly distributed on Cl, Cu and S bonding orbitals, while the LUMO is dominated by Cu-Cl antibonding orbitals. By applying the approach established in this study, we expect that a new family of metal-thiolate species to be discovered in the future.
Declaration of competing interest
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The authors report no declarations of interest.
Acknowledgments
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This work is supported by the National Natural Science Foundation of China (Nos. 21861012 and 21603109), the Henan Joint Fund of the National Natural Science Foundation of China (No. U1404216), the Natural Science Foundation of Guizhou Education Commission (Nos. 2018148 and 2018016) and Guizhou Science & Technology Commission (Nos. 20201Z005, 20191157 and 20191156), the Natural Science Foundation of Shandong Province of China (No. ZR2016BM14), Tai'an Science & Technology Project (No. 2016GX1046), the Postgraduate Foundation of Taishan University (No. Y2015-1-011), the Natural Science Foundation of Guizhou Minzu University (No. GZMU2019YB06), the Natural Science Foundation of Liaoning Shihua University (No. 2019XJJL-019).
Appendix A. Supplementary data
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Supplementary material related to this article can be found, in the online version, at doi:https://doi.org/10.1016/j.cclet.2020.08.025.
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Year 2020 volume 31 Issue 12
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Article Info
doi: 10.1016/j.cclet.2020.08.025
  • Receive Date：2020-06-15
  • Online Date：2026-01-31
  • Published：2020-12-15
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  • Received：2020-06-15
  • Revised：2020-07-21
  • Accepted：2020-08-17
Affiliations
    a Cllege of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China
    b College of Chemistry and Chemical Engineering, Taishan University, Tai'an 271021, China
    c College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China
    d Shaanxi KeyLaboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, 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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