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- W2152632303 abstract "We have synthesized a series of cluster assembled materials in which the building blocks are As73− clusters linked by group 12 metals, Zn, Cd and Hg, to investigate the effect of covalent linkers on the band gap energy. The synthesized assemblies include zero dimensional assemblies of [Zn(As7)2]4−, [Cd(As7)2]4−, [Hg2(As7)2]4−, and [HgAsAs14]3− in which the clusters are separated by cryptated counterions, and assemblies in which [Zn(As7)2]4−, [Cd(As7)2]4− are linked by free alkali atoms into unusual three-dimensional structures. These covalently linked cluster-assembled materials have been characterized by elemental analysis, EDX and single-crystal X-ray diffraction. The crystal structure analysis revealed that in the case of Zn and Cd, the two As73− units are linked by the metal ion, while in the case of Hg, two As73− units are linked by either Hg–Hg or Hg–As dimers. Optical measurements indicate that the band gap energy ranges from 1.62 eV to 2.21 eV. A theoretical description based on cluster orbital theory is used to provide a microscopic understanding of the electronic character of the composite building blocks and the observed variations in the band gap energy." @default.
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- W2152632303 date "2012-01-01" @default.
- W2152632303 modified "2023-10-01" @default.
- W2152632303 title "Synthesis, structure and band gap energy of covalently linked cluster-assembled materials" @default.
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- W2152632303 doi "https://doi.org/10.1039/c2dt31286g" @default.
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