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Structure and Characterization of a Zero-Dimensional Alkali Tin Dihalides Compound Cs3Sn3F2Cl7 with the [Sn2F2Cl4](2-) Clusters.
Title Structure and Characterization of a Zero-Dimensional Alkali Tin Dihalides Compound Cs3Sn3F2Cl7 with the [Sn2F2Cl4](2-) Clusters.
Authors Gong, P.; Luo, S.; Xiao, K.; Huang, Q.; Yang, Y.; Huang, H.; Wu, Y.; Chen, C.; Lin, Z.
Journal Inorg Chem
DOI 10.1021/acs.inorgchem.7b00036
Abstract

A new perovskite stoichiometric alkali tin dihalides compound, Cs3Sn3F2Cl7, is synthesized by a hydrothermal method. This compound belongs to the monoclinic space group of P21/c with cell parameters of a = 9.5645(4) Å, b = 14.2057(7) Å, c = 13.5828(6) Å, and β = 93.2450(10)°. Unlike the common perovskites in which octahedra are interconnected to be a three-dimensional network, Cs3Sn3F2Cl7 possesses a zero-dimensional structure consisting of Cs(+) cations, isolated [SnCl3](-) trigonal pyramids, and dimer structural units [Sn2F2Cl4](2-); the latter microscopic unit is found for the first time. The thermal stability and UV-vis-NIR diffuse reflectance spectroscopy in Cs3Sn3F2Cl7 are measured, and the electronic structure is calculated. Interestingly, the 5s(2) lone-pair electrons on Sn(2+) cations are stereochemically active, which results in a pretty good photocatalytic activity of the title compound.