title: Structure and Characterization of a Zero-Dimensional Alkali Tin Dihalides Compound Cs3Sn3F2Cl7with the [Sn2F2Cl4]2-Clusters.
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, Cs3Sn3F2Cl7possesses 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 Cs3Sn3F2Cl7are measured, and the electronic structure is calculated. Interestingly, the 5s2lone-pair electrons on Sn2+cations are stereochemically active, which results in a pretty good photocatalytic activity of the title compound.
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Pifu
authors.identifier: http://orcid.org/0000-0002-4656-1554
authors.initials: P
authors.lastname: Gong
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Siyang
authors.initials: S
authors.lastname: Luo
authors.affiliation: School of Materials Science and Technology, China University of Geosciences Beijing , Beijing 100083, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Xiao
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Qian
authors.identifier: http://orcid.org/0000-0002-7284-2042
authors.initials: Q
authors.lastname: Huang
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
authors.affiliation: School of Materials Science and Technology, China University of Geosciences Beijing , Beijing 100083, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Huang
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Yicheng
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Chuangtian
authors.initials: C
authors.lastname: Chen
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Zheshuai
authors.initials: Z
authors.lastname: Lin