[(enH)2(enH2)Sn2Se6]的合成、结构及性能研究

采用溶剂热法,以K2Se:SnCl2·2H2O∶Se∶en=1∶1∶4∶48的摩尔比,在150 ℃下反应5d,生成黄色透明柱状晶体[(enH2)2Sn2Se6·en]。该晶体属于三斜晶系 ,空间群为Pl^-,晶胞参数,a=0.8659(2)nm,b=1.1055(2)nm,c=0.66360(10)nm, a=104.44(3)°,β=110.93(3)°,γ=79.74(3)°,V=0.57198(19)nm^3,Z=1.[ (enH2)Sn2Se6]晶体由质子化的乙二胺正离子（enH)^+,(enH2)^2+和二聚硒代锡根 负离子（Sn2Se6)^4-堆积而成。在AxSn2Se6系列化合物,正离子A的大小对晶体结 构的类型产生重要的影响。研究表明,此晶体具有1.76eV的能隙（Eg）,是个半导 体,对太阳辐射具有选择吸收特性,在温度低于180℃时是稳定的。

Solvothermal Synthesis, Crystal Structure and Optical Properties of [(enH)_2(enH_2)Sn_2Se_6] (en = ethylenediamine)

The solvothermal technique was used for the synthesis of [(enH)2 (enH2)Sn2Se6] (en= ethylenediamine) which contains a [Sn2Se6]4- Zintl anion, two [enH] + and one [enH2]2+ cations. The reactants with a molar ratio of K2Se:SnCl2·2H20:Se:en= 1:1:4=48 were reacted at 150 ° C for 7 d. The crystal structure of [(enH)2(enH2)-Sn2Se6] was determined by X-ray crystal structure analysis to belong to triclinic space group P 1 with the unit cell parameters, a =0.86599(2) nm, 6 = 1. 1055(2) nm, c =0.66360(10) nm, α= 104.44(3)°, β= 110.93(3)°, γ= 79. 74(3)°, V-0.57178(19) nm"3, Z = 1. Studies on optical properties for the powder sample suggest that this compound is a semiconductor with a band gap of 1.76 eV and an absorption coefficient of 0.0105 μm-1 to solar radiation. The result of thermogravimetric (TG) analysis indicates that [(enH)2(enH2)Sn2Se6] is stable up to 180 °C .