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按照K_2Se:K_2Te_2:MnCl_2·4H_2O:SnCl_2·2H_2O:Se:乙二胺(en)=3.8:1:2:2:6:270的摩尔比配料,采用溶剂热法使原料混合物在180℃反应7d,得到黑色块状晶体[Mn(en)_3]_2·Sn_2Se_4Te_2。属于三斜晶系。空间群为P1,晶胞参数a=0.91428(7)nm,b=1.02781(7)nm,c=1.15745(8)nm,α=94.632(2)°,β=100.944(2)°,γ=115.918(1)°,V=0.94382(12)nm~3,Z=1。晶体由[Mn(en)_3]~(2+)和(Sn_2Se_4Te_2)~(4-)堆积而成。具有Zintl结构的特征。半导体[Mn(en)_3]_2·Sn_2Se_4Te_2的光学能隙(E_g)为2.2eV。当温度低于190℃时,[Mn(en)_3]_2·Sn_2Se_4Te_2晶体是稳定的。详细讨论了这类化合物的组成对晶体结构和光吸收性能的影响。
According to the molar ratio of K_2Se: K_2Te_2: MnCl_2 · 4H_2O: SnCl_2 · 2H_2O: Se: ethylenediamine (en) = 3.8: 1: 2: 2: 6: 270, the raw material mixture was reacted at 180 ℃ for 7d , To obtain a black massive crystal [Mn (en) _3] _2 · Sn_2Se_4Te_2. Belong triclinic system. The space group is P1 and the unit cell parameters a = 0.91428 (7) nm, b = 1.02781 (7) nm, c = 1.15745 (8) nm, α = 94.632 (2) °, β = 100.944 115.918 (1) °, V = 0.94382 (12) nm ~ 3, Z = 1. The crystal is composed of [Mn (en) _3] ~ (2+) and (Sn_2Se_4Te_2) ~ (4-). Features of Zintl structure. The optical energy gap (E_g) of the semiconductor [Mn (en) _3] _2 · Sn_2Se_4Te_2 is 2.2 eV. When the temperature is lower than 190 ℃, [Mn (en) _3] _2 · Sn_2Se_4Te_2 crystals are stable. The effects of the composition of these compounds on the crystal structure and light absorption properties are discussed in detail.