八钼酸根阴离子有机胺化合物的合成与结构

由MoO3和(CH3)3N或(C2H5)3N反应合成了两种分子组成分别为[(CH3)3NH]4Mo8O26·2H2O(1)和[(C2H5)3NH]4Mo8O26·2H2O(2)的化合物.单晶X衍射结构分析表明,化合物(1)属三斜晶系,空间群为P1,晶胞参数a=1.0500(2)nm,b=1.0533(2)nm,c=1.0765(2)nm,α=100.21(3)°,β=101.93(3)°,γ=118.47(3)°,V=0.9698(3)nm3,R1=0.0524.化合物(2)属单斜晶系,空间群为P21,晶胞参数a=1.1512(2)nm,b=1.3097(3)nm,c=1.7610(4)nm,β=101.40(3)°,V=2.6028(9)nm3,R=0.0428.结构分析表明,两种化合物中Mo8O264-阴离子均发生畸变,有机阳离子增大,Mo-O键键长缩短,阴离子畸变增大.

Synthesis and Crystal Structure of Organoammonium β-Octamolybdate

Two compounds of 4Mo8O26·2H2O (1) and 4Mo8O26·2H2O (2) have been synthesized from MoO3 and (CH3)3N or (C2H5)3N. Single crystal X ray analysis indicates that compound(1)belongs to triclinic system, space group P1, crystal cell parameter a=1.050 0(2) nm, b=1.053 3(2) nm, c=1.076 5(2) nm, α=100.21(3)°, β=101.93(3)°, γ=118.47(3)°; and compound (2) to monoclinic system, space group P21, crystal cell parameter a=1.151 2(2) nm, b=1.309 7(3) nm, c=1.761 0(4) nm, β=101.40(3)°, V=2.602 8(9) nm3, Z=2, DC=1.949 Mg/m3, R=0.042 8, Goof=0.987.