into the corresponding dicarboxylatotetraorganodistannoxanes. All complexes were characterized by elemental analyses, IR and multinuclear magnetic resonance (1H, 13C and 119Sn) data. The crystal structure of [Et2Sn(O2CC4H3S)2] shows the Sn atom to exist in a skew-trapezoidal planar geometry defined by two asymmetrically coordinating carboxylate ligands (Sn–O 2.143(5), 2.556(5); 2.129(5), 2.473(5) Å)
二
有机锡氧化物与2-
噻吩或2-
呋喃羧酸的
化学计量比为1:2的反应生成[R 2 Sn(O 2 CC 4 H 3 E)2 ]类型的络合物(I)(R = Me,Et ,n Pr,n Bu; E = O或S)。用R 2 SnCl 2处理这些配合物得到
氯配合物,[R 2 Sn(Cl)(O 2 CC 4 H 3 E)](II)(R = Me,n Bu,E = S; R = n PR,ñBu,E = O)。
水解时,将I型复合物转化为相应的二羧基四有机二
锡锡烷。所有复合物的特征在于元素分析,红外光谱和多核磁共振(1 H,13 C和119 Sn)数据。[Et 2 Sn(O 2 CC 4 H 3 S)2的晶体结构]显示Sn原子存在于由两个不对称配位的
羧酸盐
配体(Sn–O 2.143(5),2.556(5); 2.129(5),2.473(5)Å)和两个乙基定义的斜梯形平面几何结构中(Sn–C 2.110(9),2