Rationalizing oligomerization in dimethylindium(iii) chalcogenolates (Me2InER′) (E = O, S, Se): A structural and computational study
作者:Glen G. Briand、Andreas Decken、Nathan S. Hamilton
DOI:10.1039/b927128g
日期:——
The effect on oligomerization of increased steric bulk in dimethylindium(III) chalcogenolates (Me2InERâ²) (E = O, S, Se) has been examined. The facile reaction of Me3In with a series of phenols, thiophenols and selenophenols afforded the compounds [Me2InO(C6H5)]2 (1), [Me2InO(2,6-Me2C6H3)]2 (2), Me2InO(2,4,6-tBu3C6H3) (3), [Me2InS(C6H5)]â (4), [Me2InS(2,4,6-tBu3C6H3)]â (6), [Me2InSe(C6H5)]2 (7), [Me2InSe(2,4,6-Me3C6H3)]â (8) and [Me2InSe(2,4,6-tBu3C6H3)]â (9). All compounds have been characterized by elemental analysis, melting point, FT-IR, FT-Raman, solution NMR, and X-ray crystallography. The structures of 1â2 are dimeric via short intermolecular InâO interactions, yielding a symmetric In2O2 unit and a distorted tetrahedral C2O2 bonding environment for indium. Increasing steric bulk in 3 results in the isolation of a monomeric species, exhibiting a distorted trigonal planar C2O bonding environment for indium. In contrast to 1, the thiolate analogue 4 exhibits a polymeric structure viaμ2-SPh groups and a distorted tetrahedral C2S2 bonding environment for indium. Increasing steric bulk resulted in the formation of a chain of weakly coordinated monomers via intermolecular Inâ¯S interactions in [Me2InS(2,4,6-tBu3C6H2)]â (6). Although 7 shows a dimeric species similar to 1, the 2,4,6-trimethyl substituted selenolate analogue 8 exhibits a polymeric structure, while the âSe-2,4,6-tBu3C6H3 analogue (9) showing a similar structure to 6. Comparison to previously reported structures of diorganoindium chalcogenolates demonstrates the importance of the methyl substituents on indium in facilitating the isolation of higher (non-dimeric) oligomers. Theoretical calculations demonstrate the significance of altering the R and Râ² groups and E on the degree of oligomerization in [R2InERâ²]n species.
研究了二甲基
铟(III)
硫属醇盐(Me2InER-) (E = O、S、Se)中增加的空间体积对低聚的影响。 Me3In 与一系列
酚类、
硫酚类和
硒代
酚类容易反应,得到化合物 [Me2InO(
C6H5)]2 (1)、[Me2InO(2,6-Me2C6H3)]2 (2)、Me2InO(2,4,6) -tBu3C6H3) (3)、[Me2InS( )] — (4)、[Me2InS(2,4,6-tBu3C6H3)] — (6)、[Me2InSe( )]2 (7)、 [Me2InSe(2,4,6-Me3C6H3)] — (8) 和 [Me2InSe(2,4,6-tBu3C6H3)] — (9)。所有化合物均通过元素分析、熔点、FT-IR、FT-Raman、溶液 NMR 和 X 射线晶体学进行了表征。 1–2 的结构通过短分子间 In–O 相互作用形成二聚体,产生对称的 In2O2 单元和扭曲的四面体
C2O2 铟键合环境。 3 中空间体积的增加导致单体物质的分离,表现出
铟的扭曲的三角平面
C2O 键合环境。与 1 相比,
硫醇类似物 4 通过 π2-
SPh 基团和扭曲的四面体 C2S2
铟键合环境表现出聚合结构。增加空间体积导致通过 [Me2InS(2,4,6-tBu3C6H2)] 中的分子间 In−S 相互作用形成弱配位单体链 (6)。虽然 7 显示出与 1 类似的二聚体,但 2,4,6-三甲基取代的
硒酸盐类似物 8 显示出聚合结构,而 αSe-2,4,6-tBu3C6H3 类似物 (9) 显示出与 1 类似的结构。 6. 与先前报道的
硫属醇二有机
铟结构的比较表明,
铟上的甲基取代基在促进高级(非二聚体)低聚物的分离方面的重要性。理论计算证明了改变 R 和 R– 基团以及 E 对 [R2InER–]n 物质寡聚程度的重要性。