New organohalogermanes RGe(OCH2CH2NMe2)2X (R = Ph, X = I (5); R = Me, X = Cl (6) or I (7)) with an intramolecular N→Ge coordination bond were synthesized. According to the 1H and 13C NMR spectroscopic data, iodides 5 and 7 exist in solution as ionic compounds with the pentacoordinated germanium atom. In solution of compound 4 (R = Ph, X = Cl), there is an equilibrium between the ionic and covalent forms. The equilibrium shifts toward the ionic form with increasing solvent polarity or temperature. In solution, chloride 6 is a covalent compound. The structures and relative stabilities of different isomers of compounds 4–7 were studied by quantum chemical calculations at the density functional level of theory.
合成了具有分子内 N→Ge 配位键的新型有机卤化
锗 RGe(OCH2CH2NMe2)2X (R = Ph,X = I (5);R = Me,X = Cl (6) 或 I (7))。根据 1H 和 13C NMR 光谱数据,
碘化物 5 和 7 在溶液中以五配位
锗原子的离子化合物形式存在。在化合物 4(R = Ph,X = Cl)的溶液中,离子形式和共价形式达到平衡。随着溶剂极性或温度的增加,平衡会向离子形式转移。在溶液中,
氯化物 6 是一种共价化合物。通过密度泛函理论量子
化学计算,研究了化合物 4-7 不同异构体的结构和相对稳定性。