A series of dimethyltitanium compounds [CpTi(EAr)Me2]
(E = O, S) ligated by one cyclopentadienyl (Cp) and one aryloxide (OAr) or arylsulfide (SAr) have been structurally characterized in order to gain a better understanding of aryloxide and arylsulfide bonding in these systems. Experimental structures were compared to those predicted by density functional theory (DFT). Bonding in the arylsulfide systems was found to be significantly different from bonding in the aryloxide systems. The aryloxide ligands exhibited wide Ti–O–Ar angles (≥150°) with the Ar group oriented proximal to the Cp group. DFT computations revealed two conformers for the arylsulfide systems. Arylsulfides with the Ar group proximal to the Cp group had a predicted Ti–S–Ar angle of ∼120° while those with the Ar group distal to the Cp group had a measured and predicted Ti–S–Ar angle of ∼100°. Molecular and natural bond orbital (NBO) analyses were employed to explain the nature of ligand bonding in these systems.
系列二甲基
钛化合物[CpTi(EAr)Me2]
为了更好地理解这些系统中的芳氧基和芳基
硫键,对由一个
环戊二烯基 (Cp) 和一个芳氧基 (OAr) 或芳基
硫醚 (
SAr) 连接的 (E = O, S) 进行了结构表征。将实验结构与密度泛函理论 (DFT) 预测的结构进行比较。发现芳
硫醚体系中的键合与芳氧基醚体系中的键合显着不同。芳氧基
配体表现出宽的 Ti-O-Ar 角度(≥150°),Ar 基团靠近 Cp 基团。 DFT 计算揭示了芳
硫醚系统的两种构象异构体。 Ar 基团靠近 Cp 基团的芳基
硫醚的预测 Ti-S-Ar 角约为 120°,而 Ar 基团远离 Cp 基团的芳基
硫醚的测量和预测 Ti-S-Ar 角约为 100°。采用分子和自然键轨道(NBO)分析来解释这些系统中
配体键合的性质。