Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-Ku, Saitama 338-8570, Japan.
Molecules. 2023 Mar 12;28(6):2573. doi: 10.3390/molecules28062573.
Trichloro niobium(V) complexes and with the sulfur- or selenium-bridged [OEO]-type bis(phenolate) ligands (E = S, Se) were synthesized and fully characterized on the basis of their NMR spectroscopic data and X-ray crystallographic analysis. In the crystalline state of , the [OSeO]-core of the ligand was coordinated to the niobium center in a -fashion. The corresponding tribenzyl niobium(V) complexes and were also prepared by the reactions of and with 3 equivalents of PhCHMgCl in toluene. The X-ray diffraction analysis of revealed that the distorted six-coordinated niobium center incorporated in the [OSeO]-type ligand took a -fashion, and one benzyl ligand was coordinated to the niobium center by -fashion. Complexes and were tested for the phenylacetylene polymerization that produced poly(phenylacetylene)s (PPAs), oligomers, and triphenylbenzenes (TPBs) depending on the chalcogen atom in the [OEO]-type ligand.
三氯铌(V)配合物 和带有硫或硒桥连 [OEO]-型双（酚）配体（E = S，Se）的配合物是基于它们的 NMR 光谱数据和 X 射线晶体学分析合成并进行了充分表征的。在 的晶体状态下，配体的 [OSeO]-核以 -方式与铌中心配位。通过在甲苯中用 3 当量的 PhCHMgCl 与 和 反应，也制备了相应的三苄基铌(V)配合物 和 。的 X 射线衍射分析表明，在 [OSeO]-型配体中纳入的扭曲六配位铌中心采取 -方式，并且一个苄基配体通过 -方式与铌中心配位。根据 [OEO]-型配体中的硫原子，配合物 和 被测试用于苯乙炔聚合，产生聚（苯乙炔）（PPA）、低聚物和三苯基苯（TPB）。
