Neutral oxorhenium(V) complexes with tridentate SNO Schiff bases have been prepared by substitution reactions on the square pyramidal ionic complex [NBu4][ReVOCl4] and on the six-coordinate rhenium precursor [ReVOCl3(PPh3)2]. The chlororhenium intermediate species [ReVOCl(Ph–SNO–CH3)] 1 allows the formation of the homologous iodo complex [ReVOI(Ph–SNO–CH3)] 2 by a halogen exchange reaction with lithium iodide. The similar complexes [ReVOCl(Ph–SNO–H)] 3 and [ReVOCl(Naph–SNO–H)] 4 have been synthesised using S-methyl-β-N-(2-hydroxyphenylmethylidene)dithiocarbazate
(Ph–SNO–H) and S-methyl-β-N-(2-hydroxynaphthylmethylidene)dithiocarbazate (Naph–SNO–H). The ionic complex [NBu4][ReOCl4] reacts with 4 equivalents of PPh3 and Ph–SNO–H or Naph–SNO–H to give rise to the complexes [ReVOCl(Ph–SNO–H)(PPh3)] 5 and [ReVOCl(Naph–SNO–H)(PPh3)] 7 which are smoothly converted in ethanolic solution into [ReVOCl(Ph–SNO–H)(OPPh3)] 6 and [ReVOCl(Naph–SNO–H)(OPPh3)] 8, respectively. Each compound was characterised by elemental analysis, IR, NMR spectra and FAB mass spectrometry. The crystallographic structures of [ReOI(Ph–SNO–CH3)] 2, [ReOCl(Ph–SNO–H)(PPh3)] 5 and [ReOCl(Ph–SNO–H)(OPPh3)] 6 were determined by single crystal X-ray diffraction methods.
通过对方形
金字塔离子络合物 [NBu4][ReVOCl4] 和六配位
铼前体 [ReVOCl3(PPh3)2] 的取代反应,制备出了具有三叉 SNO 席夫碱的中性羰基
铼(V)络合物。
氯钌中间体[ReVOCl(Ph-SNO-
CH3)]1 与
碘化
锂发生卤素交换反应,生成同源的
碘络合物[ReVOI(Ph-SNO- )]2。利用 S-甲基-β-N-(2-羟基苯基亚甲基)二
硫代卡巴
肼(Ph-SNO-H)和 S-甲基-β-N-(2-羟基
萘亚甲基)二
硫代卡巴
肼(Naph-SNO-H)合成了类似的络合物 [ReVOCl(Ph-SNO-H)] 3 和 [ReVOCl(Naph-SNO-H)] 4。离子络合物 [NBu4][ReOCl4] 与 4 个等量的 PPh3 和 Ph-SNO-H 或 Naph-SNO-H 反应,生成络合物 [ReVOCl(Ph-SNO-H)(PPh3)] 5 和 [ReVOCl(Naph-SNO-H)(PPh3)] 6。和[ReVOCl(Naph-SNO-H)(PPh3)]7,它们在
乙醇溶液中可顺利转化为[ReVOCl(Ph-SNO-H)(
OPPh3)]6 和[ReVOCl(Naph-SNO-H)(
OPPh3)]8、和 [ReVOCl(Naph-SNO-H)(
OPPh3)] 8。每个化合物都通过元素分析、红外光谱、核磁共振光谱和 FAB 质谱进行了表征。单晶 X 射线衍射法测定了[ReOI(Ph-SNO- )] 2、[ReOCl(Ph-SNO-H)(PPh3)] 5 和[ReOCl(Ph-SNO-H)(
OPPh3)] 6 的晶体结构。