Base-catalysed aquation of αβ-syn- and αβ-anti-chloro- and bromo-[1,9-bis(2′-pyridyl)-2,5,8-triazanonane]- and -[1,11-bis(2′-pyridyl)-2,6,10-triazaundecane]-cobalt(<scp>III</scp>) cations. An unusually base-sensitive halogenopentamine cobalt(<scp>III</scp>) system
作者:Etmina Ahmed、Chinmay Chatterjee、Christopher J. Cooksey、Martin L. Tobe、Glyn Williams、Madalena Humanes
DOI:10.1039/dt9890000645
日期:——
Complexes of the type [Co(picdien)X][ClO4]2 and [Co(picditn)X][ClO4]2[picdien = 1,9-bis(2′-pyridyl)-2,5,8-triazanonane, picditn = 1,11-bis(2′-pyridyl)-2,6,10-triazaundecane; X = Cl, Br, NO2, NCS, N3, MeCO2, or H2O] have been prepared. All complexes have the αβ configuration, those of picdien existing in either or both syn and anti forms, while only the anti forms of the picditn complexes have been
[Co(picdien)X] [ClO 4 ] 2和[Co(picditn)X] [ClO 4 ] 2类型的配合物[picdien = 1,9-双(2'-吡啶基)-2,5,8-三氮唑烷,picditn = 1,11-双(2'-吡啶基)-2,6,10-三氮杂十一烷; 已经制备了X = Cl,Br,NO 2,NCS,N 3,MeCO 2或H 2 O]。所有复合物均具有αβ构型,picdien的存在形式为顺式和反式,也可同时存在,同时仅picditn复合物的反式已被分离。结构已经通过单晶X射线衍射和1在二甲亚砜和D 2 O中的H纳米光谱。所有配合物在很宽的pH值范围内对碱催化的水解反应异常敏感。仅在高温和高[H + ]时才观察到对pH依赖性的氯-和溴-picdien配合物的溶剂化作用,但对相应的picditn物种的溶剂化作用却具有非常重要的pH值依赖性。对碱催化也比较敏感。质子交换研究表明,即使