Isolation, structural and spectroscopic investigations of complexes with tridentate [O,P,O] and [O,O,O] donor ligands
作者:Rolf Siefert、Thomas Weyhermüller、Phalguni Chaudhuri
DOI:10.1039/b005693f
日期:——
A phosphorus-containing potentially tridentate ligand bis(3,5-di-tert-butyl-2-hydroxyphenyl)phenylphosphine H2L, 1, was prepared. 1 reacts directly in solution with aerial oxygen or hydrogen peroxide to form bis(3,5-di-tert-butyl-2-hydroxyphenyl)phenylphosphine oxide H2LO, 2. It yields complexes [NiII(HL)2] 3, [CoIII(OH2)(HL)(L)] 4, [RhIIICl(H2L)(L)] 5, and [RhIII(HL)(L)(H2O)] 6 characterized by various physical techniques, including IR, MS, UV-vis, 1H and 31P-1H} NMR and electrochemical methods. The crystal structures of 3, 4 and 5 show tridentate [O,P,O] and bidentate [O,P,OH] coordination of deprotonated 1 and the coordination geometry of the metal centre. The structure of 2 reveals strong hydrogen bonding between the phenolic hydroxyl groups and the OP group in the solid state. That the ligand 2 produces a weak ligand field providing tridentate [O,O,O] coordination sites has been evidenced by the structure and paramagnetism of [CoII2(LO)2(C2H5OH)3] 7.
一种含有磷的潜在三齿配体双(3,5-二叔丁基-2-羟基苯基)苯基膦H2L, 1, 被制备出来。1可以直接在溶液中与空气中的氧气或过氧化氢反应, 生成双(3,5-二叔丁基-2-羟基苯基)苯基膦氧化物H2LO, 2。2生成了一系列配合物[NiII(HL)2] 3, [CoIII(OH2)(HL)(L)] 4, [RhIIICl(H2L)(L)] 5, 和[RhIII(HL)(L)(H2O)] 6,这些配合物通过包括红外光谱、质谱、紫外-可见光谱、1H核磁共振和31P-1H}核磁共振以及电化学方法在内的多种物理技术进行了表征。配合物3、4和5的晶体结构显示去质子的1通过三齿[O,P,O]和双齿[O,P,OH]进行配位, 并展示了金属中心的配位几何结构。化合物2的结构揭示了在固态下苯酚羟基与OP基团之间存在强烈的氢键相互作用。配合物[CoII2(LO)2(C2H5OH)3] 7的结构和顺磁性证明了配体2产生了一个弱的配位场, 提供了三齿[O,O,O]配位位点。