Cyclometalated Diruthenium Complexes Bridged by 3,3′,5,5′‐Tetra(pyrid‐2‐yl)biphenyl: Tuning of Electronic Properties and Intervalence Charge Transfer by Terminal Ligand Effects
作者:Wen‐Wen Yang、Jiang‐Yang Shao、Yu‐Wu Zhong
DOI:10.1002/ejic.201500498
日期:2015.7
splitting ranging from 150 (for 5(2+)) to 280 mV (for 6(2+)). The mixed-valent states of these complexes have been generated by stepwise electrolysis. The symmetric complexes show intervalence charge transfer (IVCT) transitions at similar energy (E-op approximate to 5750 cm(-1)), with the electronic coupling parameter V-ab of 1240, 1220, and 970 cm(-1) for 1(3+), 3(3+), and 5(3+), respectively. The nonsymmetric
制备了6个由3,3,5,5-四(吡啶-2-基)联苯桥接的环金属化二钌配合物,其中1(2+)、3(2+)和5(2+)为对称配合物具有不同的末端配体 [2,6-双(N-甲基苯并咪唑基)吡啶 (Mebip), 4-tolyl-2,2:6,2-terpyridine (ttpy), and trimethyl-4,4,4-tricarboxylate-2, 2:6,2-三联吡啶(分别为 Me(3)tctpy)]。其他三种具有混合终端配体的复合物(Mebip-Me(3)tctpy 用于 6(2+);Mebip-ttpy 用于 7(2+);ttpy-Me(3)tctpy 用于 8(2+))在结构上是非对称的。这些配合物显示出两个连续的 Ru(III/II) 氧化还原对,介于 0.20 和 0.90 V 与 Ag/AgCl 之间,电位分裂范围从 150(对于 5(2+))到 280 mV(对于 6(2+))