Chelate ring sequence effects on thermodynamic, kinetic and electron-transfer properties of copper(ii/i) systems involving macrocyclic ligands with S4 and NS3 donor setsElectronic supplementary information (ESI) available: Tables S1–14: tabulations of experimental rate constants. See http://www.rsc.org/suppdata/dt/b3/b300602f/
作者:Semira Galijasevic、Ksenia Krylova、Michael J. Koenigbauer、Gregory S. Jaeger、Jeffery D. Bushendorf、Mary Jane Heeg、Leo A. Ochrymowycz、Michael J. Taschner、David B. Rorabacher
DOI:10.1039/b300602f
日期:2003.4.4
has the common chelate ring size sequence 5,6,5,6 while isomer b has the sequence 5,5,6,6. A crystal structure for [CuII([14]aneNS3-b)(H2O)](ClO4)2 demonstrates that, when coordinated to Cu(II), the b isomers stabilize the relatively rare ligand conformation designated as conformer II in which one donor atom is oriented opposite to the other three relative to the plane of the macrocycle. This eliminates
先前已将涉及几种铜(II / I)配合物的电子转移反应的动力学行为归因于双途径“方形方案”机制,其中配位几何结构的改变是随电子转移顺序发生的,而不是协调发生的。步。在迄今为止研究的14元大环四齿配体配合物的情况下,主要的几何变化似乎是在整个电子转移过程中两个配位供体原子的倒置。然而,这两个反演的相对重要性一直是猜测的问题。在目前的研究中,对涉及两对碳纳米管的Cu(II / I)系统进行了比较。配体具有S 4和NS 3供体组:1,4,8,11-四硫代环十四烷([14] aneS 4 - a);1,4,7,11-四硫代环十四烷([14] aneS 4 - b);1,4,8-trithia-11-氮杂环十四烷([14] aneNS 3 - a); 和1,7,11-三硫-4-氮杂环十四烷([14] aneNS 3 - b)。在每对配体,异构体a具有共同的螯合环大小序列5,6,5,6,而异构体b具有序列5