Steric Crowding in Coordination Compounds: Electron-transfer kinetics of the [Co(tmen)3]3+/2+ couple (tmen = 2,3-dimethylbutane-2,3-diamine)
作者:Philip Hendry、Andreas Ludi
DOI:10.1002/hlca.19880710814
日期:1988.12.14
The [Co(tmen)3]3+ complex ion (tmen = 2,3-dimethylbutane-2,3-diamine) has been synthesized and its redox characteristics compared to those of its parent ion [Co(en)3]3+. The 12 peripheral Me groups significantly affect the properties of the [Co(tmen)3]3+ ion. The ligand-field bands are shifted to lower energies by about 1700 cm−1 compared to [Co(en)3]3+. The reduction potential for [Co(tmen)3]3+ is
已经合成了[Co(tmen)3 ] 3+络合物离子(tmen = 2,3-二甲基丁烷-2,3-二胺),并且与它的母离子[Co(en)3 ] 3+相比,它的氧化还原特性。12个外围Me基团显着影响[Co(tmen)3 ] 3+离子的性质。与[Co(en)3 ] 3+相比,配体场带移动了大约1700 cm -1的较低能量。[Co(tmen)3 ] 3+的还原电位为+0.28 V(vs. NHE),而[Co(en)3 ] 3+的还原电位为-0.18 V。[Co(tmen)3 ] 3 + / 2 +对的自交换反应速率k = 8.5×10 -8 M -1 ·S -1是通过与还原剂进行马库斯交叉关系确定的Cr 2 +,V 2 +,Eu 2 +,Ru 2+和[Co(硫化物)] 2+。