The ligand-exchange kinetics between the enantiomers of [Cu(alamp)] or
[Cu(promp)] and (S)-pdta are measured by CD spectroscopy; three
different reaction intermediates are proposed, involving the three
different states of N-protonation of pdta; at pH < 7 an associative
mechanism involving a cage-like, hydrogen-bonded intermediate is suggested
for [Cu(alamp)] in which the metal ion is transferred in a single rate
limiting step from one ligand to the other.
通过 CD 光谱测定了[Cu(alamp)]或[Cu(promp)]的对映体与 (S)-pdta 之间的
配体交换动力学;提出了三种不同的反应中间体,涉及 pdta N-质子化的三种不同状态;在 pH < 7 时,提出了[Cu(alamp)]涉及笼状氢键中间体的关联机制,其中金属离子在一个单一的限制速率步骤中从一个配体转移到另一个
配体。