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Abstract
Kinetic studies on the aquation of trans-[CoLCl2]+ and trans-[CoL(NO2)+](L = tetra-aza macrocycle) complexes show large variation in rates. The dependence of aquation rates on conformational strain energy is true only for a limited number of compounds. The rate enhancements can be rationalised in terms of the ability of the macrocycle to fold across a fold axis. The large-ringed macrocyclic complexes trans-[CoL6Cl2]+(L6= 1,4,8,11 -tetra-azacyclohexadecane) and trans-[CoL7Cl2]+(L7= 1,4,8,11 -tetra-azacycloheptadecane) aquate at much lower rates due to curtailed folding ability. The N ⋯ N bite distances also suggest a lower aquation rate for these complexes. The complexes of 2,5,5,7,9,12,12,14-octamethyl- and 5,7,12,14-tetraethyl-5,12-dimethyl-1,4,8,11 -tetra-azacyclotetradecane aquate with low rates lying in a narrow range. No specific trends can be identified in these complexes. These studies also show that very large aquation rate enhancements in cobalt (III) complexes of 14-membered macrocycles are possible only if gem-dialkyl groups are present.
Published Version
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Schedule a callMore From: Journal of the Chemical Society, Dalton Transactions
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