Ring-size and substituent effects in relatively rigid macrocyclic quinquedentate ligands. Structure determinations of {ZnL4(H2O)2}{ClO4}2·MeCN and {ZnL3(ClO4)2}. - Liles, David C.; McPartlin, Mary; Tasker, Peter A. (Journal of the Chemical Society, Dalton Transactions, 1987)