Conformational characterization of square planar nickel(II) tetraaza macrocyclic complexes by proton NMR. Crystal structure of [Ni(13aneN4)]ZnCl4
作者： E. Joseph Billo , Peter J. Connolly , Dennis J. Sardella , Jerry P. Jasinski , Ray J. Butcher
DOI: 10.1016/0020-1693(94)04204-9
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摘要: Abstract Conformations in solution of several diamagnetic nickel(II) complexes macrocyclic tetraaza ligands are elucidated using proton NMR. There six possible configurational isomers planar [Ni(13aneN4)]2+ (13aneN4 = 1,4,7,10-tetraazacyclotridecane due to the orientation NH protons above or below plane macrocyle. Using NMR it is shown that aqueous complex has R,S,R,S trans-II configuration. A single-crystal X-ray study demonstrates same configuration nitrogen atoms [Ni(13aneN4)]ZnCl4. In case 14-membered ring macrocyle cyclam (cyclam 1,4,8,11-tetraazacyclotetradecane), previous studies revealed presence, solution, previously unobserved trans-I isomer, whose spectrum examined greater detail here. Solution structures bicyclam (1,5,8,12-tetraazabicyclo[10.2.2]hexadecane) and dachden (N, N′-bis(2-aminoethyl)-1,4-diazacycloheptane) also reported.
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