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Structures of Nickel(II) and Copper(II) Complexes of 14‐Membered Macrocyclic Quadridentate Ligands
Author(s) -
Lu TianHuey,
Chung ChungSun,
Ashida Tamaichi
Publication year - 1991
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199100024
Subject(s) - chemistry , macrocyclic ligand , nickel , crystallography , metal , hydrogen bond , ligand (biochemistry) , coordination number , copper , bond length , coordination sphere , ion , stereochemistry , molecule , crystal structure , organic chemistry , biochemistry , receptor
The structures of 41 Ni(II) and 17 Cu(II) complexes of macrocyclic quadridentate ligands have been analyzed, and are discussed about bond lengths, bond angles, conformations, and configurations, upon which many conclusions are formed. The inter‐ or intra‐molecular hydrogen bonds exist among ligands and hydrates in many compounds and play an important role in the structures. There are exhibited two distinct peaks on the histogram of the average Ni‐N distances, corresponding to four coordination and six coordination; these average Ni‐N distances are 1.95(4) Å and 2.10(5) Å, respectively. The most probable structures of Ni(II) macrocyclic compounds have coordination number six for the metal ion, chair forms for six‐membered rings, planar structure for the metal ion and the four donor atoms of the quadridentate ligand and an inversion center at the central metal ion.