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Updated: Jul 5, 2026

Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
Three overcrowded zinc(II) complexes with potentially hexadentate polypyridyl ligands
Alan Hazell1, Ole Mønsted, Jens Christian Rasmussen
1Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Arhus C, Denmark. ach@chem.au.dk
Abstract:
In each of [N,N,N',N'-tetrakis(2-pyridylmethyl)ethane-1,2-diamine-kappa(6)N]zinc(II) bis(perchlorate) 0.67-hydrate, [Zn(C(26)H(28)N(6))](ClO(4))(2) x 0.67 H(2)O, (I), [N,N,N'-tris(2-pyridylmethyl)-N'-(2-quinolylmethyl)ethane-1,2-diamine-kappa(6)N]zinc(II) bis(perchlorate), [Zn(C(30)H(30)N(6))](ClO(4))(2), (II), and [N,N'-bis(2-pyridylmethyl)-N,N'-bis(2-quinolylmethyl)ethane-1,2-diamine-kappa(6)N]zinc(II) bis(perchlorate) monohydrate, [Zn(C(34)H(32)N(6))](ClO(4))(2) x H(2)O, (III), the Zn atom is coordinated to all six N atoms of the ligand. Compound (I) has one complex cation in a general position and one on a twofold axis. The coordination environments are intermediate between a regular octahedron and a pentagonal bipyramid which lacks one equatorial bond; complexes (II) and (III) are shown to be closer to the latter description. The quinolyl groups are in equatorial positions and the deviation from octahedral geometry increases with the number of these groups. This study demonstrates the systematic changes in the geometry at the central Zn atom as the overlap between the ligands increases.
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