ISSN:
0009-2940
Keywords:
2,11-Diaza[3,3](2,6)pyridinophane
;
N,N′-dimethyl-
;
Tetraazamacrocyclic complexes
;
cis-Octahedral coordination geometry
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The properties of the tetraazamacrocyclic compound N,N′-dimethyl-2,11-diaza[3,3](2,6)pyridinophane (L-N4Me2) as a ligand for some selected metal chlorides have been examined. The crystal structure of the uncoordinated ligand reveals a syn chair-chair conformation. In solution, the ligand displays fluctional behavior. Reaction of L-N4Me2 with the chlorides of copper(II), nickel(II), and cobalt(II) affords the complexes [Cu(L-N4Me2)Cl2] · H2O (3), [Ni(L-N4Me2)(H2O)Cl]Cl · H2O (4), and [Co(L-N4Me2)Cl2] · 2 H2O (5) in which the ligand adopts a syn boat-boat conformation. The crystal structures of 4 and 5 are presented. Due to the small cavity of the 12-membered ring of the ligand, exclusively distorted cis-octahedral coordination geometries are found at the metal sites. A comparison of structural data of several complexes with this ligand shows that the extent of the distortions from ideal octahedral geometry is mainly determined by the M-Npy bond strength. The electronic as well as the solution properties of the described complexes have been investigated by electronic absorption spectroscopy. ESR spectroscopy, and electrochemical methods.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19951280602
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