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Homo- and Heterometallic Mono-, Di-, and Trinuclear Co2+, Ni2+, Cu2+, and Zn2+ Complexes of the 'Heteroscorpionate' Ligand (2-Hydroxyphenyl)bis(pyrazolyl)methane and Its Derivatives

Authors :
Norman S. Dean
Timothy C. Higgs
Carl J. Carrano
Source :
Inorganic Chemistry. 37:1473-1482
Publication Year :
1998
Publisher :
American Chemical Society (ACS), 1998.

Abstract

1H NMR spectra on the paramagnetic CoII and NiII, ML2 “sandwich” complexes of the “heteroscorpionate” ligands (2-hydroxyphenyl)bis (pyrazolyl)methane and its derivatives revealed the presence of isomeric, cis ↔ trans equilibria of these complexes in solution. The presence of some of the cis isomer in solution at equilibrium has been exploited to synthesize new heterometallic trinuclear species of the type [M1(L1O)2M2(L1O)2M1][BF4], where M1 (octahedral) and M2 (tetrahedral) are Zn2+, Cu2+, Ni2+, and Co2+. Rearrangements during the synthesis of some of these heterometallic species provided an interesting experimental confirmation of the site preferences (octahedral vs tetrahedral) for the first-row transition metals as predicted on the basis of crystal field stabilization energies. X-ray crystallographic characterization of many of the complexes reported in this study gives the following structural parameters: [Co2(L2O)2Cl2]·MeCN, C36H41N9Cl2Co2O2, monoclinic, a = 10.742(1) A, b = 21.387(2) A, c = 16.890(...

Details

ISSN :
1520510X and 00201669
Volume :
37
Database :
OpenAIRE
Journal :
Inorganic Chemistry
Accession number :
edsair.doi...........f049d65ec74e28f3a4be58a80a8a0d37