Issue 7, 2011

Divalent metal complexes (Ca, Sr, Ba, Yb) of the unsymmetrical 3-(2′-thienyl)-5-(trifluoromethyl)pyrazolate ligand

Abstract

The divalent complexes [M(ttfpz)2(thf)4] (ttfpz = 3-(2′-thienyl)-5-(trifluoromethyl)pyrazolate; M = Yb, 1, Ca, 2, Sr, 3, Ba, 4; thf = tetrahydrofuran) and [M(ttfpz)2(dme)n] (M = Ca, 5, Sr, 6, Yb, 7, n = 2; M = Ba, 8, n = 3; dme = 1,2-dimethoxyethane) have been prepared by redox transmetallation/protolysis reactions employing the free metals, Hg(C6F5)2 and ttfpzH in donor solvents and their structures determined. The monomeric structures exhibit η2-bound pyrazolate ligands with eight-coordinate metal atoms for complexes 1–7 and a ten-coordinate metal for 8. The pyrazolate ligands in the thf-complexes 1–4 as well as dme-derivatives 5 and 6 are in a transoid configuration, whilst in complex 7 the ttfpz ligands exhibit a cisoid relationship. In 8 the ligands have an intermediate role in between cisoid and transoid.

Graphical abstract: Divalent metal complexes (Ca, Sr, Ba, Yb) of the unsymmetrical 3-(2′-thienyl)-5-(trifluoromethyl)pyrazolate ligand

Supplementary files

Article information

Article type
Paper
Submitted
27 Sep 2010
Accepted
08 Dec 2010
First published
07 Jan 2011

Dalton Trans., 2011,40, 1601-1609

Divalent metal complexes (Ca, Sr, Ba, Yb) of the unsymmetrical 3-(2′-thienyl)-5-(trifluoromethyl)pyrazolate ligand

G. B. Deacon, P. C. Junk and A. Urbatsch, Dalton Trans., 2011, 40, 1601 DOI: 10.1039/C0DT01289K

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