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

Deacon, Glen B., Junk, Peter C., and Urbatsch, Aron (2011) Divalent metal complexes (Ca, Sr, Ba, Yb) of the unsymmetrical 3-(2 '-thienyl)-5-(trifluoromethyl)pyrazolate ligand. Dalton Transactions, 40 (7). pp. 1601-1609.

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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.

Item ID: 29654
Item Type: Article (Research - C1)
ISSN: 1477-9226
Keywords: rare-earth-metal; x-ray structures; bearing eta(2)-pyrazolato ligands; f bond activation; alkaline-earth; pyrazolate complexes; aryloxo-lanthanoids; organoamido-lanthanoids; crystal-structures; structural-characterization
Funders: Australian Research Council (ARC)
Projects and Grants: ARC DP0984775
Date Deposited: 02 Oct 2013 10:34
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030202 f-Block Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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