2,6-Diphenylphenolates of calcium, strontium and barium exhibiting π-phenyl encapsulation of the partially naked cations

Deacon, Glen B., Forsyth, Craig M., and Junk, Peter C. (2000) 2,6-Diphenylphenolates of calcium, strontium and barium exhibiting π-phenyl encapsulation of the partially naked cations. Journal of Organometallic Chemistry, 607 (1-2). pp. 112-119.

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Abstract

Solvent free 2,6-diphenylphenolates of calcium, strontium and barium have been prepared by direct reaction of the bulk metals with 2,6-diphenylphenol (HOdpp) at elevated temperatures in evacuated sealed tubes. Single-crystal X-ray diffraction studies of crystalline [Ca₂(Odpp)₂(μ-Odpp)₂]·(PhMe) (1), [Sr₂(Odpp)(μ-Odpp)₃]·(PhMe) (2) or [Ba₂(Odpp)(μ-Odpp)₃] (3), obtained by toluene extraction of the reaction mixtures, revealed different binuclear structural frameworks. In 1, both Ca atoms have one terminal and two bridging aryloxide ligands in a pyramidal array with the coordination vacancies occupied by π-bonded pendant phenyl groups (an η³- and an η¹-Ph on one Ca and an η⁶-Ph on the other). By contrast, 2 has unsymmetrical metal–oxygen coordination with one terminal and three bridging aryloxides attached to one metal and solely three bridging aryloxides bound to the other. There are additional intramolecular π-Ph–Sr interactions with three η¹-Ph groups on the four coordinate Sr and three η²-Ph groups on the three coordinate Sr. In 3, the structure exhibits a similar metal–oxygen framework to 2, but there are an increased number of π-phenyl–M interactions (one η²-Ph and two η¹-Ph on the four coordinate Ba and one η⁶-Ph, one η³-Ph and one η²-Ph on the three coordinate Ba).

Item ID: 12925
Item Type: Article (Refereed Research - C1)
Keywords: π-phenyl complexes; calcium; strontium; barium; aryloxides
ISSN: 1872-8561
Date Deposited: 19 Jul 2012 02:02
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030204 Main Group Metal Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
Citation Count from Web of Science Web of Science 42
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