Expanding the series of [RE₂Ca(OQ)₈] structures: new heterobimetallic rare earth/alkaline earth 8-quinolinolate complexes

Deacon, Glen B.;Junk, Peter C.;Leary, Stuart G.;Urbatsch, Aron

Abstract

A series of heterobimetallic complexes [RE₂Ca(OQ)₈]·nHOQ(RE = Sm, Gd, Tb, Ho, Tm, Yb, Lu, Y, Sc) and the isostructural [Gd₂Mg(OQ)₈] were synthesised and structurally characterised. They were mainly obtained after direct reactions of the elemental rare earth metals with calcium metal in the presence of 8-hydroxyquinoline (HOQ) and a 1, 3, 5-tri-tert-butyl-benzene (tBuB) flux, and some complexes were synthesised by pseudo solid-state rearrangement reactions between powdered RE(OQ)₃ and AE(OQ)₂ (AE = Mg, Ca) in a 1, 2, 4, 5-tetramethylbenzene (TMB) flux, at elevated temperatures. The linear trinuclear [RE₂Ca(OQ)₈] moieties show a six-coordinate central calcium atom flanked by two eight-coordinate rare earth atoms surrounded by six chelating-bridging OQ and two terminal chelating OQ ligands. The structurally novel [Sc₂Ca(OQ)₈] has a bent Sc-Ca-Sc backbone and exhibits an eight-coordinate central calcium and two seven-coordinate scandium ions.

Journal

Zeitschrift fuer Anorganische und Allgemeine Chemie

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Volume

638

ISBN/ISSN

1521-3749

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Issue

12-13

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Publisher

Wiley-Blackwell

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DOI

10.1002/zaac.201200138