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Expanding the Series of [RE 2 Ca(OQ) 8 ] Structures: New Heterobimetallic Rare Earth/Alkaline Earth 8‐Quinolinolate Complexes
Author(s) -
Deacon Glen B.,
Junk Peter C.,
Leary Stuart G.,
Urbatsch Aron
Publication year - 2012
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201200138
Subject(s) - chemistry , isostructural , alkaline earth metal , scandium , crystallography , rare earth , calcium , metal , inorganic chemistry , stereochemistry , mineralogy , crystal structure , organic chemistry
Abstract. A series of heterobimetallic complexes [RE 2 Ca(OQ) 8 ] · n HOQ(RE = Sm, Gd, Tb, Ho, Tm, Yb, Lu, Y, Sc) and the isostructural [Gd 2 Mg(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 ( t BuB) 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 [RE 2 Ca(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 [Sc 2 Ca(OQ) 8 ] has a bent Sc‐Ca‐Sc backbone and exhibits an eight‐coordinate central calcium and two seven‐coordinate scandium ions.