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Complexes of 6-methyl-2-pyridone with the alkaline earth metals magnesium, strontium and barium: Synthesis and structural characterisation

Lookup NU author(s): Gary Nichol, Emeritus Professor Bill Clegg

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Abstract

Reaction in dry methanol of 6-methylpyridine (Hmhp) with M(OR)2 (M = Mg, Sr, Ba) formed three new coordination compounds, with very different crystal structures. Compound [Mg4(mhp)4(MeO)4(MeOH)8] (1) forms discrete clusters containing a rare Mg4O4 cubane, only the tenth reported occurrence of such a motif. Compounds [Sr(mhp)2(Hmhp)] (2) and [Ba(mhp)2(Hmhp)(MeOH)] (3) are both eight-coordinate complexes in polymeric chains. The solvent-free 2 packs as an infinite left-handed helix with elegant sixfold screw symmetry formed as a result of twisting necessary for coordination to Sr2+ by both deprotonated nitrogen atoms. In 3 there is also a molecule of methanol coordinated to Ba2+; there is now no need for a twist to achieve the extra coordination, and so the compound forms instead a straight chain with glide-plane symmetry. © 2006 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Nichol GS, Clegg W

Publication type: Article

Publication status: Published

Journal: Inorganica Chimica Acta

Year: 2006

Volume: 359

Issue: 11

Pages: 3474-3480

ISSN (print): 0020-1693

ISSN (electronic): 1873-3255

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.ica.2006.01.005

DOI: 10.1016/j.ica.2006.01.005


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