UNSPECIFIED. (2004) Metal-mediated pseudo coordination isomerism in complexes of mixed neutral didentate and dianionic tridentate pyridine-containing ligands. AUSTRALIAN JOURNAL OF CHEMISTRY, 57 (6). pp. 565-570. ISSN 0004-9425

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Abstract

Reaction of nickel(II) or copper(II) acetate with 2-(aminomethyl) pyridine 1 and pyridine-2,6-dicarboxylate ion 2 in aqueous methanol in a 1 : 1 : 1 molar ratio leads to the crystallization in high yield of exclusively one product in each case. For nickel(II), a neutral mixed-ligand complex [Ni . 1 . 2 . (OH2)] is obtained, whereas with copper(II) an ionic complex [Cu . 1(2) . (OHCH3)][Cu . 2(2)] forms wherein each complex ion contains exclusively one type of ligand. The outcome appears to be directed by the metal ion employed, the two forms being effectively coordination isomers, albeit differing in central metal ion. The neutral complex [Ni . 1 . 2 . (OH2)] . 4 1/4H(2)O crystallizes in the triclinic space group P (1) over bar, with two independent nickel centres and ten ( some with partial occupancy) water molecules in the asymmetric unit. Each nickel lies in a distorted octahedral environment, with the three N-donor and O-donor sets occupying meridional positions. A complex system of hydrogen bonding and pi-stacking operates in the crystal, with arrays of complex units arranged in 'dimer tapes' surrounded by water molecules. The ionic [Cu . 1(2) . (OHCH3)][Cu . 2(2)] . 2CH(3)OH complex crystallizes in the monoclinic P2(1)/c space group. The cation adopts a distorted square-based pyramidal geometry with a coordinated methanol in the axial position, although another is weakly interacting in the other axial site. The anion exists in the previously described octahedral geometry with two meridionally-disposed tridentate ligands with the pyridines disposed in trans positions. Three-dimensional ordering in the structure is directed by 'ribbons' of hydrogen bonding.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	AUSTRALIAN JOURNAL OF CHEMISTRY
Publisher:	C S I R O PUBLISHING
ISSN:	0004-9425
Date:	2004
Volume:	57
Number:	6
Number of Pages:	6
Page Range:	pp. 565-570
Identification Number:	10.1071/CH03244
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/8405

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