Intramolecular Hydrogen Bonding in Complexes Containing Bicyclic Guanidine Ligands

Oakley, Sarah H, Soria, Delia B, Coles, Martyn P and Hitchcock, Peter B (2006) Intramolecular Hydrogen Bonding in Complexes Containing Bicyclic Guanidine Ligands. Polyhedron, 25 (5). pp. 1247-1255. ISSN 0277-5387

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Abstract

A series of complexes with the general formula MX2(hppH)2 [hppH = 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine: 1, M = Mn, X = Cl; 2, M = Fe, X = Cl; 3, M = Ni, X = Cl; 4 M = Zn, X = Br] have been synthesized and structurally characterized. In all cases, the neutral guanidine ligand bonds through the imine nitrogen atom to a tetrahedral metal centre, with additional interaction between the secondary amino NH and the metal bound halide. The intramolecular hydrogen bonding gives two isomeric forms in the solid-state, referred to as ¿ and ¿, which co-crystallize in the unit cell. An example of intramolecular hydrogen bonding from the neutral hppH to oxygen within the dimeric core lithiated siloxide, [Ph3SiOLi(hppH)(THF)]2 (5), is also reported.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Martyn Coles
Date Deposited: 06 Feb 2012 21:24
Last Modified: 30 Mar 2012 11:05
URI: http://sro.sussex.ac.uk/id/eprint/31142
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