title: Expanded ligands: bis(2,2':6',2''-terpyridine carboxylic acid)ruthenium(ii) complexes as metallosupramolecular analogues of dicarboxylic acids.
abstract: Ligands in which multiple metal-binding domains are linked by a metal-containing moiety rather than a conventional organic group are described as "expanded ligands". The use of 4,4'-difunctionalised {Ru(tpy)(2)} units provides a linear spacer between metal-binding domains and we have extended this motif to expanded ligands containing two carboxylic acid metal-binding domains. In this paper, we describe the synthesis and structural characterisation of ruthenium(ii) complexes of 2,2':6',2''-terpyridine-4'-carboxylic acid and 4'-carboxyphenyl-2,2':6',2''-terpyridine. The ability of the ruthenium(ii) centre to charge compensate deprotonation of the carboxylic acid leads to Zwitterionic complexes and three representative compounds have been structurally characterised.
authors: Department of Chemistry, University of Basel, Spitalstrasse 51, 4056 Basel, Switzerland. edwin.constable@unibas.ch
authors: Edwin C
authors: EC
authors: Constable
authors: Emma L
authors: EL
authors: Dunphy
authors: Catherine E
authors: CE
authors: Housecroft
authors: Markus
authors: M
authors: Neuburger
authors: Silvia
authors: S
authors: Schaffner
authors: Frank
authors: F
authors: Schaper
authors: Stuart R
authors: SR
authors: Batten