Expanded ligands: bis(2,2':6',2''-terpyridine carboxylic acid)ruthenium(ii) complexes as metallosupramolecular analogues of dicarboxylic acids.
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.
Constable
Edwin C
EC
Department of Chemistry, University of Basel, Spitalstrasse 51, 4056 Basel, Switzerland. edwin.constable@unibas.ch
Dunphy
Emma L
EL
Housecroft
Catherine E
CE
Neuburger
Markus
M
Schaffner
Silvia
S
Schaper
Frank
F
Batten
Stuart R
SR