title: Metal-directed synthesis and photophysical studies of trinuclear v-shaped and pentanuclear x-shaped ruthenium and osmium metallorods and metallostars based upon 4'-(3,5-dihydroxyphenyl)-2,2':6',2''-terpyridine divergent units.
abstract: A new series of V-shaped trinuclear metallorods and X-shaped pentanuclear metallostars has been prepared by the reaction of metal complexes bearing pendant phenolic functionalities with complexes containing electrophilic ligands. Specifically, {M(tpy)2} motifs (M=Ru or Os; tpy=2,2':6',2''-terpyridine) bearing one or two pendant 3,5-dihydroxyphenyl substituents at the 4-position of the central ring of the tpy have been reacted with the complexes [Ru(tpy)(Xtpy)]2+ (X=Cl or Br) to form new ether-linked species. The energy transfer from ruthenium to osmium in these complexes has been investigated in detail and the efficiency of transfer shown to be highly temperature dependent; the energy transfer is highly efficient at low temperature, whereas at room temperature nonradiative and nontransfer deactivation of the excited {Ru(tpy)2}* domains is most significant.
authors.affiliation: Department of Chemistry, University of Basel, Spitalstrasse 51, 4056 Basel, Switzerland. edwin.constable@unibas.ch
authors.forename: Edwin C
authors.initials: EC
authors.lastname: Constable
authors.forename: Robyn W
authors.initials: RW
authors.lastname: Handel
authors.forename: Catherine E
authors.initials: CE
authors.lastname: Housecroft
authors.forename: Angeles
authors.initials: A
authors.lastname: Farràn Morales
authors.forename: Barbara
authors.initials: B
authors.lastname: Ventura
authors.forename: Lucia
authors.initials: L
authors.lastname: Flamigni
authors.forename: Francesco
authors.initials: F
authors.lastname: Barigelletti