title: Wiring terpyridine: approaches to alkynylthienyl 2,2':6',2''-terpyridines.
abstract: The reaction of triisopropylsilylethyne or trimethylsilylethyne with 4'-(5-bromo-2-thienyl)-2,2':6',2''-terpyridine () leads to 4'-(5-triisopropylsilylethynyl-2-thienyl)-2,2':6',2''-terpyridine () or 4'-(5-trimethylsilylethynyl-2-thienyl)-2,2':6',2''-terpyridine (). The latter compound may be deprotected to give 4'-(5-ethynyl-2-thienyl)-2,2':6',2''-terpyridine (). Treatment of the complexes [Ru()(2)][PF(6)](2), [Ru(tpy)()][PF(6)](2) and [Ru()(2)][PF(6)](2) ( = 4'-(4-bromo-2-thienyl)-2,2':6',2''-terpyridine) with triisopropylsilylethyne yields the corresponding homoleptic and heteroleptic alkynylthienyl-terminated ruthenium(ii) complexes, for which spectroscopic and electrochemical data are presented. The reaction of [RuCl(2)(DMSO)(4)] with leads to [Ru()(2)][PF(6)](2), in which the tpy ligands bear conjugated thienyl and alkynyl groups; the latter can also be accessed by deprotection of [Ru()(2)][PF(6)](2). The single-crystal structures of ligands and , and of [Ru()(tpy)][BPh(4)](2).1.3MeCN, [Ru()(2)][PF(6)](2).2MeNO(2), 2{[Ru()(2)][PF(6)](2)}.5MeCN, [Ru()(2)][PF(6)](2) and [Ru()(2)][PF(6)](2).MeCN are presented, and among the homoleptic complexes, pi-stacking interactions between thiophene and pyridine rings leading to pairs of associated cations provide a common structural motif.
authors.affiliation: Department of Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland.
authors.forename: Edwin C
authors.initials: EC
authors.lastname: Constable
authors.forename: Egbert
authors.initials: E
authors.lastname: Figgemeier
authors.forename: Catherine E
authors.initials: CE
authors.lastname: Housecroft
authors.forename: Swarna Latha
authors.initials: SL
authors.lastname: Kokatam
authors.forename: Elaine A
authors.initials: EA
authors.lastname: Medlycott
authors.forename: Markus
authors.initials: M
authors.lastname: Neuburger
authors.forename: Silvia
authors.initials: S
authors.lastname: Schaffner
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Zampese