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DOI: 10.1055/s-2007-968591
Pt×××Pt and π-π* Interactions in Luminescentσ-Alkynyl Platinum(II) Terpyridine Complexes
F. Camerel, R. Ziessel*, B. Donnio, C. Bourgogne, D. Guillon, M. Schmutz, C. Iacovita, J. P. Bucher
Université Louis Pasteur and Institut Charles Sadron, Strasbourg, France
Publication History
Publication Date:
22 May 2007 (online)
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Significance
The authors report the formation of gels and liquid crystals induced by Pt×××Pt and π-π* interactions. Syntheses of the pivotal ethynyl platforms are based on gallate-substituted derivatives with methyl, dodecyl (C12H25) or phytol-like (C20H41) substituents. The final complexes were prepared by a cross-coupling reaction under anaerobic conditions between the terminal ethynyl derivatives and [(terpy)PtCl]BF4 (terpy = 2,2′:6′,6-terpyridine). The reaction is catalyzed by CuI (ca. 6 mol%), and triethylamine is required to quench the nascent HCl. Compound 2b was found to be a good gelator of dodecane. Dark-green gels displaying a thermally reversible sol-gel-phase transition were obtained from hot dodecane solutions. The Pt×××Pt interactions were identified based on unique absorption and emission features and further confirmed by X-ray data of the columnar liquid crystal.