Cis-[PtBr<inf>2</inf>(PPh<inf>2</inf>(4-catechol))<inf>2</inf>]: Synthesis, crystal structure, and computational modelling of its binding to nanocrystalline TiO<inf>2</inf>

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Journal Article
Journal of the Chemical Society. Dalton Transactions, 2006, 60 (55), pp. 680680 - 685685
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The complex cis-[PtBr2(PPh2(4-catechol))2] 1 has been synthesized by cleavage of the four methyl groups from cis-[PtCl2(PPh2(4-veratrole))2] using BBr3, followed by work-up in the presence of excess bromide. An X-ray crystal structure of 1·(ethanol)2confirms that the two catechol rings are adjacent to each other and approximately parallel, and therefore well structured to act as double bidentate ligands for adjacent metal atoms on the surface of a nanocrystal. The crystal packing of 1·(ethanol)2involves intermolecular hydrogen-bonding interactions and a parallel fourfold phenyl embrace between PPh2moieties. Density functional calculations have demonstrated that conformational variability of the aryl rings in cis-[PtBr2(PPh2(4-catechol))2] is energetically feasible, and two conformations of cis-[PtBr2(PPh2(4-catechol))2] as a complex ligand for Ti atoms on the various surfaces of the anatase and rutile structures of TiO2have been assessed for geometrical commensurability. Three structural models for adsorbates of cis-[PtBr2(PPh2(4-catechol))2] on TiO2are developed for anatase (110), anatase (101), and rutile (001). © 2006 The Royal Society of Chemistry.
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