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DOI: 10.1039/A701486D (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 2263-2266

Synthesis of dinuclear gold-(I) and -(II) complexes by reaction of [AuI2{µ-(CH2)2 PPh2}2] with protonic acids

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Manuel Bardají, Elena Cerrada, Peter G. Jones, Antonio Laguna and Mariano Laguna

Abstract

The reaction of the bis(ylide) gold complex [Au2{µ-(CH2)2PPh2 }2] with strong acids (such as HClO4) in the presence of diphosphines L–L afforded a mixture of heterobridged gold(I) complexes [Au2{µ-(CH2)2PPh2 }(µ-L–L)]+ (L–L = Ph2PCH2CH2 PPh2 or Ph2PCH2PPh2) and [PPh2Me2]+. After addition of Li(tcnq), [Au2{µ-(CH2)2PPh2 }(µ-L–L)]2[ClO4][tcnq] were obtained pure (tcnq = 7,7,8,8-tetracyanoquinodimethane). The crystal structure of the Ph2PCH2CH2PPh2 derivative shows an intramolecular gold–gold distance of 3.1294(9) Å. The use of weak protonic acids such as pyridine-2-thiol (C5H5NS) or 2-sulfanylbenzothiazole (C7H5NS2), in the presence of atmospheric oxygen, led to complexes of gold(II). The crystal structure of [AuII2{µ-(CH2)2PPh 2}2(C5H4NS)2 ] shows a gold–gold bond length of 2.6686(13) Å.

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