Abstract
AbstractThe crystal structures for cis‐(Ph2PCH=CHPPh2)(AuI)2 and trans‐(Ph2PCH=CHPPh2)(AuI)2 are reported. The structure of cis‐(Ph2PCH=CHPPh2)(AuI)2 reveals a short intramolecular Au–Au distance of 2.9526(5) Å, while the structure of trans‐(Ph2PCH=CHPPh2)(AuI)2 shows intermolecular Au–Au distances of 3.2292(7) Å. Structural data for the iodide complexes are compared to previously reported crystal structural data for cis‐ and trans‐(Ph2PCH=CHPPh2)(AuCl)2 and dppbz(AuCl)2. The quantum yields for the photochemical isomerization of cis‐(Ph2PCH=CHPPh2)(AuX)2 with 334‐nm light, Φ(cis → trans), are 0.204, 0.269, and 0.363 for X = Cl, Br, and I, respectively. Prior results from ab initio calculations on the model cis‐ and trans‐Au2X2C2H2(PH2)2 complexes aid in the interpretation of the correlation between the quantum yield for isomerization and the calculated aurophilic attraction potential V(Re). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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