Synthesis, isomerism and supramolecular chemistry of diphenylmethanimine complexes of the coinage metals

Wolfgang Schneider, Andreas Bauer, Hubert Schmidbaur

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Abstract

The reactions of [AuCl(SMe2)] or [AuBr(C4H8S)] with 1 equivalent of diphenylmethanimine led to the formation of the complexes [AuCl(Ph2C=NH)] 1a, [Au(Ph2C=NH)2][AuCl2] 1b and [Au(Ph2C=NH)2][AuBr2] 2, respectively. Treatment of 1a, 1b with KI in the two-phase system dichloromethane-water induced a redox process to give Au0 and [Au(Ph2C=NH)2][I3] 3. The same result was obtained when AuI and Ph2C=NH were allowed to react under anhydrous and oxygen-free conditions. Copper(I) iodide reacted with an excess of Ph2C=NH with formation of the complex [CuI(Ph2C=NH)] 4. Bis(diphenylmethanimine) complexes of gold, [Au(Ph2C=NH)2]BF4 5, and silver, [Ag(Ph2C=NH)2]BF4 6, were prepared by the reaction of 2 equivalents of the ketimine and [Au(PhCN)2]BF4 or AgBF4 in dichloromethane or tetrahydrofuran solutions, respectively. The crystal structures of the complexes 1a, 1b, 2, 3, 5 and 6 have been determined. The (Ph2C=NH)AuCl units of compound 1a form infinite zigzag chains via weak Au ⋯ Au contacts [3.3633(5) Å]. In 1b two AuCl2- anions and two (Ph2C=NH)2Au+ cations form a tetranuclear Z-type unit with Au ⋯ Au contacts of 3.1944(5) [Au(1) ⋯ Au(2)], 3.604(1) [Au(1) ⋯ Au(2′)] and 3.392(1)Å [Au(1) ⋯ Au(1′)]. The N-H ⋯ Cl geometry suggests hydrogen bonding between the hydrogen and chlorine atoms of neighbouring ions. The bromine compound 2 is isostructural to the chloride 1b with slightly longer Au ⋯ Au distances. Compound 3 shows bis(diphenylmethanimine)gold(I) cations and triiodide anions with no anomalies in the packing and in bond distances and angles. The geometry of the silver(I) and gold(I) complexes 5 and 6 are quite similar except for the observation that the Au-N bond is 0.11 Å shorter than the Ag-N bond, which suggests that two-co-ordinate gold(I) is indeed smaller than two-co-ordinate silver(I) in systems with nitrogen-containing ligands, as previously observed for phosphine complexes.

Original languageEnglish
Pages (from-to)415-420
Number of pages6
JournalJournal of the Chemical Society. Dalton Transactions
Issue number3
DOIs
StatePublished - 7 Feb 1997
Externally publishedYes

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