54907-55-0Relevant articles and documents
GROUP IB ORGANOMETALLIC CHEMISTRY. XXXIII. ArAuPPh3, ArAu(CNR), (ArAu)n AND Ar4CuAu2 COMPOUNDS IN WHICH THE ARYL GROUP CONTAINS 2-MeO, 2,6-(MeO)2, 2-Me2N, 2-Me2NCH2 AND (S)- OR (R)-2-Me2NCHMe SUBSTITUENTS AS POTENTIAL LIGANDS
Koten, Gerard van,Schaap, Cees A.,Jastrzebski, Johann T. B. H.,Noltes, Jan G.
, p. 427 - 445 (2007/10/02)
The synthesis and structural characterization by 1H NMR and 197Au Moessbauer spectroscopy as well as by chiral labelling of the built-in ligands of three different types of arylgold(I) compounds is described. 197Au Moessbauer data revealed that the benzyl- and arylgold(I) triphenylphosphine complexes which bear potential coordinating substituents at an ortho position still contain linearly coordinated AuI with 2c-2e gold(I)-carbon bonds.The observation of isochronous NMe resonances in (S)-2-Me2NCH(Me)C6H4AuPPh3 confirms that no additional intramolecular Au-N coordination occurs in solution.Preliminary results of an X-ray diffraction study of 2,6-(MeO)2C6H3AuPPh3 are reported (R=0.040, PAuC1 angle 172.6 deg.Unsymmetrical AuC1C2 and AuC1C6 angles of 126.4 and 117.4 deg, respectively).Pure, uncomplexed arylgold(I) compounds have been isolated from the reaction of diarylgoldlithium compounds (arylaurates) with trimethyltin bromide. (S)-2-Me2NCHMeC6H4Au has a dimeric structure which most likely consists of two monomeric units associated by intermolecular Au-N coordination thus forming a ten-membered chelate ring.The structure of insoluble 2-Me2NCH2C6H4Au and 2-Me2NC6H4Au are less clear.The former compound probably has a structure similar to (S)-2-Me2NCHMeC6H4Au (IS/QS values for two-coordinate AuI centers).However, the strongly deviating IS and QS values of 2-Me2NC6H4Au indicate that a polynuclear structure for this compound similar to that proposed for 2-Me2NC6H4Cu cannot be excluded (a polymeric structure containing 2-Me2NC6H4 groups which span three Au atoms by 3c-2e Au2C bonds and Au-N coordination).The mixed Au/Cu cluster (2-Me2NCH2C6H4)4Au2Cu2 is accessible via the 1/2 reaction of (2-Me2NCH2C6H4)4Au2Li2 with CuI.Molecular weight and 1H NMR studies point to a tetranuclear structure in solution, while mass spectrometry shows fragment ions with m/e corresponding to (2-Me2NCH2C6H4)3Au2Cu2+, (2-Me2NCH2C6H4)2Au+.
