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By reacting the dialkynes HCC(Ar)CCH [Ar=1,3-C6H4 (mphen), 1,3-(C6HMe3-2,4,6) (mes), 1,4-(C6Me4-2,3,5,6) (dur)] with [AuClL] [L=dimethylsulfide (dms), tetrahydrothiophene (tht)] in the presence of an excess of Et3N the polymeric complexes [AuCC(Ar)CCAu]n [Ar=mphen (1), mes (2) dur (3)] were prepared. Upon reaction of these complexes with two equivalents of phosphine or isocyanide ligands (L), complexes [LAuCC(Ar)CCAuL] [Ar=mes, L=tBuNC (4), XyNC (5); Ar=dur, L=PPh3 (6), tBuNC (7)] were prepared in good yields. The complex [tBuNCAuCC(mphen)CCAuCNtBu] (8) was prepared by reaction of the corresponding diethynylarene with 2 equiv. of [AuCl(CNtBu)] in the presence of NEt3. By reacting the appropriate diethynylarene with 2 equiv. of [Au(acac)PPh3], complexes [Ph3PAuCC(Ar)CCAuPPh3] [Ar=mphen (9), mes (10)] were prepared. The carbene complex [(tBuNH)(Et2N)CAuCC(mes)CCAuC(NHtBu)(NEt2)] (11) was obtained by reacting the corresponding isocyanide complex 4 with diethylamine. The crystal structures of complexes 9 and 10 have been determined by X-ray diffraction studies. In both cases one of the gold atoms is in an essentially linear environment [CAuP: 176.95(14) (9), 177.19(8)° (10)] while the other CAuP bond angle is appreciably bent [170.07(11) (9), 171.22(8)° (10)]. |
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