摘要 : The new ligands 2,6-bis[{2'-(N,N-dialkylaminomethyl)phenylselanyl}methyl]pyridine with the general formula 2,6-[{2'-(R2NCH2)C6H4}SeCH2](2)C5H3N [R = Me (L-1), Et (L-2)], based on pyridine functionalized with organoselenium groups,... 展开 The new ligands 2,6-bis[{2'-(N,N-dialkylaminomethyl)phenylselanyl}methyl]pyridine with the general formula 2,6-[{2'-(R2NCH2)C6H4}SeCH2](2)C5H3N [R = Me (L-1), Et (L-2)], based on pyridine functionalized with organoselenium groups, were obtained by reacting 2-(R2NCH2)C6H4SeNa with 2,6-bis(bromomethyl)pyridine in 2:1 molar ratio. The coordination behaviour of the potentially multidentate ligands was investigated towards gold(I) and silver(I) in reactions with AgOTf (OTf = CF3SO3), AgPF6 and (C6F5)Au(tht) (tht = tetrahydrothiophene), when the metal complexes [AgL]X [X = OTf, L = L-1 (1), L-2 (2); X = P(F)6, L = L-1 (3), L-2 (4)], [(C6F5Au)(2)L-1] (5) and [(C6F5)AuL2] (6), were isolated. Multinuclear NMR spectroscopy (H-1, C-13, F-19, P-31, Se-77, as appropriate) and mass spectrometry were employed to investigate the two ligands and the metal complexes in solution. The single crystal X-ray diffraction studies revealed a N,Se,N,Se,N-monometallic pentaconnective (kappa Se-2(1),Se-2-kappa N-3(1),N-2,N-3) coordination behaviour of L-1 in 1, a Se,N- bimetallic biconnective (bridging) [mu(Au-Au)(1 kappa N-1(1)-2 kappa Se-1(2)) coordination behaviour of L-1 in 5 and a Se,N,Se-monometallic triconnective (pincer like, kappa Se-2(1),Se-2-kappa N-1) pattern of L-2 in 6, while in the free ligands the nitrogen atoms of the two pendant arms are intramolecularly coordinated to selenium. In solid state, both 5 and 6 display metallophilic Au center dot center dot center dot Au interactions. 收起