η7-Cycloheptatrienyl-carbonylvanadium-komplexe mit mono- und bifunktionellen PHOSPHAN (cas 115-78-6)-liganden. Eine 51V-NMR-spektroskopische untersuchung

Add time:08/27/2019    Source:sciencedirect.com

The photo-induced reaction of (η7-C7H7)V(CO)3 with phosphanes (L) leads generally to monosubstituted derivatives of the type (η7-C7H7)V(CO)2(L) (1) (L = PMe3 (1a), PPh3 (1b), PnBu3 (1c), P(OMe)3 (1d), P(OEt)3 (1e), P(OMe)2(OSiMe3) (1f) and P(NMe2)3 (1g)). The synthesis may be conducted either directly under irradiation in tetrahydrofuran solution or indirectly via the photo-generated, labile acetonitrile complex (η7-C7H7)V(CO)2(NCMe) which reacts with L in a dark reaction under mild conditions. Disubstituted derivatives of the type (η7C7H7)V(CO)(L)2 (2) (L = PMe3 (2a) and P(OMe)3 (2d)) are only formed with small phosphane ligands. The chiral complex (η7-C7H7)V(CO)(PMe3)[P(OMe)3] (2a/d) can be generated photolytically from 1d and PMe3 and identified in solution.Binuclear complexes [(η7-C7H7)V(CO)2]2(μ2-LL) (3) (LL = Ph2PCCPPh2 (3h), cis-Ph2PCH=CHPPh2 (3i) and Me2PCH2CH2PMe2 (3j)) as well as chelate complexes (η7-C7H7)V(CO)(LL) (4) (LL = cis-Ph2PCH=CHPPh2 (4i) and Me2PCH2CH2PMe2 (4j)) can be obtained by photolysis of (η7-C7H7)V(CO)3 in the presence of bifunctional phosphanes LL. For the characterisation of the new complexes, the combination of 51V and 31P NMR spectroscopy has been shown to be particularly useful.

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