Oxovanadium(V) 1,3-propanediolate chloride complexes: tetrameric clusters

摘要: Structural, spectroscopic, and catalytic studies of oxovanadium-(V) alkoxide chlorides have shown that these compounds are monomeric exhibit activities as oxidation catalysts Lewis acids. The structure the reaction product VOCl[sub 3] various 1,3-propanediol derivatives was characterized in solution at temperatures using multinuclear NMR spectroscopy. Although oxovanadium dialkoxide tend to be monomeric, induce cluster formation generating tetrameric complexes with a molecular formula (VOC1L)[sub 4] (where L is bidentate). preferred bridge over two (or three) vanadium atoms rather than form cyclic six-membered ring on one atom found corresponding phosphorus compounds. When ligand asymmetric, several were observed solution. A hydrolysis by X-ray crystallography. compound crystallizes triclinic space group P[bar 1] = 10.003 (2) [Angstrom], b 11.462 (3) c 11.699 [alpha] 65.72 (2)[degrees], [beta] 79.81 [gamma] 81.89 [degrees], V 1199.7 (4) [Angstrom][sup 3], Z 1. correlation between solid-state determined, possible pathway suggested. Vanadium used reagentmore » organic synthesis; however, suggest altered reactivities may surface presence ligands or substrates. show analogy breaks down containing derivatives, reducing prospects chemically preparing analogs cAMP.« less