536994-54-4Relevant academic research and scientific papers
New monocyclopentadienyl complexes of Tantalum(V) and Titanium(IV) with chelating pyrimidinethiolate and oxypyridine ligands - Molecular structure of [Cp*TaCl3(SC6H7N2)]
Fandos, Rosa,Hernandez, Carolina,Otero, Antonio,Rodriguez, Ana,Ruiz, Maria Jose,Terreros, Pilar
, p. 493 - 498 (2003)
New monocyclopentadienyl species of TaV, [Cp*TaL3(XR)] (L = Cl, Me, X = O, S) bearing 4,6-dimethyl-2-pyrimidinethiolate (SR = SC6H7N2) or 3-cyano-4,6-dimethyloxypyridine (OR = OC8H7N2) ligands were prepared, namely [Cp*TaCl3(SC6H7N2)] (1), [Cp*TaCl3(OC6H7N2)] (2), [Cp*TaMe3(SC6H7N2)] (3). In addition, a bis(oxypyridine)titanium(IV) complex [Cp*TiMe2(OC8H7 N2)2] was isolated. The X-ray structure analysis of 1 revealed that the thiolate group is bonded to the metal center through the sulfur atom and one of the nitrogen atoms in an η2-fashion. The reactivity of complex 3 with isocyanides (CNR), R = tBu, Xyl (Xyl = 2,6-dimethylphenyl) was also studied showing differences depending on the nature of R group. The reaction with 2,6-dimethylphenyl isocyanide gives the azatantalacyclobutane complex [Cp*TaMe[XylN=CC(Me2)NXyl}(SC6H7 N2)] (5) as the final product, whereas in the reaction with tert-butyl isocyanide the η2-imine-containing complex [Cp*Ta {tBuNC{Me2)}{SC6H7N2)] (6) is proposed to be formed. The dynamic behavior of [Cp*TaMe3(SC6H7N2)] (3) was also studied by variable-temperature 1H NMR spectroscopy. ( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).
