Producción Científica Profesorado

Reactivity of TpMe2Ir(C2H4)(DMAD) with carboxylic acids. A DFT study on geometrical isomers and structural characterization



Salazar Pereda, Verónica

2011

Salazar, V., Sánchez-Cabrera, G., Zuno-Cruz, F.J., Suárez-Castillo, O.R., Cruz, J., Padilla, R., Hernández, M., Roa, A.E., Maya, C., Leyva, M.A., Rosales-Hoz, M.J., Thangarasu, P. Reactivity of TpMe2Ir(C2H4)(DMAD) with carboxylic acids. A DFT study on geometrical isomers and structural characterization, Journal of Organometallic Chemistry, 2011, Vol. 696, p. 748-757, ISSN 0022-328X


Abstract


The thermally unstable adduct TpMe2Ir(C2H4)(DMAD), which was generated in situ by the reaction of DMAD with TpMe2Ir(C2H4)2 (1) at low temperature, reacted with different carboxylic acids to produce the following compounds: TpMe2Ir(E-C(CO2Me)double bond; length as m-dashCH(CO2Me))(H2O)(OC(O)C6H4R), (R = H, 2a; o-OH, 2b; o-Cl, 2c; m-Cl, 2d; o-NO2, 2e; m-NO2, 2f;o-Me, 2g;p-Me, 2h) and TpMe2Ir(E-C(CO2Me)double bond; length as m-dashCH(CO2Me))(H2O)(OC(O)Me) 3. In the reaction of derivative 2a with Lewis bases, TpMe2Ir(E-C(CO2Me)double bond; length as m-dashCH(CO2Me))(L)(OC(O)C6H5), (L = Py, 4a; m-BrPy, 4b; m-ClPy, 4c; NCMe, 5) were obtained, of which 4b and 4c were isolated as a mixture of two isomers in which the substituted pyridine ring was present at different rotational orientations. All new compounds prepared were characterized by 1H and 13C{1H} NMR spectroscopy, the structure of compounds 2d, 2h and 4a being determined by X-ray diffraction analysis. DFT was used to analyze the relative stability and the structural orientation of the isomers.






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