Artículos de revistas
Estimating The Value Of The Metal-ligand Bond Dissociation Enthalpy<d> (m-l) For Adducts Using Empirical Equations Supported By Tg Data
Registro en:
Quimica Nova. , v. 22, n. 3, p. 316 - 318, 1999.
1004042
2-s2.0-0001573202
Autor
De Farias R.F.
Institución
Resumen
In this work is presented and tested (for 106 adducts, mainly of the zinc group halides) two empirical equations supported in TG data to estimate the value of the metal-ligand bond dissociation enthalpy for adducts: <D> (M-O) = ti / γ if ti < 420 K and <D> (M-O) = (ti / γ ) - 7,75 . 10.2 . ti if ti > 420 K. In this empirical equations, ti is the thermodynamic temperature of the beginning of the thermal decomposition of the adduct, as determined by thermogravimetry, and y is a constant factor that is function of the metal halide considered and of the number of ligands, but is not dependant of the Iigand itself. To half of the tested adducts the difference between experimental and calculated values was less than 5%. To about 80% of the tested adducts, the difference between the experimental (calorimetric) and the calculated (using the proposed equations) values are less than 15%. 22 3 316 318 Da Silva, Z.R., De Queiroz, J.C., Vieira, E.F.S., Dias, F.S., (1996) Thermochim. Acta, 285, p. 289 Vieira, E.F.S., De Queiroz, J.C., Dias, F.S., (1995) Thermochim. Acta, 256, p. 249 Airoldi, C., Chagas, A.P., (1992) Coord. Chem. Rev., 119, p. 29 De Parias, R.F., (1997) An. Assoc. Bras. Quím., 46, p. 172 De Farias, R.F., (1997) Quím. Nova, 20, p. 478 De Farias, R.F., (1998) Quím. Nova, 27, p. 437 De Oliveira, O.A., (1981), Doctor's Thesis, Universidade Estadual de Campinas, UNICAMP, Campinas, SPDe Oliveira, O.A., Airoldi, C., Chagas, A.P., (1983) Inorg. Chem., 22, p. 136 Airoldi, C., Digiampietri, E.A., (1992) J. Chem. Thermodyn., 24, p. 33 Assunção, F.P., (1980), Doctor's Thesis, Universidade Estadual de Campinas, UNICAMP, Campinas, SPSantos, M.R.M.C., (1985), Master's Thesis, Universidade Estadual de Campinas, UNICAMP, Campinas, SPSantos, M.R.M.C., Airoldi, C., (1988) Thermochim. Acta, 125, p. 295 De Queiroz, J.C., (1983), Doctor's Thesis, Universidade Estadual de Campinas, UNICAMP, Campinas, SPDe Queiroz, J.C., Airoldi, C., Chagas, A.P., (1986) J. Chem. Thermodyn., 18, p. 709 Da Silva Jr., U.G., (1996), Master's Thesis, Universidade Federal do Rio Grande do Norte. UFRN, Natal, RNDe Simoni, J.A., (1978), Doctor's Thesis, Universidade Estadual de Campinas, UNICAMP, Campinas, SPDe Farias, R.F., De Oliveira, O.A., (1996) Quím. Nova, 19, p. 100 Dos Santos, L.C.R., De Oliveira, S.F., Espínola, J.G.P., Airoldi, C., (1992) Thermochim. Acta, 206, p. 13 Dos Santos, L.C.R., De Oliveira, S.F., Espínola, J.G.P., (1993) J. Chem. Thermodyn., 25, p. 1319 Dustan, P.O., Airoldi, C., (1988) J. Chent. Eng. Data, 33, p. 93 Jensen, W.B., (1980) The Lewis Acid-Base Concepts, , John Wiley & Sons. New York