# Isomerizzazione non catalizzata del $_c_i_s-[Pt(P(C_2H_5)_3)_2(o-tolile)Cl]$ in solventi protici

Faraone, G. and Ricevuto, Vittorio and Romeo, Raffaello and Trozzi, M. (2005) Isomerizzazione non catalizzata del $_c_i_s-[Pt(P(C_2H_5)_3)_2(o-tolile)Cl]$ in solventi protici. Accademia Peloritana dei Pericolanti Classe FF.MM.NN., 83. pp. 67-83.

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The rates of the spontaneous conversion of the $_c_i_s- [Pt(P(C_2H_5)_3)_2(o-tolyl)Cl]$ into the $_t_r_a_n_s$ form in methanol and ethanol at different temperatures have been examined. The $_c_i_s-_t_r_a_n_s$isomerization takes place with positive entropy of activation changes and the composite first-order-rate constant verifies the following expression: $k_i_s=\frac{k_1k_2}{k_2+ k_1[Cl^-].}$ An asynchronous mechanism is suggested in which the rate determining step of the reaction is the breaking of the bond between the metal and the chloride ion. The reaction profile contains two minumum points, corresponding to the presence of two labile intermediates havinh a <<like cis>> and a <<like trans>> structure. This is the first kinetic study of an uncatalyzed isomerization on platinum (II) complexes.