Preparation, crystal structure and kinetics of acid hydrolysis of an isomer of [Cr(picdien)Cl][ZnCl4] [picdien = 1,9-bis(2'-pyridyl)-2,5,8-triazanonane]
Por:
Ugalde-Saldivar V., Luna-Canut M.A., Sosa-Torres M.E., Rosales-Hoz M.J., Toscano R.A., Tobe M.L.
Publicada:
1 ene 1990
Resumen:
The complex [Cr(picdien)Cl][ZnCl4] [picdien = 1,9-bis(2?-pyridyl)-2,5,8-triazanonane] has been prepared and its structure determined by a single-crystal X-ray diffraction study of the triclinic crystals: a = 9.118(3), b = 9.581(5), c = 14.042(5) Å, ? = 78.04(3), ? = 86.37(3)°, and ? = 76.56(3)°. The complex cation has the anti-?? configuration. The kinetics of aquation of the perchlorate salt has been studied in dilute aqueous nitric acid solution, [complex] = 5 × 10-3 mol dm-3. The rate constants are independent of [H+] over the range 0.10 < [H+] < 0.001 mol dm-3; k25°C = 6.0 × l0-6s-1, ?H‡ = 93.1 ± 2.2 kJ mol-1, ?S‡ = -32.9 ± 6.9 J K-1 mol-1.
Filiaciones:
Division de Estudios de Posgrado Facultad de Quimica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Mexico
Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, 04510, Mexico
Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ
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