Solvation of iron and chromium complexes in alcohol-water mixtures

• Published in: Transition metal chemistry (Weinheim) 2002-03, Vol.27 (2), p.134
• Main Authors: Burgess, John, Hubbard, Colin D, Patel, Marttand S, Radulovic, Stojan, Thuresson, Kristina>, Parsons, Simon A, Guardado, Pilar
• Format: Article
• Language: English
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1023/A:1013945330869

Solubilities are reported for the perchlorates of five iron(II)-diimine complexes in t-BuOH-H^sub 2^O and one in MeOH-H^sub 2^O mixtures, for three iron(III)-3-hydroxy-4-pyranonate and three iron(III)-3-hydroxy-4-pyridinonate complexes in MeOH-H^sub 2^O and t-BuOH-H^sub 2^O, and for two chromium(III)-3-hydroxy-4-pyranonate complexes in MeOH-H^sub 2^O. Transfer chemical potentials are thence derived for the various iron(II), iron(III) and chromium(III) complexes, for transfer from H^sub 2^O into the respective mixed solvents (at 298.2 K). These results are combined with values reported earlier for related complexes, and for other alcohol-H^sub 2^O mixtures, to give an overall picture of solvation, expressed in the thermodynamic format of transfer chemical potentials, for iron(II)-diimine, iron(III)-3-hydroxy-4-pyridinonate and chromium(III)-3-hydroxy-4-pyranonate complexes in H^sub 2^O-rich aqueous-alcohol mixtures. Some spectroscopic (^sup 1^H-n.m.r.; i.r.) and kinetic (aquation rate constants at 298.2 K) data are reported for the chromium(III) complexes.[PUBLICATION ABSTRACT]