Conductance of some cobalt(III) complexes in water at 25°C. Part 1.—Conductance of salts of trans- and cis-dinitrobis(ethylenediamine)cobalt(III)
Abstract
Precise conductivity results are reported for aqueous solutions of seven salts of trans- and cis-[Co(en)2(NO2)2]+. They are analysed in terms of the full Pitts equation and the association constants for the salts, although small, are found to increase with increasing radii of the ions, being particularly large for cis-[Co(en)2(NO2)2]I. Contrary to popular belief, trans-[Co(en)2(NO2)2]ClO4 is also appreciably associated in dilute aqueous solution. Rate constants for the very slow aquation of these cations are also reported.