Aquation of cis-dinitrobisbiguaniderhodium (111) nitrate was investigated cond-uctornetricaIly. Rates of the release of first and the second nitro groups were derived by a graphical method. For both the steps of aquation, the presence of electron accepting 'nitro' group, favours 'bond formation' by the incoming ligand in the transition stage and it occurs before the 'bond rupture' is complete. The IOSS of the second 'nitro' group most probably takes place afong with a hydrogen ion from the 'aquo' ligand introduced in the first step of aquation with the resultant formation of the hydroxoaquobisbiguanide complex. Activation parameters were evahated and are as foIIows: AH $ are 1 8~1 . 2 and 18.6&I.1 kculsmole-~ and ASS are --15*2.7 and -19k2.3 e. I I . respectively for the first and the second steps of aquation.
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