The kinetics of the reaction Of L-aspartic acid (H3L+) with hydroxopentaaquarhodium (III) has been studied over the range 2.58less than or equal to10(3)[H3L+] less than or equal to12.90, 3.49 less than or equal topHless than or equal to 4.3, 50degreesless than or equal to t less than or equal to65degreesC and I=0.1mol dm(-3) (NaClO4). The reaction takes place via an outer sphere association between RhOH2+ and (H3L+) followed by transformation of the outer into an inner-sphere complex (chelate is formed) by slow interchange. The anation rate constant RhOH3+ at 25degreesC and I= 0.1mol dm(-) (NaClO4) is found to be 2.2x10(-6)s(-1). DeltaH(#) and DeltaS(#) for k(an) path are found to be 62.0+/-1.2 kJ mol(-1) and -120.8+/-3.4 JK(-1)mol(-1) respectively. Anation reaction of RhOH2+ follows an Ia path.
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