ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 30, Number 4
JKCSEZ 30(4)
August 20, 1986 

The rate for the aquation of trans-[Cr(en)2Br2]+ and trans-[Cr(tn)2Br2]+ ions in the aqueous solution has been measured by the conductometric method at various pressures and temperatures. The rate constants are increased with increasing temperature and decreased with increasing pressure. Activation volumes are all positive values and lie in the limited range +1.6 ∼ +2.3Ocm3/mole for trans-[Cr(en)2Br]+ and +1.30 ∼ +1.92cm3/mole for trans-[Cr(tn)2Br]+. Activation entropies have small negative values while activation compressibilities have small positive values. From the above results, we may deduce that the mechanism for the aquation of these complexes is the Id mechanism.