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KMID : 1059519890330020164
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Journal of the Korean Chemical Society
1989 Volume.33 No. 2 p.164 ~ p.167
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Pressure Effect on the Aquation of trans-[Cr(tmd)2F2]+ and trans-[Cr(tmd)2FCl]+ Ions
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Chung Jong-Jae
Kim Han-Tae
Baek Sung-Oh
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Abstract
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The rate for the aquation of trans-[Cr(tmd)2FX]+ (X = F-, Cl-) ion in aqueous acidic solution has been measured by spectrophotometric method at various temperatures and pressures. The rate constants are increased with increasing temperatures and pressures. The values of activation entropy are 5.2 eu for trans-[Cr(tmd)2F2]+ and -16.62 eu for trans-[Cr(tmd)2FCl]+ ions. Activation volumes have all negative values and lie in the limited range -3∼-2 cm3mol-1 for trans-[Cr(tmd)2F2]+ and -8∼-7 cm3mol-1 for trans-[Cr(tmd)2FCl]+ ion. From the above results, we may deduce that the mechanism for the aquation of trans-[Cr(tmd)2F2]+ and trans-[Cr(tmd)2FCl]+ ions is interchange-associative mechanism and dissociative mechanism respectively.
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KEYWORD
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