Formula accounting for the catalyst effect on entropy.

["Park, Tae-Yun" <tp-: at :-elptrs7.rug.ac.be>]

 Dear all,
 Please let me have your idea on the following problem.
 Consider the following reaction,
         +                                  +
       C-C-C  +  C=C-C  --->(TS)--->  C-C-C-C-C     (1)
                                        C
 and focus on the entropy differences between reactants and the transition
 state(TS) at 298.15K , i.e.,
                              +
       delta_S* = S(TS) - S(C-C-C) - S(C=C-C)       (2)
 If reaction (1) occurs in a catalytic reaction sysem, there should be
 another factor(s) that influences the value of delta_S*.
 Under the condition that the entropy values for all the reactants and the
 product in *GAS-PHASE* are available, but NOT for the transition state,
 my question is,
 	is it possible to construct a general formula which includes
         the factor(s) which can account for the catalyst effect?
 More clearly, is it possible to relate the delta_S* for catalytic
 reaction to gas-phase values of entropies for reactants and product,
 and some unknown parameter? I.e.,
   delta_S* = function of
              [ S(reactants), S(product), parameter]
 If so, what does this equation look like?  Should it be in a kind of
 added form, i.e.,
               S(reac) +/- S(prod) +/- parameter(s)
 or multiplied form, i.e.,
               parameter*S(reac) +/- parameter*S(prod) +/- ...
 or something else??
 Any suggestion/information(books, articles..)/advice will be
 a great help for me.
 				Sincerely,
 				     Park, TAE-YUN
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 State University of Ghent
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