The Thermodynamics of Chromatography - The Thermodynamic Analysis of the Dispersive Interactions that Can Take Place between Different Solutes and High Molecular Weigh > Page 15

The Thermodynamic Analysis of the Dispersive Interactions that Can Take Place between Different Solutes and High Molecular Weight n-Alkanes.

Adopting the procedure of dividing (DGo) into different parts so that the each portion represents the standard free energy associated with specific parts of a molecule, consider the distribution of the standard free energy throughout an n-alkane molecule. If a portion of (DGo) is allotted to each methylene group and also to the two methyl groups, then, algebraically, this can be expressed as follows.

RTLn(V'r(T)) = -nDGo(MethyleneGroup) -mDGo(Methyl Group)

 

 

DGo(Methylene Group) is standard free energy of the methylene group,  
DGo(Methyl Group) is standard free energy of the methyl group,  
(n) is the number of methylene groups,  
and, (m) is the number of methyl groups (m=2 for an n-alkane).