Molar heat capacities of disk-like compounds benzene-hexa-n-nonanoate (BH9) and benzene-hexa-n-decanoate (BH10) have been measured with an adiabatic calorimeter between 13 K and 390 K. Three and two different phases appeared in the solid states of BH9 and BH10, respectively. Molar entropies and transition entropies were determined and compared with those of other benzene-hexa-n-alkanoates BHn (n: 5 to 10). The odd-even effect with respect to the number of carbon atoms in a side chain of a disc-like molecule was observed in the cumulative transition entropies. The molar entropies exhibited a peculiar 'pairing phenomenon' between BH(2m - 1) and BH(2m), where m is integer. This phenomenon is well accounted for in terms of characteristic molecular structure and packing in the crystal lattice. (C) 2003 Elsevier Science Ltd. All rights reserved.