FTIR STUDY OF THE SYMMETRICAL NU-S(PO32-) MODE OF 5'-CMP IN (H2O)-H-2SOLUTION - MOLECULAR RELAXATION PROCESSES

FTIR measurements on the v(s)(PO32-) band shape of 5'-CMP in (H2O)-H-2 solution at different concentrations, 0.002-0.58 mol dm-3, and temper atures, 10-55-degrees-C, have been interpreted in terms of the dynamic s of the PO32- group and the self-association processes of this mononu cleotide. A possible aggreation process of 5'-CMP at approximately 0.3 mol dm-3 has been detected from the second derivative and the integra ted intensity of the band. Vibrational relaxation seems to be the main relaxation pathway for this mode, and vibrational dephasing appears a s the fastest process among the different relaxation channels. An inte rmediate modulation regime for the vibrational frequency is obtained.