Profile analysis of PO3-symmetric stretching infrared band |
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| Affiliation: | 1. Soil Science Laboratory, School of Applied Bioscience, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, Republic of Korea;2. Department of Applied Biosciences, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, Republic of Korea;1. School of Pharmaceutical Sciences, Jinan University, Guangzhou 510632, China;2. Pharmaceutical Research Center, Guangzhou Medical University, 195# Dongfengxi Road, Guangzhou 510182, China;1. Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin 541004, China;2. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China;2. Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, PR China;3. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, PR China |
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| Abstract: | Studies by vibrational spectroscopy of biological systems usually deal with band frequencies and frequency shifts. Band shape analysis can give interesting information about the dynamic behaviour of biological molecules. The main object of this work is the FTIR band shape analysis of the PO3-symmetric stretching mode of 5′-GMP in H2O and μ solutions. The study of the concentration effects in both solvents reveals that while the frequency remains constant the FWHH increases in a critical concentration range (0.32 mol dm−3 – 0.44 mol dm−3). A qualitatively similar change has been previously observed in the νmax of some bands (ref. 1). Moments analysis and time correlation functions calculations have been performed. The results obtained for M2 and M3 in H2O and 2H2O solutions indicate that the observed band shape follows neither a Cauchy nor Gauss function. Apparently as the 5′-GMP concentration increases, the relaxation time, τ, decreases. Solvent change from H2O to 2H2O produces a slight decrease in band symmetry and a increase in τ. FWHH and τ values are interpreted according to relaxation processes. |
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