Vibrational spectra of isomeric pyridinic carboxylic acids in solid state and in solution and their SERS studies in silver sol |
| |
| Institution: | 1. School of Chemistry, College of Science, University of Tehran, Tehran, Iran;2. School of Chemistry and Bio21 Institute, The University of Melbourne, VIC 3010, Australia;1. Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan;2. Department of Family Medicine, China Medical University Hospital, Taichung, Taiwan;3. School of Medicine, College of Medicine, China Medical University, Taichung, Taiwan;4. Department of Nutrition, China Medical University, Taichung, Taiwan;5. Department of Biological Science and Technology, China Medical University, Taichung, Taiwan;6. Department of Nursing, Mei Ho University, Pingguang Road, Pingtung, Taiwan;7. Department of Pathology, Changhua Christian Hospital, Changhua, Taiwan;8. Jen-Teh Junior College of Medicine, Nursing and Management, Miaoli, Taiwan;9. Chinese Medicine Department, China Medical University Beigang Hospital, Taichung, Taiwan;10. Department of Biotechnology, Bharathiar University, Coimbatore 641046, India;11. Translation Research Core, China Medical University Hospital, China Medical University, Taichung, Taiwan;12. Graduate Institute of Chinese Medical Science, China Medical University, Taichung, Taiwan;13. Department of Biological Science, Asia University, Taichung, Taiwan;14. Faculty of Applied Sciences, Ton Duc Thang University, Tan Phong Ward, District 7, 700000 Ho Chi Minh City, Vietnam;1. Instituto de Física, Universidade Federal de Goiás, CEP 74690-900, Goiânia, GO, Brazil;2. Instituto de Química, Universidade Federal de Goiás, CEP 74690-900, Goiânia, GO, Brazil;3. Federal Technological University of Paraná, CEP 86036370, Londrina, PR, Brazil;4. Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, CEP 05508-090, São Paulo, SP, Brazil;5. IMDEA Nanociencia, Campus Universitario de Cantoblanco, 28049, Madrid, Spain;1. Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, PR China;2. Experimental Teaching Center, Faculty of Functional Food and Wine, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, PR China |
| |
| Abstract: | Raman spectroscopic studies of three isomeric pyridinic carboxylic acids, viz. picolinic, nicotinic and iso-nicotinic acid in solid state, in aqueous solution and in silver hydrosol, in the frequency range 900–1750 cm?1, have been made. Assignments of the observed bands have been proposed in relation to the molecular forms present in solid state and in solution. Different degrees of intensity enhancements of the Raman bands in surface-enhanced Raman scattering (SERS) have been observed in all the three isomeric molecules. In iso-nicotinic acid, the intensity enhancement has been found to be minimum. Comparisons of Raman spectra in aqueous solution with those due to SERS in silver sol indicate that picolinic and nicotinic acid adsorb perpendicularly to the sol surface whereas in iso-nicotinic acid it occurs via donation of a π-electron of the aromatic ring, i.e. the plane of the ring lies parallel to the surface of the sol. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
