Vibrational and electronic spectral studies of substituted 1,3-dihydro-1,3-diphenyl-2-thioxo-2H,5H-pyrimidine-4,6-diones |
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| Affiliation: | 1. Chemistry Department, College of Science and Arts in Qurayate, Jouf University, Aljouf, Saudi Arabia;2. Chemistry Department, Faculty of Science, Fayoum University, P.O. Box 63514, Fayoum, Egypt;3. Egyptian Petroleum Research Institute, Nasr City, Cairo 11727, Egypt;4. Chemistry Department, College of Science, Jouf University, P.O. Box 2014, Sakaka, Jouf, Saudi Arabia;5. Chemistry Department, Faculty of Science, Al-Azher University, Egypt;1. Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany;2. Department of Materials Science and Engineering, NTNU, Norwegian University of Science and Technology, 7491 Trondheim, Norway;1. Department of Chemistry, University of Sussex, Brighton BN1 9QJ, UK;2. Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, 2730 SW Moody Ave., Portland, OR 97239, USA;1. Department of Chemistry, College of Science, King Faisal university, P.O. Box 400 Al-Ahsa 31982, Saudi Arabia;2. Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt;3. Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt;4. Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt;5. Department of Chemistry, Faculty of Science, Islamic University in Almadinah Almonawara, Almadinah Almonawara, 42351, Saudi Arabia;6. Department of Chemistry, College of Science, Ain Shams University, Al-bassia, Cairo, 11566, Egypt;7. Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt;1. Department of Chemistry, Faculty of Science, İnönü University, 9044280 Malatya, Turkey;2. Department of Physiology, Faculty of Medicine, İnönü University, 9044280 Malatya, Turkey;3. Department of Mathematics and Science Education, Faculty of Education, Ondokuz Mayıs University, 9055139 Samsun, Turkey;4. Department of Microbiology, Faculty of Medicine, Malatya Turgut Özal University, 9044280 Malatya, Turkey;5. Department of Microbiology, Faculty of Pharmacy, İnönü University, 9044280 Malatya, Turkey;1. Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;2. A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991 Moscow, Russian Federation;3. Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russian Federation;4. I. M. Sechenov First Moscow State Medical University, 119991 Moscow, Russian Federation |
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| Abstract: | The vibrational spectra of 1,3-diphenyl-; 1,3-di (4′-chlorophenyl)-; 1,3-di(3′-methoxyphenyl)-1,3-dihydro-2-thioxo-2H,5H-pyrimidine-4,6-diones in solid state (KBr pellet) and in solution (CHCl3 and CCl4) have been studied and assignments made. Tautomeric and hydrogen bonding behaviour are discussed. Electronic spectra in various solvents at different pH values are recorded. The effect of substituents, change of solvent on the π—π* and n—π* transitions of all the compounds is explained. The bathochromic and hypsochromic shifts observed when the neutral form changes to the cationic or anionic form depending on the pH of solution, are also discussed. |
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