The interaction of H+, Zn(II) and Cu(II) with adenine and 9-methyladenine |
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| Affiliation: | 1. Department of Environmental Technology, Kaunas University of Technology, Radvilėnų av. 19, LT-50254 Kaunas, Lithuania;2. Institute of Chemistry, Center for Physical Sciences and Technology, Goštauto 9, LT-01108 Vilnius, Lithuania;1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, PR China;2. State Key Laboratory for Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, PR China;3. Mianyang Kingtiger New Energy Technology Co. Ltd., Mianyang, 621000, Sichuan, PR China;4. Center of Analysis and Test, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, PR China;5. Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, PR China;1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China;3. College of Science, Central South University of Forestry and Technology, Changsha 410004, China;4. Industrial Application Group, Synchrotron Radiation Research Center, Hsinchu 30076, China;5. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;3. Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;4. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China;1. Department of Chemistry, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada |
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| Abstract: | The interaction of H+, Zn(II) and Cu(II) with adenine (A), and 9-methyladenine (9-MeA) is examined by means of potentiometry, spectrophotometry, 1H NMR and ESR spectroscopy. Quantitative evaluation of the protonation and of the stability constants of the 1:1 complexes with Cu(II) and Zn(II) is given for both adenine and 9-methyladenine ligands. Analysis of possible bonding sites are discussed based on 1H NMR titration curves and on the stabilities of the considered species. Additionally, Cu(II) forms strong dimeric complexes with adenate (N9 deprotonated adenine), which acts as a bridging ligand via N9 and N3 atoms. The species formed and the values of their formation constants are given. |
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