Spectrophotometric study of adducts of nickel-5 nitro-8-quinolinate with heterocylic and other nitrogen bases |
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| Affiliation: | 1. National Key Laboratory of Green Pesticides, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China;2. National Key Laboratory of Agricultural Microbiology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China;3. National Key Laboratory of Green Pesticides, College of Chemistry, Central China Normal University, Wuhan 430079, China;4. NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063;5. Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, China;1. Toyota Motor Engineering and Manufacturing North America Inc., 1555 Woodridge Avenue, Ann Arbor, MI 48105, USA;1. School of Material and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, PR China;2. Henan Key Laboratory of Functional Salt Materials, Center for Advanced Materials Research, Zhongyuan University of Technology, Zhengzhou 450007, PR China;3. CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences (CAS), Shanghai 201210, PR China;1. School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, Guangdong, China;2. EACOMP, Shenzhen 518055, Guangdong, China;3. Fujian Science & Technology Innovation Laboratory for Energy Devices of China (21C-LAB), Ningde 352100, Fujian, China;4. PKU-HKUST ShenZhen-HongKong Institution, Shenzhen 518055, Guangdong, China |
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| Abstract: | Adduct formation constants have been determined by spectrophotometric study of the organic base-adducts of nickel (II) chelate of 5-nitro-8-quinolinol in a monophase-chloroform. Bathochromic and hypsochromic shifts were observed in the optical spectra, in visible range, due to adduct formation. A penta coordinated square-base pyramidal structure is proposed for the low pK pyridine base adducts whereas hexa coordinated octahedral structure is favoured for adducts with bases of higher pK values. The stabilities of the nickel adducts increase in the following order of the base: 2,4-lutidine <2-picoline <2,4,6-collidine 1-bipyridyl. |
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