A spectroscopic study of adducts of heterocyclic nitrogen bases with nickel(II) chelates of 2-methyl-5-nitrophenylthiocarbazone |
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| Affiliation: | 1. Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, 153 41 Aghia Paraskevi, Athens, Greece;2. Department of Petroleum and Mechanical Engineering, Eastern Macedonia and Trace Institute of Technology, 654 04 St. Lucas, Cavala, Greece |
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| Abstract: | A spectrophotometric method was employed to study the adduct formation constants of a few typical bases with nickel(II) chelates of 2-methyl-5-nitrophenylthiocarbazone. Monobasic bases such as pyridine and methyl-substituted pyridines form pentacoordinated adducts with a stoichiometry of 1:1 for metal chelate-base. The dibasic bases such as 1,10-phenanthroline, 2,2′-bipyridyl, etc. also exhibit 1:1 stoichiometry giving hexacoordinated adducts. The experimental results are discussed in terms of the basicity and steric factors of the various bases. |
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