Intraligand fluorescence of Zn(II) and Pt(II) complexes of pyridoxal thiosemicarbazone |
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| Affiliation: | 1. College of Pharmaceutical Sciences, Heilongjiang University of Chinese Medicine, Harbin 150040, PR China;2. Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun 130024, PR China;3. Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, PR China |
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| Abstract: | Pyridoxal (vitamin B6 aldehyde) thiosemicarbazone (B6TSC) is deprotonated to its anion (B6TSC – H+) in basic solution at pH = 9. It shows an intense green fluorescence with λmax = 500 nm and a quantum yield of unity. Zn(II)(B6TSC – H+)(acetate) displays an blue-green intraligand (B6TSC) fluorescence of moderate intensity. The complex cation Pt(II)(B6TSC)Cl]+ is isolated as tetraphenylborate. In basic solution (pH = 9) this cation is deprotonated to the neutral complex Pt(II)(B6TSC – H+)Cl] which exhibits the same green intraligand fluorescence as the free anion (B6TSC – H+)?. However, in the platinum complex this emission is much less intense. It is reduced to φ = 10? 2. |
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