3 years ago

Intraligand fluorescence of Zn(II) and Pt(II) complexes of pyridoxal thiosemicarbazone

Intraligand fluorescence of Zn(II) and Pt(II) complexes of pyridoxal thiosemicarbazone
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 =500nm 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=102.

Publisher URL: www.sciencedirect.com/science

DOI: S138770031730669X

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