Coordination ability of 3-pyridinyl coumarins with palladium(II) and platinum(II)

Abstract

The coordination ability of two 3-pyridinyl coumarins with Pd(II) and Pt(II) both in solution and in solid state is elucidated by conventional and linear-polarized IR-spectroscopy of oriented colloid suspensions in nematic liquid crystal, ¹H- and ¹³C-NMR, UV-Vis spectroscopy, positive and negative ion mass spectrometry (ESI), HPLC tandem mass spectrometry (HPLC ESI MS/MS), TGV, and DSC methods. The four metal complexes are compared with free ligands. Density functional theory calculations are performed to obtain the electronic structure and vibrational properties of the compounds to support the experimental data.

Keywords:

• 3-Pyridinyl-coumarins
• Benzopyran
• Complexes
• Pd(II) and Pt(II)
• Structure and spectroscopic properties

Acknowledgements

B. Koleva wishes to thank the Alexander von Humboldt Foundation for a Fellowship. R. Nikolova is grateful for the financial support from the Bulgarian National Research Fund.