Synthesis, Photophysical, and Electrochemical Characterization of Coumarin-Chalcone Derivatives and Their Al(III), Fe(III), Ni(II), and Zn(II) Complexes.
Two new chalcones derived from coumarin and their corresponding Al(III), Fe(III), Ni(II), and Zn(II) complexes were synthesized. UV-visible absorbance spectra showed ligand-centered π → π* transitions, reducing optical band gaps from 3.20 eV for parent coumarin to 2.94-3.16 eV after conjugation. Solvent polarity also a...