Metal Complexes of 3-(Quinolin-2-Ylmethylene)isoindolin-1-One: Synthesis, Experimental and Theoretical Investigation of Spectral Characteristics, Electrocatalytic Properties

Complexes of 3-(quinolin-2-ylmethylene)isoindolin-1-one with metal salts were synthesized in a 1:1 ratio with Zn(II), Co(III), Cu(II), and Ni(II). Their composition and structure were confirmed by mass spectrometry, vibrational spectroscopy, and H NMR spectroscopy. DFT calculations showed that the positions of the vibrational bands depend on the geometric structure of the complexes. Using TD-DFT calculations, the absorption bands in the electronic spectra of the synthesized complexes were assigned to specific electronic transitions. The cobalt and copper complexes exhibit catalytic activity in the electroreduction of oxygen.