PROTON NUCLEAR MAGNETIC RESONANCE STUDIES OF 8-QUINOLINOL AND SEVERAL OF ITS METAL COMPLEXES

The proton NMR spectrum for 8-quinolinol has been analyzed and assigned with the aid of computer techniques and substituted derivatives of oxine. NMR spectra also have been recorded for the oxine chelates of Pt(ll), Zn(ll), Mg(II), Sn(ll), Pb(ll), Hg(ll), Al(lll), Co(lll), and Rh(lll) in dimethylsulfoxide. Consideration of the chemical shift changes of the phenolic-ring and hetero-ring protons of the ligand in the metal chelates relative to their positions for the free ligand provides a measure of the strength (or lability) of the coordinate bonds to the oxygen and nitrogen atoms of the ligand. Structures for the metal complexes are proposed which are consistent with the experimental data. © 1968, American Chemical Society. All rights reserved.