Abstract
Proton magnetic resonance spectra of several mono and bis(β-diketone)cobalt(III) complexes have been measured and the chemical shifts of the methyl and methine protons determined. The complexes examined included: [Co en 2dik] 2+ where dik equal substituted acetylacetonate anions; cis and trans[Co acac 2NO 2 L] where L equal alkylamines and substituted pyridines; and cis and trans[Co acac 2 L 2] +(−) where L 2 equal bidentate amines, ammonia and nitrite ion. The variation in chemical shift with the various ligands was several times greater for the methine than for methyl protons. The large variation in chemical shift with β-diketone substituent can be related to inductive effects and magnetic shielding effects. The much smaller variation of the chemical shift with other ligands can be rationalized by invoking magnetic anisotropy effects of the ligands. Electric field and cis and trans effects were found to be small.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call