NEW CHROMOGENS OF FERROIN-TYPE .4. OXIMES OF SUBSTITUTED METHYL AND PHENYL 2-PYRIDYL KETONES

The spectral characteristics, and solution conditions requisite for formation, of the iron(II), cobalt(II), and copper(I) chelates of some newly synthesized oximes containing the ferroin functional grouping have been determined. For some of the oximes, both syn- and anti-isomers were available for study. NMR spectra of the isomers differed, enabling structural distinctions to be made. None of the anti-isomers formed coloured metal chelates. A practical method for distinguishing between the isomers can be based on these findings. Two of the compounds proved very promising as highly sensitive chromogens for determining iron in strongly alkaline materials. © 1969.