The oxinates of Co(III), Rh(III) and Ir(III) were prepared in relatively high cis/trans isomer ratios. These isomers were separated by silica gel column chromatography and characterized by TLC, HPLC, elemental analyses and proton NMR. The existence of the expected trans and cis structural isomers for trivalent metal oxinates was conclusively demonstrated.
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Wei Cheng (1983) studied this question.
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