Abstract

Carbon-13 magnetic resonance spectroscopy is shown to be a viable tool in differentiating geometric isomers of the type, cis- and trans-Rh(en) 2XY n*. The Rh(en) 3+ 3 ion and the trans-Rh(en ) 2XC1 n+ ions (where X = Cl, OH 2 and NH 3) display only one proton-decoupled C-13 signal. The cis complex ions, cis-Rh(en) 2XCl n+, display between two (X = Cl) and four (X = OH 2, NH 3) 13Cc peaks. The configurational changes of the individual chelate rings (λ ⇌ δ) appear to be fast on the nmr time scale. The splitting pattern and chemical shifts have enabled us to assign a cis configuration to the Rh(en) 2(enH)Cl 3+ product formed from photolysis of Rh(en) 3+ 3 in 1M HCl. The results reported herein will be compared and contrasted to earlier synthetic and 13C nmr studies.

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