Ray–Dutt twist

The Ray–Dutt twist is a mechanism proposed for the racemization of octahedral complexes containing three bidentate chelate rings. Such complexes typically adopt an octahedral molecular geometry in their ground states, in which case they possess helical chirality. The pathway entails formation of an intermediate of C2v point group symmetry.[1] An alternative pathway that also does not break any metal-ligand bonds is called the Bailar twist. Both of these mechanism product complexes wherein the ligating atoms (X in the scheme) are arranged in an approximate trigonal prism.

This pathway is called the Ray–Dutt twist in honor of Priyadaranjan Ray and N. K. Dutt, the inorganic chemists who proposed this process.[2]

See also


  1. Ray, P.; Dutt, N. K. (1943). "Kinetics and Mechanism of Racemization of Optically Active Cobaltic Trisbiguanide Complex". J. Indian Chem. Soc. 20: 81–92.
  2. A. Rodger, B. F. G. Johnson (1988). "Which is more likely: the Ray–Dutt twist or the Bailar twist?". Inorganic Chemistry. 27 (18): 3061–3062. doi:10.1021/ic00291a001.
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