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 C_2v 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 (not Prafulla Chandra Ray) and N. K. Dutt, inorganic chemists at the Indian Association for the Cultivation of Science abbr. IACS[2] who proposed this process.[3][4][5][6]

Ray-Dutt mechanism.

See also

• Pseudorotation
• Bailar twist
• Bartell mechanism
• Berry mechanism
• Fluxional molecule
• Indian Association for the Cultivation of Science (IACS)

References

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. "Indian Association for the Cultivation Of Science". iacs.res.in. Retrieved 2021-10-01.
3. 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.
4. & BANERJEA, D. (1990). Life and works of Priyadaranjan Ray. Journal of the Indian Chemical Society, 67(4):295–309.
5. "Indian Association for the Cultivation of Science: Annual Report For 1953–54". Nature. 174 (4428): 495–496. 1954-09-01. Bibcode:1954Natur.174..495.. doi:10.1038/174495a0. ISSN 1476-4687.
6. Indian Association for the Cultivation of Science: Annual Report for 2018-19. 2019. p. 09.