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http://nopr.niscpr.res.in/handle/123456789/26065| Title: | A study on equilibrium and kinetics of carbocation-to-carbinol conversion for di- and tri- arylmethane dye cations in aqueous solutions: Relative stabilities of dye carbocations and mechanism of dye carbinol formation |
| Authors: | Gupta, Susanta K Sen Mishra, Sangeeta Rani, V Radha |
| Issue Date: | Jul-2000 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Arylmethane dye cations form a structurally interesting set of stable carbocations. A detailed study on rate-equilibria of carbinol formation from two diarylmethane and nine triarylmethane dye carbocations in aqueous solutions has been carried out using spectrophotometric measurements. The conclusions reached are : (i) The stability order found (auramine O>crystal violet = methyl violet > victoria blue R > victoria pure blue BO = ethyl violet > pararosaniline > brilliant green > malachite green> carbocation form of Michler's hydrol > methyl green), seems to be determined by an interplay of dye carbocation / carbinol conformation and stereoelectronic effects of substituents; and (ii) carbinol formation is general base catalysed and occurs by the rate determining attack of a H2O molecule on the dye carbocation centre via two kinetic pathways one mediated by another H2O molecule and the other by a OH- ion. |
| Page(s): | 703-708 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.39A(07) [July 2000] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 39A(7) 703-708.pdf | 3.16 MB | Adobe PDF | View/Open |
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