Interactions between protonated retinal schiff base and various counter ions: A study by two-dimensional NOE NMR spectroscopy
✍ Scribed by Rodolfo Ghirlando; Elisha Berman; Timor Baasov; Mordechai Sheves
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 397 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Using two-dimensional NMR spectroscopy, the spatial location of various carboxylate anions relative to the polyene chain of the protonated Schiff base of all-trans-retinal was determined. The observed intermolecular NOE cross-peaks between a proton on the counter ion and a proton near the nitrogen atom indicate the existence of ion-pair formation between the protonated retinal Schiff base and various counter ions in chloroform. The results suggest that the most likely site of the carboxylate group of the counter ion is in the immediate vicinity of the positively charged nitrogen atom of the retinal Schiff base.