✦ LIBER ✦
CIDNP study of quenching processes of excited xanthene dyes by aromatic amines
✍ Scribed by K. A. Muszkat; I. Khait
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Weight
- 283 KB
- Volume
- 88
- Category
- Article
- ISSN
- 0037-9646
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✦ Synopsis
Abstract
Strong proton nuclear polarization is produced by the quenching of excited triplet state Rose Bengal molecules by aromatic amines. In secondary amines significant polarization (but no permanent chemical change) is observed in the ring ortho and para protons and in the N‐alkyl α methylene (or methyl) protons. In this case the operation of a highly reversible hydrogen atom transfer quenching mechanism is indicated. Tertiary aromatic amines give polarized unstable intermediates for which the perpendicular aromatic ring structure is suggested.