## Abstract NOED, COSY and HETCOR experiments in conjunction with molecular mechanics calculations, were used to assign the ^1^H and ^13^C NMR spectra of the terpenoids α‐ionone and methyl __O__‐methylpodocarpate and to investigate their stereochemistry. These compounds were used as models to inves
Some aspects of spin-lattice relaxation amongst triplet states of molecules and molecular excitons
✍ Scribed by R.M. Hochstrasser; P.N. Prasad
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 253 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
A numerical estimate of the spin-lattice relaxation in molecular crystals and mixed molecular crystals is presented on the assumption that a direct mixing of the spin-levels arises because of the modulatIcn of the spin-orbit Interaction by the orbit-lattice interaction. The cases of neat and mixed crystals are compared. In the latter case the thermal strain provides the coupling between excitations and the lattice.
📜 SIMILAR VOLUMES
It is shown that the spm-spin and spin-lattice relaxation rates in the lowest triplet state of aniline in a p-xylene host crystal are determmed by the presence of a close-lying local phonon state. It is concluded that the motion of the aniline molecule has a highly localised character.
The three spin-lattice relaxation rates for the triplet state of ncridine in zerc-field have been determined in a biphenyl host from 1.7-3.2 K. The mean relaxation rate for the triplet state of phcnanthrene was determined in a biphenyl host from 1.3-13 K Two conclusions of a more general nature emer
The pulse recovery method is applied to the triplet states of naphthalene, quinoxalene, and tetramethylpyrazine 03iP) in durene and biphenyi host crystals for 1.25% d Td 4.23%. Temperature dependen~es of the spin-lattice relaxation rates are characteristic of Raman and direct processes.
## Abstract Carbon‐13 spin–lattice relaxation times were measured for some penta‐ and tricarbonylchromium complexes of organic ligands. The chemical shift anisotropy of the carbonyl carbons was estimated to be __ca.__ 500 ppm. The contributions of dipole–dipole and chemical shift anisotropy mechani