Orientational behavior of C70 molecules in chlorobenzene
โ Scribed by Igor V. Rubtsov; Dmitrii V. Khudiakov; Alexander P. Moravskii; Victor A. Nadtochenko
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 257 KB
- Volume
- 249
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
โฆ Synopsis
The orientational behavior of C70 singlet excited molecules in a chlorobenzene solution has been measured at room temperature by the picosecond transient grating technique. A two-stage decay signal was observed: a fast part (~-= 12 + 5 ps) which is comparable with the corresponding signal of C6o in chlorobenzene (r = 8 _ 2 ps), and a slow part (~-= 30 + 5 ps). The data obtained are analyzed in terms of the rotation of C7o molecules. The influence of the dielectric friction on the C7o rotation is reported.
๐ SIMILAR VOLUMES
Variable-temperature X-ray diffraction studies of CT0 suggest the occurrence of two phase transitions around 350 and 280 K where the hi&temperature phase is fee and the low-temperature phase is monoclinic, best described as a distorted hcp structure with a doubled unit cell, two like-phases (possibl
Infrared spectroscopic studies of C,O films show variation in absorbance and linewidth of the bands across the orientational phase transitions around 280 and 340 K. There is some evidence for the coexistence of phases in the 210-270 K region and for the occurrence of another transition below 200 K.
A new method of studying orientational correlations in liquids of linear molecules is presented and applied to Nz, Fl, Cl,, Br,, Is, CO\* and C& near their triple points. The method is based on the subdivision of the total angular space of a pair of molecules into a complete set of disjoint classes
The high symmetry of the C6,, molecule and the symmetry of the cubic lattice site in solid ChO imply that in addition to the known orientational phase transition at 250 K, there is a sequence of transitions at lower T. These transitions correspond to a successive freezing of orientational degrees of