Spectroscopic study of carbenes in low-temperature matrices
The review surveys and gives a systematic account of the literature data on the IR and UV spectroscopic studies on carbenes in low-temperature matrices. The methods of generation and isolation of carbenes in inert matrices at temperatures around 10 K are examined. The possibility of applying the data obtained to the study of the structure of carbenes and to the determination of the mechanisms of reactions involving them is demonstrated. The bibliography includes 67 references.
Chemosensory devices with self organized structures and artificial receptors are developed for a wide field of applications. Supramolecular hosts, highly ordered liquid crystal phases and even Langmuir Blodgett films are promising recognition elements. Cage compounds such as tert- butyl-calix[n]arene show high preorganization due to their rigid walls and form highly symmetrical cavities suitable for host guest inclusion of analytes. Disturbance of the highly ordered cholesteric and nematic phases influences the optical and dielectric properties of these materials.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.