The near ultra-violet spectrum of tropolone vapour and its relevance to the molecular structure
| Autor: | J.M. Hollas, A.C.P. Alves |
|---|---|
| Rok vydání: | 1972 |
| Předmět: | |
| Zdroj: | Molecular Physics. 23:927-945 |
| ISSN: | 1362-3028 0026-8976 |
| DOI: | 10.1080/00268977200100931 |
| Popis: | The two most intense bands of the 370 nm electronic band system of tropolone have been rotationally analysed. They are separated by 18·93 cm-1 and it has been shown that the high wavenumber band is the 0--0- (H1 1) transition in what is almost certainly the internal hydrogen-bonding vibration v H : the low wavenumber band is the 0+-0+ (00 0) transition. A rotational contour analysis of both bands shows that there is an intensity alternation in K a″ such that the ratio K a″ even : odd is 10 : 6 in the 0+-0+ band and 6 : 10 in the 0--0- band. The intensity alternation, the nearly equal intensities of the 0+-0+ and 0--0- bands, the separation of these two bands and the anharmonic behaviour of v H show that the separation of the 0+ and 0- levels is small in the ground electronic state (probably less than 50 cm-1) and is 18·93 cm-1 larger in the excited electronic state. The 0+-0+ and 0--0- bands are both type B showing that the electronic transition is A 1 B 2-X 1 A 1 and therefore π*-π rather than π*-n. The ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|