Laser-induced fluorescence spectroscopy of jet-cooled phenylcarbazole and a weakly bonded carbazole—benzene complex

✍ Scribed by Haiping Yu; Sharifuddin M. Zain; Ilya V. Eigenbrot; David Phillips

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 609 KB
• Volume: 202
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85363-s

✦ Synopsis

Laser-induced fluorescence (LIF) excitation spectra of phenylcarbazole and a weakly bonded carbazole-benzene complex are presented. A prominent long progression with up to 7 quanta transitions was assigned to the intermolecular bending vibration B in the complex between the carbazole and benzene moieties. Bands corresponding to up to 6 quanta transitions with a similar but slightly weaker intensity profile distribution to g was found to arise from the "hot band" of the complex. The LIF excitation spectrum of phenylcarbazole resembles closely that of carbazole and the cyanophenylcarbazole chromophores. The emission spectrum following the excitation of the origin is a good mirror image of that of the excitation, and results in little or no change of geometry of the molecule on going from the ground state to the electronically excited state. The two aromatic ring planes in phenylcarbazole are orthogonal to each other with Clv symmetry. The emission spectra following excitation of other vibronic modes with up to 800 cm-' excess energy above S, are presented.