Optical and magnetic studies on the phosphorescent state of phthalazine in polar and non-polar hosts
作者： Seigo Yamauchi , Tetsuo Ueno , Noboru Hirota
DOI: 10.1080/00268978200101012
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摘要: The optical and magnetic properties of the lowest triplet state (T 1) phthalazine were investigated in benzoic acid (BAC), p-dichlorobenzene (DCB) p-dibromobenzene (DBB) by means phosphorescence spectroscopy, ODMR E.P.R. at liquid helium temperatures. Well resolved spectra observed DCB DBB a vibrational analysis was made. transition energies T 2(nπ *) S 1(nπ states estimated from excitation spectra. energy gaps between 1 2 to be 2150, 694 788 cm−1 BAC, DBB, respectively. sublevel schemes zero field splittings (ZFS) determined. changes ZFS on going polar non-polar hosts are discussed terms vibronic spin-orbit interactions with nearby state. most radiative found T2 DCB, but y BAC. This difference is attributed shifts levels reduction ...
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