Open AccessA semi-empirical estimation of ground and excited state dipole moments of zinc phthalocyanine from solvatochromic shift data
Author(s) -
Abimbola Ogunsipe
Publication year - 2018
Publication title -
international journal of advanced chemistry
Language(s) - English
Resource type - Journals
ISSN - 2310-2977
DOI - 10.14419/ijac.v6i2.11019
Subject(s) - solvatochromism , excited state , dipole , ground state , chemistry , stokes shift , bond dipole moment , transition dipole moment , atomic physics , molecular physics , solvent , physics , fluorescence , quantum mechanics , organic chemistry
A semi-empirical determination of ground and excited state dipole moments of zinc phthalocyanine (ZnPc) from solvatochromic shifts is hereby presented. The ratio of the excited- and ground-state dipole moments of ZnPc ( ) was estimated by a combination of the Bakshiev and the Kawski-Chamma-Viallet’s equations, while the difference in the excited- and ground-state dipole moments (Dm) was estimated usingthe molecular-microscopic solvent polarity parameters ( ), alongside the Stokes’ shifts (Dῡ) in the various solvents. The dipole moment of ZnPc is significantly higher in the excited singlet state (me = 3.12 D) than in the ground state (mg = 1.50 D). Obviously charge separation is greater in the excited state of ZnPc than in its ground state.