Evaluation of Ground and Excited State Dipole Moments of 2(3)-tetra(tert-butylphenoxy)phthalocyaninato Zinc(II) from Solvatochromic Data

Abstract

This article presents a semi-empirical determination of ground state dipole moment (m_g) and excited state dipole moment (m_e) of 2(3)-tetra(<em>tert</em>-butylphenoxy)phthalocyaninato zinc(II) (ZnTBPc) using the solvatochromic shift method, which is based on the Onsager's reaction field theory. A combined application of the Bakshiev's equation and the Kawski-Chamma-Viallet's equation was used to determine the ratio m_e/m_gwhile the use of the molecular-microscopic solvent polarity parameter yielded the term Dm (m_e- m_g). The dipole moment of ZnTBPc in its excited singlet state (m_e=4.46D) is more than twice as much as that in its ground state (m_g=2.14D).These values suggest that the higher charge separation is greater in the excited state of ZnTBPc than in its ground state.<br /><br />