A Spectroscopic Study of Charge Transfer Complexes of Tetraphenylporphyrin

Summary.

The fluorescence quenching and complexation behaviour of tetraphenylporphyrin (TPP) with some organic acceptors such as chloranilic acid (CHL), 5,5′-dithiobis-2-nitrobenzoic acid (DTNB), or 3,4-dinitrobenzoic acid (DNB) and tetravalent metal ions such as Th⁴⁺ and Zr⁴⁺ have been studied in methanol. The second-order fluorescence quenching rate constant (k_q), the association constant (K), the molar absorption coefficient (ɛ), and the thermodynamic parameters of the complexation process (ΔG°, ΔH°, and ΔS°) have been evaluated using different organic solvents.