Synthesis of New Porphyrin Complexes: Evaluations on Optical, Electrochemical, Electronic Properties and Application as an Optical Sensor

Abstract

This work reports on the synthesis, characterization and application as an optical sensor of two new porphyrin complexes namely :(Hexamethylenetetramine)(meso-tetratrifluoromethylphenylporphyrinato) zinc(II) [Zn(TFMPP)(HMTA)] and (Hexamethylenetetramine)(meso-tetra-tert-butylphenylphenylporphyrinato) Zinc(II) [Zn(TtBuPP)(HMTA)]. The chemical structures of these species were defined by 1HNMR and FT-IR spectroscopic analysis. The optical properties of these π-conjugated systems were investigated by UV-visible, absorption and photoluminescence spectroscopy. The UV-visible titrations show that the Soret and Q bands of the new complexes are red-shifted compared to those of the starting material species [Zn(TFMPP)] and [Zn(TtBuPP)] and the association constants (Kas) was found to be depending on the withdrawing-donating effects of the substituents on the phenyls ring of the meso-porphyrins. The electrochemical behavior was also investigated and the optical and electrochemical energy gaps were determinate. The electronic properties of the ITO/Pi/Al have been defined by I–V characteristics and impedance spectroscopy measurements.