Synthesis Characterization and Photophysical Investigation of Aggregated Electron Rich Zinc Phthalocyanine

Abstract

Zn-Phthalocyanine is well known for its chemical and thermal stability. In the present work, we have synthesized an electron-rich tetra carboxyl substituted Zn-Phthalocyanine derivative possess S atom. The synthesis is carried out by employing phthalimide as starting material. The final ZnPc derivative was synthesized by employing hexamethyl disilazane (HMDS) as the nitrogen source, which involves the cyclization of phthalonitriles co-ordinated by zinc metal ion. The synthesized molecules were characterized by IR, NMR and HR-MS spectroscopy techniques. Absorption, fluorescence and time-correlated single photon counting studies were carried out. Aggregation of ZnPc in DMF was revealed from absorption spectral studies. Singlet and triplet quantum yields were calculated. Further transient absorption studies were also carried out for triplet lifetime.

STUDY OF AGGREGATION BEHAVIOR AND ELECTRON INJECTION PROCESS OF THIOL SUBSTITUTED ZnPHTHALOCYANINE DERIVATIVE ON TIO2 NANOPARTICLE SURFACE

“…The synthesis, characterization and photophysics of TCTZnPc derivative are already reported by our group. 14 TCTZnPc dye coated nanocrystalline TiO2 film was prepared by following the procedure as reported earlier. 15…”

“…The changes in adsorption geometry of adsorbed dye molecules and/or molecular energy levels due to the aggregation, leads to the lower power conversion efficiency. 14 It is well established that the phthalocyanine dyes exhibit strong aggregation and this restricts the application of those dyes and its derivatives in DSSCs, although they exhibit a strong near IR absorption, and chemical and thermal stability. 15,16 The phthalocyanine tends to form strong aggregation in solution and on films, which in turn to limits the excited state lifetime and device efficiency.…”

VALENCE BOND SUMS IN COORDINATION CHEMISTRY: CALCULATION OF THE OXIDATION STATE OF NICKEL IN NiS2P2 CHROMOPHORES BY USING A NEW VALENCE BOND PARAMETER

“…Metal complexes have attracted significant attention because they have tremendous potential application in biology and light emitting devices 1,2 . The use of the valence bond sum (VBS) method in understanding the bonding in metal complexes shows promise 3 .…”