Tetra (4-propargyloxyphenoxy) phthalocyanines: Facile synthesis, fluorescence and thermal properties

6^th International Conference and Exhibition on Materials Science and Chemistry

May 17-18, 2018 | Rome, Italy

Daniel Mwanza, Samson Khene and Philani Mashazi

Copperbelt University, Zambia

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

The facile method of synthesizing terminal alkynyl (C=C) functionalized metal tetra (4-propargyloxy phenoxy) phthalocyanines (MTPrOPhOPc) is reported. The synthesized complexes are the metal-free (H2TPrOPhOPc), cobalt (CoTPrOPhOPc) and manganese (Mn(OAc)TPrOPhOPc) phthalocyanines as shown in Figure 1. Phthalocyanines� interesting properties have motivated their wide industrial applications such as building blocks in medicinal applications as photosensitizers, electrocatalysts in chemical sensors, liquid crystals, nonlinear optical materials and molecular devices. This work investigated the use of propargyl bromide to achieve the 4-(4-propargyloxy)phenoxy functionalised phthalocyanine complexes. The fluorescence lifetimes for the H2TPrOPhOPc and Mn(OAc)TPrOPhOPc, evaluated using time correlated single photon counting (TCSPC) technique, were found to be 5.79 ns and 5.50 ns, respectively. The correlation lifetimes were also investigated and found to be 0.74 ns and 0.71 ns for H2TPrOPhOPc and Mn(OAc)TPrOPhOPc, respectively. The CoTPrOPhOPc and Mn(OAc)TPrOPhOPc exhibited excellent thermal stability, which was better than H2TPrOPhOPc, due to the presence of the cobalt and manganese metal ions at the centre of the phthalocyanine ring. Density functional theory (DFT) calculations predicted the HOMO�LUMO (lowest unoccupied molecular orbitals) gap of H2TPrOPhOPc, CoTPrOPhOPc and Mn(OAc)TPrOPhOPc to be 2.06 eV, 2.15 eV and 1.75 eV respectively. g14m8712@gmail.com