Turn On/off Fluorescence in the Presence of Zn(ii) and Tb(iii) Metal Ions in The Schiff Base Complex

• DOI: 10.15864/ijcaes.3305
• Publication Date: 2022-05-11T06:27:13Z
• Authors: Nithun Ranjan Pandit; Biplab Biswas; Sandip Paul; Arindam Das; Anjay Majhi; Sunny Goon; Prapti Priyam Han...; Arpita Gucchait .

Zinc is one of the most essential trace elements in periodic table which is directly involved in several enzymatic and biological activities in human body. Research has mainly focused in the catalytic and biological applications of Zinc complex; however the fluorescence property and its co-relation with the 3d and 4f metal ions are hitherto unexplored. In the last decades several fluorescence active Schiff base (H2 L) was synthesised using o-vanillin and ethylene diamine in room temperature stirring. Herein, metal complexes of Zn(II) and Zn(II)-Tb(III) were synthesised and characterized. Photo physical properties of all these complexes were studied using fluorescence spectroscopy. Interestingly it has been found that the Zn(II) complex shows enhanced fluorescence intensity than the other complexes. However, the fluorescence intensity of Zn(II)-Tb(III) complex decreases compare to the Zn(II) complex. The chelation enhanced fluorescence plays the major role for the enhanced fluorescence intensity of the Zn(II) complex however the presence of paramagnetic metal centre in Zn(II)-Tb(III) complex decreases the overall fluorescence intensity as compare to the Zn complex.