Sifat Foto-Kimia Kompleks Molibdenum Ditiolena

The important factors for a good photosensitizer are intensity and position of the spectral absorption in visible region, redox potentials and photo-stability. Molybdenum dithiolene complexes with a general formula [MoTp*(NO)(L)] where Tp* = tris(3,5-dimethylpyrazolyl)hidroborate and L = toluene-3,4-dithiolate (L1); 1,2-benzenedithiolate (L3); 3,6-dichloro-1,2-benzenedithiolate (L3) were found to exhibit the required chemical and physical properties as an anode for photo-electron-sensitizer to generation hydrogen and oxygen via water splitting in photo-electrochemical cell. Mo-dithiolene complexes were synthesized from the precursor [MoTp*(NO)(I)2] and dithiol compound in the presence of Et3N as reducing and deprotonating agents. These complexes were characterised by micro-elemental analysis for CHNS, infrared and UV-Vis spectroscopy, and electrochemical analysis. UV-Vis absorption peaks were detected at 321-331, 369-372, 576-589, 736-741 nm (ëmax/ nm). The photo-chemical and photo-physical reactivities were studied to determine the suitability of these complexes as photosensitizers in photo-electrochemical cells. The photo-stability test showed no significant degradation of the complexes after 24 h of light illumination.