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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
Synthesis and photochemical properties of a new molybdenum porphycene complex
Daisuke Maeda1, Hisashi Shimakoshi, Masaaki Abe
1Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
Abstract:
A new molybdenum porphycene complex, which is a new complex having oxo and chloro groups at the axial positions, was successfully synthesized. This chloro(oxo)molybdenum(v) complex, [Mo(V)(OEPc)(O)Cl] (1) has strong absorption bands in the visible region attributed to the properties of the porphycene and is very attractive from a photochemical viewpoint. This complex was readily reduced from Mo(v) to Mo(iv) species to yield [Mo(IV)(OEPc)(O)] under anaerobic irradiation by visible light. This photochemical reaction mechanism is derived from the homolytic cleavage of the axial ligand. Furthermore, this photochemical reduction proceeded very effectively compared to that for the corresponding porphyrin complex.
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Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
