Abstract
Herein we have originally designed chiral azo-salen Mn(II) and Zn(II) complexes for interacting silver nanoparticles (AgNPs) exhibiting localized surface plasmon resonance (LSPR). Understanding excited state and reaction intermediate during light irradiation to return to ground state may be important for such composite systems. Therefore, we investigated such optical properties for systems using time-resolved luminescence and transient absorption measurements. DMSO solutions of the four newly prepared and characterized complexes (MMn, MZn, CMn, and CZn) and ethanol solutions of the composite materials of each complex with AgNPs were served for optical measurements. The time-correlated single photon counting (TCSPC), the streak camera which is much shorter period of time than TCSPC and transient absorption measurement, was performed for the eight samples. The fluorescence lifetime of the sole complexes and the composite materials with AgNPs was derived from curve-fitting analysis of luminescence decay curves of TCSPC. Lifetime of the composite systems with AgNPs was longer than that of the corresponding sole metal complexes for three cases. It was revealed that composite systems may go through three reaction intermediates during relaxation from excited state to ground state.
Highlights
In recent years, we have carried out photochemical studies on chiral azo-Schiff base metal complexes as hybrid materials, for example, focusing on cis-trans photoisomerization of azobenzene moiety [1], non-linear optical effect of chiral molecules [2], induced circular dichroism (CD) as supramolecular chiroptical measurements of chiral molecules [3] [4] and polarized light control of molecular orientation on the surface resulted from induced CD due to Weigert effect of azobenzene moiety [5]
Understanding excited state and reaction intermediate during light irradiation to return to ground state may be important for such composite systems
We have carried out photochemical studies on chiral azo-Schiff base metal complexes as hybrid materials, for example, focusing on cis-trans photoisomerization of azobenzene moiety [1], non-linear optical effect of chiral molecules [2], induced circular dichroism (CD) as supramolecular chiroptical measurements of chiral molecules [3] [4] and polarized light control of molecular orientation on the surface resulted from induced CD due to Weigert effect of azobenzene moiety [5]
Summary
We have carried out photochemical studies on chiral azo-Schiff base metal complexes as hybrid materials, for example, focusing on (with titanium oxide) cis-trans photoisomerization of azobenzene moiety [1], non-linear optical effect of chiral molecules [2], (with gold nanoparticles) induced circular dichroism (CD) as supramolecular chiroptical measurements of chiral molecules [3] [4] and polarized light control of molecular orientation on the surface resulted from induced CD due to Weigert effect of azobenzene moiety [5] In this way, we attempted new mechanisms to improve the performance of DSSC in future.
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