Optical Properties of Chiral Azo-Schiff Base Mn(II) and Zn(II) Complexes with Silver Nanoparticles

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.

Photofunctions in Hybrid Systems of Schiff Base Metal Complexes and Metal or Semiconductor (Nano)Materials

“…Saiga et al [ 63 ] have prepared hybrid materials of new chiral azo-Schiff base Mn(II) and Zn(II) complexes adsorbed at silver nanoparticles or TiO 2 ( Figure 10 ). They investigated their chiroptical properties.…”

Optical Properties of AgNPs and BiPO4 :Pr(III) Phosphor and Comparative Studies of Albumins (Local Eggs, Mizoram)

“…Quantum dots and other nanomaterials with diameters smaller than 10 nm are also popular topics of study because of their exceptional optical and physicochemical characteristics and diverse range of uses. Some AgNP-containing compounds showed longer fluorescence lifetimes than only AgNP-free complexes (4)(5)(6) . ZnO, TiO 2 , and CuO nanoparticles have received a lot of attention in recent years due to their outstanding performance in a variety of sectors, including photocatalysis, sensors, quantum dots, bio-medical applications, and others (7,8) .…”