Transient luminescence spectroscopy of dialkylRu(bpy)₃²⁺-citratoperoxotitanate-dialykylviologen triad LB film deposited on quartz slab waveguide

Abstract

Amphiphilic Ru(bpy)₃²⁺ complex (DC₁₇Ru)—citratoperoxotitanate (CPT) —ditetradecylviologen (DC₁₄V) triad nano-film was fabricated on quartz slab optical waveguide by organic-inorganic hybrid Langmuir-Blodgett method. Transient phosphorescence of the DC₁₇Ru monolayer at 610 nm excited by 532 nm pulsed laser was observed by SOWG spectroscopy. The phosphorescence was partly quenched by the CPT layer and the quenching was enhanced by the DC₁₄V monolayer underneath the CPT layer in the DC₁₇Ru-CPT nano-film. Energy levels of the components, DC₁₇Ru, CPT and DC₁₄V suggests an exergonic cascade electron transfer mechanism from the excited state of DC₁₇Ru to DC₁₄V via the CPT.

Keywords:

• Alkyl viologen
• Langmuir-Blodgett film
• ruthenium trisbipyridine complex
• slab optical waveguide
• transient phosphorescence

Additional information

Funding

This work was supported by Grant-in-Aid for Challenging Exploratory Research under Grant No. 26620026; and by Grant-in-Aid for Scientific Research on Innovative Areas 2406, Artificial Photosynthesis (An Apple) under Grant No. 25107514 from the Japan Society for the Promotion of Science (JSPS).