Emission amplification of Ru(bpy)32+ via energy transfer from pyrene derivatives on synthesized clay

Light Energy Accumulation from Pyrene Derivative to Tris(bipyridine)ruthenium on Clay Surface

“…The obtained ε value at λ max was close to those of aqueous Ru 2+ (1.42 × 10 4 L mol –1 cm –1 at 453 nm) and Ru 2+ /SSA (1.43 × 10 4 L mol –1 cm –1 ). , Representative absorption spectra of An-Py 2+ /Ru 2+ /SSA with adsorbed amounts of An-Py 2+ and Ru 2+ of 25% CEC are shown in Figure (blue line). Based on area coverage, the SSA surface was almost fully covered by An-Py 2+ and Ru 2+ under these conditions (Ru 2+ and An-Py 2+ = 25% CEC) . The absorption spectra of An-Py 2+ /SSA and Ru 2+ /SSA and the calculated spectrum (simple sum of those of An-Py 2+ /SSA and Ru 2+ /SSA) are illustrated in Figure (green line) as a comparison.…”

“…The normalized emission spectrum of independently prepared An-Py 2+ on SSA (An-Py 2+ /SSA, An-Py 2+ = 0.1% CEC) and the absorption spectrum of Ru 2+ on SSA (Ru 2+ /SSA, Ru 2+ = 25% CEC) are shown in Figure S1. The spectral overlap integral ( J ) was estimated to be 1.7 × 10 14 M –1 cm –1 nm 4 , which is approximately twice those observed in earlier studies for Py 4+ /SSA and Ru 2+ /SSA systems. , This J value suggests efficient energy transfer from An-Py 2+ to Ru 2+ on SSA. The absorption spectra and corresponding Lambert–Beer plot of An-Py 2+ /Ru 2+ /SSA at the maximum absorption wavelength (λ max ) of the Ru 2+ component (454.5 nm) with different loading amounts of Ru 2+ (Ru 2+ = 0–25% CEC) are shown in Figure S2.…”

“…The quantitative adsorption of both An-Py 2+ and Ru 2+ onto SSA was confirmed by filtration, i.e., neither dye was detected in the filtrate solutions by absorption measurements. Further experimental details, analytical methods, and materials have been reported in previous papers. ,, …”

“…To obtain efficient and effective photoreaction systems, a combination of Ru 2+ and an ordinary organic molecule that has strong light absorption and light energy accumulation properties is expected to provide a solution. Pyrene derivatives are promising organic molecules for this purpose because they exhibit intense absorption and a high emission quantum yield and consist of common atoms. − We have reported efficient energy transfer from a light-absorbing and energy-donating cationic pyrene derivative (Py 4+ ) to energy-accepting Ru 2+ on a synthetic clay (Sumecton SA [SSA]) , surface. , In this case, the emission from Py 4+ was quenched and an apparent emission quenching rate constant ( k q,app ) of 7.4 ± 0.7 × 10 15 L mol –1 s –1 was achieved . However, this system requires stoichiometric amounts of Py 4+ and Ru 2+ to achieve emission quenching of ca.…”

Oxygen Sensing by the Hybrid Langmuir-Blodgett Films of Iridium(III) Complexes and Synthetic Saponite on the Basis of Energy Transfer

“…The hybridization of an amphiphilic Ir(III) complex with various kinds of clay minerals was investigated [16,[22][23][24]. In the case of synthetic saponite, for example, the emission was enhanced through the hybridization [25][26][27][28][29]. Similar enhancement was also realized by adsorbing Ir(III) complexes on a colloidal particle of synthetic saponite [30,31].…”