Fe(phen) 3 2+ ‐Modified Zeolite Particles and Their Energetic Studies

Chemically modified zeolite Y (NaY) particles and their resulting modified electrodes were prepared with acridinium (AcH+), iron(II) and 1,10‐phenanthroline (phen) for energetic studies. According to diffuse reflectance absorption spectroscopy and cyclic voltammetry, AcH + and Fe(phen) 3 2+ were successfully entrapped in the zeolite particles. Transient emission spectra measurements showed that the life time of AcH+* in the zeolite particles (to 35 ns; λ ex 365 nm; λ em 500 nm) was greatly reduced upon incorporating Fe(phen) 3 2+ and Fe 2+ . The fast de cay of AcH+*(NaY) suggested that a reductive quench was likely to take place in the zeolite particle. Probably due to a size‐exclusion effect, the bulky electron donor, N, N‐diethyl‐2‐methyl‐1,4‐phenylenediamine (DEPD), revealed a difficulty in reaching the photosensitizer, AcH + , in side the zeolite particle. As a consequence, the in significant photocurrent for the oxidation of DEPD was from the NaY|AcH + electrode. However, if Fe 2+ and Fe(phen) 3 2+ were incorporated, the photocurrent would become more significant. Closer examinations, in addition, showed that the photooxidaton of DEPD occurred more rapidly on the NaY|AcH + |Fe(phen) 3 2+ electrode, compared to the NaY|AcH + |Fe 2+ electrode. This difference apparently results from a greater gap in energetics between DEPD and Fe(phen) 3 3+ (NaY) than that between DEPD and Fe 3+ (NaY) . Due to this effect, a greater amount of indophenol blue, derived from the coupling reaction of the oxidized DEPD with 1‐naphthol, was formed and de posited on the NaY|AcH + |Fe(phen) 3 2+ modified electrode. Thanks to this photo‐induced charge‐transfer reaction, the NaY|AcH + |Fe(phen) 3 2+ particle showed an application potential in image recording.