Abstract
The π spacer-acceptor (A) pair may play an important role in tuning properties of organic dyes. Hence, we developed alkyne-rhodanine-3-acetic acid (yne-rda) containing dyes with carbazole as a donor (D) unit. Out of the two developed isomeric dyes (RD1 and RD2), RD1 possesses the D-π-A design whereas, RD2 is having π-D-A structure. By employing various spectroscopic and computational techniques, the optical properties of these dyes were studied, and we found that electron transfer (ET) from synthesized dyes to TiO2 nanoparticles (NPs) is feasible. Furthermore, the femtosecond transient absorption measurements provided evidence of ET from dyes to TiO2 NPs.
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