The magnitude of the optoacoustic effect in aqueous solutions of the styryl dye 4-(E)-2-(3,4-dimethoxyphenyl)ethenyl-l-ethylpyridinium perchlorate in the presence of 0.5 equiv cucurbit8uril (CB8) has been found to depend on the 2 + 2 photocycloaddition reaction, which effectively occurs in the CB8 cavity and serves as an additional nonradiative channel for pump energy conversion in the 418-nm region. Moreover, the fraction of excitation energy converted to heat is three times lower in the presence of CB8 than for solutions of the free dye.
Kryukov et al. (2026) studied this question.