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Photoresponsive Nano-Coumarin with Indole Auxin Hormone

In this work, we designed and synthesized two photoresponsive materials with 3-indoleacetic acid (IAA) plant hormone which can be monitored from the photoreposive properties of coumarin. The varied position of the long alkoxy side chain (-OC16H33) was purposely introduced to adhesive on the plant leaves. Two coumarin-caged nanomaterials showed average particle diameter about 400 nm and gave the maximum emission wavelength at 425 and 450 nm. The formulated nanoemulsion showed good wettability (θ=48o) with Cassia fistula leave surface. Interestingly, CM2 gave the short photoresponse of photolysis within one day.