Photoreactive Helical Nanoaggregates Exhibiting Morphology Transition on Thermal Reconstruction

Overview

Journal Nat Commun

Specialty Biology

Date 2015 Nov 21

PMID 26586298

Citations 17

Authors

Mitsuaki Yamauchi

Tomonori Ohba

Takashi Karatsu

Shiki Yagai

Affiliations

Soon will be listed here.

Abstract

The supramolecular design of photochromic molecules has produced various smart molecular assemblies that can switch their structures and/or functions in response to light stimuli. However, most of these assemblies require large structural changes of the photochromic molecules for an efficient conversion of assembled states, which often suppresses the photoreactivity within the self-assemblies. Here we report molecular assemblies, based on a photo-cross-linkable chromophoric dyad, in which a small amount of ultraviolet-generated photochemical product can guide the entire system into different assembly processes. In apolar solution, the intact dyad self-assembles into right-handed superhelical fibrils. On ultraviolet-irradiation of these fibrils, an effective photoreaction affords a sole photo-cross-linked product. When right-handed helical fibrils, containing a minor amount of the photoproduct, are thermally reconstructed, the intact molecule and the photoproduct undergo a co-assembly process that furnishes superhelical fibrils with different molecular packing structures. This molecular design principle should afford new paradigms for smart molecular assemblies.

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