Polarization-Dependent Thin Films with Biaxial Anisotropic Absorption Constructed by a Single Coating and Subsequent Topochemical Polymerization of Chromophores

Abstract

For the construction of hierarchical superstructures with biaxial anisotropic absorption, a newly synthesized diacetylene-functionalized bipyridinium is self-assembled to use an electron-accepting host for capturing and arranging guests. The formation of the donor−acceptor complex triggers an intermolecular charge transfer, leading to chromophore activation. Polarization-dependent multichroic thin films are prepared through a sequential process of single-coating, self-assembly, and topochemical polymerization of host−guest chromophores. Molecular packing structures constructed in the single-layer optical thin film possess orthogonal absorption axes for two different wavelengths. By tuning the linear polarization angle, the color of the optical thin film can be intentionally controlled. This single-layered multichroic film provides a new pathway for the development of anticounterfeiting and multiplexing encryptions.

ON–OFF Control of Marangoni Self‐propulsion via A Supra‐amphiphile Fuel and Switch

“…Compared with conventional covalent surfactants, supraamphiphiles have non-covalently linked hydrophilic and hydrophobic parts with reversibility, [22] and thus allow for stimulus-responsive control over the formation and dissociation of supra-amphiphiles via pH, [23,24] heat, [25] light, [26][27][28][29] gas [30] etc., leading to adjustable surface activity. This dynamic characteristic meets the need in both eliminating saturated interfacial adsorption and controlling the motion status in Marangoni self-propulsion.…”

Topochemical cross-linking of diacetylene in a highly interpenetrated three-dimensional covalent organic framework

“…4 Based on the principles of crystal engineering and supramolecular chemistry, the most topochemical polymerizations of diacetylene can occur within preassembled acyclic/macrocyclic molecular crystals. 5 Nonetheless, the design of such molecular crystal frameworks involves the utilization of various non-covalent interactions to position the molecules towards the appropriate direction, 6 thereby, possessing a certain degree of randomness and unpredictability (Fig. 1).…”