Photomechanical behavior triggered by [2 + 2] cycloaddition and photochromism of a pyridinium-functionalized coordination complex

Abstract

Photomechanical motion triggered by [2 + 2] cycloaddition as well as simultaneous photochromic and fluorescence changes has been achieved by introducing flexible methylene groups and cation–π interactions into a pyridinium-based coordination complex.

[2 + 2] cycloaddition and its photomechanical effects on 1D coordination polymers with reversible amide bonds and coordination site regulation

“…In this work, we employed a mixed matrix membrane strategy to combine the photoresponsive crystals of 1 and 2 with polymer PVA to enhance the photomechanical properties. 48,49,55 The PXRD pattern of 1-PVA / 2-PVA matched the combined pattern of PVA and 1 / 2 , maintaining the crystallinity of 1 / 2 (Fig. S35†).…”

“…Because the rigid skeletons of 2D and 3D CPs exert significant limitations on the amplification of microscopic motion to crystal macroscopic motion, most photoreactive CPs reported in the literature are 1D. 19,48–50 In this work, two pyridinamide olefin ligands, namely. (2 E )- N -3-Pyridinyl-3-(2-thienyl)-2-propenamide ( 3-ptpa ) and (2 E )- N -4-Pyridinyl-3-(2-thienyl)-2-propenamide ( 4-ptpa ), were designed by combining reversible amide bonds with pyridine N coordination site regulation.…”

“…Because the rigid skeletons of 2D and 3D CPs exert signicant limitations on the amplication of microscopic motion to crystal macroscopic motion, most photoreactive CPs reported in the literature are 1D. 19,[48][49][50] In this work, two pyridinamide olen ligands, namely. were synthesized through a solvothermal reaction under the same conditions.…”

Photoactuators Based on Plastically Flexible α‐Cyanostilbene Molecular Crystals Driven by the Solid‐State [2+2] Cycloaddition Reaction

“…Currently, a series of organic photomechanical materials (e.g., single crystals, [ 7 − 11 ] liquid crystals, [ 12 ] gels, [ 13 ] and composites [ 14 − 18 ] ) have been developed. Compared to other photomechanical materials that contain less‐ordered or more‐diluted photochromes, single crystals usually exhibit superior actuation performance, such as fast energy conversion rates and reduced energy dissipation.…”

Inclusion Complexes of Cyclodextrins with 1-(4-Carboxybenzyl)-4-[2-(4-pyridyl)vinyl]pyridinium Chloride: Photochromism, Erasable Inkless Printing, and Color Tuning

“…The trans -1,2-bis­(4-pyridyl)­ethylene derivatives possesses two kinds of photoactive groups, ethylene and pyridinium groups. Zhang and co-workers discovered that the trans -1,2-bis­(4-pyridyl)­ethylene derivatives can undergo photoinduced [2 + 2] cycloaddition and viologen-like photochromic reaction. − Inspired by these results, we prepared a potential photochromic compound, 1-(4-carboxybenzyl)-4-[2-(4-pyridyl)­vinyl]­pyridinium chloride (guest CPP + ·Cl – , Figure ), and investigated its binding behavior with different size of CDs because CDs possess excellent water solubility and are cheap and easily available. Interestingly, the inclusion complexes of CDs with CPP + ·Cl – in solid state exhibit reversible photochromic properties.…”