Photo-responsive metal–organic gels of rigid phenylene-1,3-di-substituted angular dienes with metal halides: gel-to-gel transformations triggered by [2 + 2] polymerization

Abstract

Herein, first reports on gel-to-gel transformation via [2+2] photo polymerization in MOGs of metal halides and rigid diene is demonstrated. The MOGs and their xerogels show exceptional ability to undergo...

Exploration of Solid-State [2 + 2] Photodimerization in the Coordination Polymers of Rigid and Linear Diene: Single-Crystal-to-Single-Crystal Transformation of a 2D Coordination Polymer to a 3D Coordination Polymer

“…The seminal works of Schmidt and co-workers in the 1960s paved the path for the topochemical principle governing solid-state [2 + 2] reactions, which states that the distance between the centroid of two parallelly aligned photoreactive olefins must be within 3.5–4.2 Å. , Such reactions often proceed through a single-crystal-to-single-crystal fashion, producing higher yields and compounds otherwise elusive by solution-based syntheses. − Moreover, performing [2 + 2] photocycloaddition reactions in the solid state offers advantages over solution-phase reactions by effectively mitigating potential trans–cis isomerization and other condensation reactions. We have explored several amides containing bis-olefins for dimerizations and polymerizations via [2 + 2] reactions in their organic crystals, CPs, and metal–organic gels. − Hydrogen bonds between amide moieties were shown to be responsible for templating SCSC [2 + 2] reactions to yield organic polymers, which were shown to be of utility in the formation of easily decomposable plastic films with good tensile strengths and high transparency. , …”