No strong hydrogen bonding but weaker chalcogen bonding (ChB) interactions are used for the first time to organize diacetylene molecules in the solid state for thermal topochemical polymerization. The obtained polydiacetylene, free of the pyridine-based ChB acceptor, exhibits an 8 orders of magnitude increase in conductivity upon iodine doping.
Photoreactivity of polymorphs of a ladder polymer with criss-cross and parallel orientations of CC bonds
作者:Anjana Chanthapally、Wei Ting Oh、Jagadese J. Vittal
DOI:10.1039/c3cc47816e
日期:——
Two polymorphic forms of a ladder coordination polymer [Zn2(mu-O2C-p-Tol)2(O2C-p-Tol)2(bpe)2] have parallel and criss-cross alignments of the C=C bond pairs. Both polymorphs undergo 100% [2+2] cycloaddition reaction but the one with a parallel orientation of C=Cbonds (thermodynamic product) retains its single crystallinity after the reaction.
Self-assembly, concomitant photochemical processes, and improvement of the yield of [2 + 2] photoreactions from supramolecular arrays via mechanochemical assistance
作者:Alexander Briceño、Dayana Leal、Gabriela Ortega、Graciela Díaz de Delgado、Edgar Ocando、Liz Cubillan
DOI:10.1039/c3ce26752k
日期:——
Novel examples of self-assembly, structural transformations and concomitant photochemical processes from supramolecular ternary assemblies directed by charge-assisted hydrogen bonds are shown. In addition, mechanochemical assistance is also shown as a potential tool in order to improve the yield of [2 + 2] photoreactions in the solid state.
Guest Effect: The differences of nitrogen atom positions and the bridge bonds linked to two pyridine rings of some bipyridine guests can significantly affect the binding abilities and inclusiongeometries of β‐cyclodextrin with the guests in both the solution and solid states.