title: Stacking of double bonds for photochemical [2+2] cycloaddition reactions in the solid state.
abstract: trans-1,2-Bis(4-pyridyl)ethylene (bpe), containing a C=C bond, has been extensively studied for solid-state photochemical [2+2] cycloaddition reactions, in discrete molecular and metal complexes, hydrogen bonded and coordination polymeric structures. The challenges in orienting a pair or more of bpe molecules in the solid-state using crystal engineering principles, and their photochemical behaviour and implications, based on Schmidt's postulates, are discussed.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore.
authors.forename: Mangayarkarasi
authors.initials: M
authors.lastname: Nagarathinam
authors.forename: Abdul Malik Puthan
authors.initials: AM
authors.lastname: Peedikakkal
authors.forename: Jagadese J
authors.initials: JJ
authors.lastname: Vittal