title: Sunlight-induced covalent marriage of two triply interlocked Pd6 cages and their facile thermal separation.
abstract: A template-free triply interlocked Pd6 cage (2) was synthesized by two-component self-assembly of cis-blocked 90° acceptor cis-(tmen)Pd(NO3)2 (M) and 1,3,5-tris((E)-2-(pyridin-3-yl)vinyl)benzene (L). Assembly 2 was characterized by (1)H NMR and ESI-MS, and the structure was confirmed by X-ray crystallography, which revealed a parallel conformation of the olefin double bonds belonging to the adjacent cages in the solid state at a distance of 3.656 Å, thereby indicating the feasibility of [2+2] photochemical reaction. Two adjacent interlocked cages were covalently married together by intermolecular [2+2] cycloaddition in a single crystal-to-single crystal fashion upon exposure to sunlight/UV irradiation. Most surprisingly, the covalently married pair was easily separated thermally in aqueous medium under mild reaction conditions.
authors.affiliation: Department of Inorganic and Physical Chemistry, Indian Institute of Science , Bangalore-560012, India.
authors.forename: Dipak
authors.initials: D
authors.lastname: Samanta
authors.forename: Partha Sarathi
authors.initials: PS
authors.lastname: Mukherjee
mesh_terms: D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*; D013472:Sunlight; D013696:Temperature
chemical_list: D009942:Organometallic Compounds; D010165:Palladium