title: Molecular tectonics: self-complementary supramolecular Se...N synthons directing assembly of 1D silver chains into 3D porous molecular architectures.
abstract: Reaction of 2,1,3-benzoselenadiazole (bsd) with AgNO3 results in the formation of a novel model example of a Se...N synthon directed molecular network of different polymorphs at different temperatures. Alpha-[Ag(bsd)2(NO3)] x 0.5bsd formed at ambient temperature, has a 3D porous molecular network constructed with monomeric [Ag(bsd)2(NO3)] motif, and has 1D channels that are encapsulated with 1D arrays of two-fold-disordered dimeric (bsd)2 guests aggregated by the self-complementary nonbonded Se...N interactions. This is the first molecular net directed by supramolecular Se...N synthons. The second polymorph, beta-[Ag(bsd)2(NO3)] x 0.5bsd, formed from an analogous reaction at 50 degrees C, contains a similar 3D molecular network constructed with tetrameric [Ag4(bsd)8(NO3)4] motif and 1D arrays of well-ordered dimeric (bsd)2 guests are encapsulated in the channels. Such ordered (bsd)2 dimers provide an excellent simplified dimeric model for MO calculations of intermolecular nonbonded Se...N interactions.
authors.affiliation: School of Chemistry and Chemical Engineering & Institute of Optoelectronic and Functional Composite Materials, Sun Yat-Sen University, Guangzhou 510275, PR China.
authors.forename: Ai-Ju
authors.initials: AJ
authors.lastname: Zhou
authors.forename: Shao-Liang
authors.initials: SL
authors.lastname: Zheng
authors.forename: Yue
authors.initials: Y
authors.lastname: Fang
authors.forename: Ming-Liang
authors.initials: ML
authors.lastname: Tong