title: Entanglement of individual coordination polymers having helicates as building intermediates.
abstract: A series of Ag(I) coordination compounds, from one-dimensional chains to 3D porous frameworks, were achieved from N,N'-bis[1-(2-pyrazinyl)ethylidene]benzil dihydrazone, L, via self-assembly, using helicates as effective secondary building units. Compound 2 [(Ag(2.75)L)(NO(3))(2.75)] was comprised of two opposite-handed 3D frameworks formed by connecting the 4(1) helical chains into (10(3)-b) nets. The pairs of the racemic 3D frameworks were connected through additional silver(I) centers and entangled each other forming a racemic 3D net. Compound 3 [(Ag(13)L(8))(BF(4))(13)(H(2)O)(12)] was comprised of a 3D framework that was constructed from double-helical building intermediates Ag(2)L(2) with one-dimensional infinite chains being threaded into the large voids of a 3D framework to form a weave structure. The ladder-like chains in compound 4 [(Ag(3)L(2))(ClO(3))(3)(CH(3)OH)(2)(CH(3)CN)] were formed by the addition of excess NaClO(3) into the methanol solution containing AgNO(3) and the ligand L, and the zigzag chains in compound 5 [(Ag(2)L(2))(ClO(4))(2)(CH(3)CN)(2)] were constructed by the addition of excess NaClO(4) into an acetonitrile solution containing AgNO(3) and the ligand L.
authors.affiliation: State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, PR China.
authors.forename: Qiaozhen
authors.initials: Q
authors.lastname: Sun
authors.forename: Meilin
authors.initials: M
authors.lastname: Wei
authors.forename: Yan
authors.initials: Y
authors.lastname: Bai
authors.forename: Cheng
authors.initials: C
authors.lastname: He
authors.forename: Qingjin
authors.initials: Q
authors.lastname: Meng
authors.forename: Chunying
authors.initials: C
authors.lastname: Duan
mesh_terms: D002412:Cations; D018360:Crystallography, X-Ray / Q000379:methods; D006835:Hydrazones / Q000737:chemistry; D008024:Ligands; D008956:Models, Chemical; D008968:Molecular Conformation; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D011487:Protein Conformation; D011719:Pyrazines / Q000737:chemistry