Guest-Inclusion Behavior of Double-Strand 1D Coordination Polymers Based on N,N′-Type Schiff Base Ligands

Four double‐strand one‐dimensional (1D) coordinationpolymers, namely, {[Ni(N3Py)2(NO3)2]·(C6H6)x·C2H5OH}n (1), [Cd(ImBNN)2(CH3C6H4SO3)2]n (2), {[Co(N3OPy)2(H2O)2](ClO4)2·C6H6·H2O}n (3), and {[Co(N3OPy)2(H2O)2](ClO4)2·(C8H10)x}n (4) were obtained from the assembly of three N,N′‐type Schiff base ligands, 1,4‐bis(3‐pyridyl)‐2,3‐diaza‐1,3‐butadiene (N3Py), 2,5‐bis(4′‐(imidazol‐1‐yl)benzyl)‐3,4‐diaza‐2,4‐hexadiene (ImBNN), and bis[4‐(3‐pyridylmethylenemino)phenoxy]methane (N3OPy), with transition‐metal ions. All complexes were characterized by single‐crystal X‐ray diffraction, X‐ray powder diffraction, and FTIR measurements. The guest‐inclusion behavior of these complexes were investigated by thermogravimetric and X‐ray powder diffraction analyses. The structural relationship between the ligands and the cavity sizes and packing fashions have been discussed to elucidate the distinctive guest‐inclusion behavior of these complexes.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) Four 1D double‐strand coordination polymers were obtained from the assembly of three N,N′‐type Schiff base ligands of distinctive lengths and flexibility with transition‐metal ions. These coordination polymers contain the same M2L2 basic rings but display different crystal packingfashions, which results in different guest adsorption and desorption properties.