| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 93 === Abstract
A series of discrete supramolecules and one coordination polymer were synthesized via the self-assembly strategy from 4,4’-bis(2-pyridylmeathyleneamine)-3,3’-dimethylbiphenyl (BPDBP) or 1,1’-carbonyldiimidazole with rhenium metal salts. The solid state structures of the products were characterized by single-crystal X-ray diffraction analyses.
Treatment of BPDBP with Ag+ and Cd2+ ions leads to the formation of a series of rectangular compounds [Ag2(BPDBP)2(NO3)](NO3) ∙ H2O (1), [Ag2(BPDBP)2](SbF6)2 ∙ 2(C6H5NO2) (2), [Ag2(BPDBP)2](ClO4)1.5(OH)0.5 ∙ 1.25H2O ∙ 0.25CH3OH (3), [Cd2(BPDBP)2(ClO4)2] (4), and an one dimensional species [Cd2(BPDBP)(NO3)2]n (5). Solid-state structure analysis reveals that compounds 1–4 adopt rectangular geometry with a M2L2 fashion. The two silver centers in 1 are crystallographically independent. The coordination environments around the two silver centers are five-coordinated square pyramidal and four-coordinated square planar geometries, respectively. Whereas both the two silver centers in 2 and 3 are four-coordinated square planar. In 4, the cadmium(II) centers are coordinated by four nitrogen atoms from two BPDBP ligands and two perchlorate ions to furnish an octahedron geometry. All these compounds show intramolecular π�{π interactions between the two BPDBP ligands in stabilizing the rectangular structures. Compound 5 presents a one-dimensional zigzag chain architecture. The coordination number around Cd(II) ion is eight, which composes of four nitrogen atoms from two Schiff-bases and four oxygen atoms from two nitrate anions.
Reaction of Re2(CO)10 with 1,1’-carbonyldiimidazole in the presence of toluene under hydrothermal conditions gives compound [Re3(μ-C3H3N2)3(CO)12] (6). Each rhenium(I) center in 6 is six-coordinated octahedron consisting of four carbonyl groups and two nitrogen atoms. The Re–CO bonds trans to imidazolyl ligand are significant shorter than that of the other two groups. The packing diagram of 6 shows that the discrete triangular molecules are arranged in a one-dimensional ladder-like chain through weak intermolecular C–H∙∙∙O interactions.
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