Abstract
Flexible and asymmetric ligand L [L = 1-((pyridin-3-yl)methyl)-1H-benzotriazole], is used as a basic backbone to construct complicated metal-organic frameworks. Two new polymers, namely, [Ag2(L)2(NO3)2]n (1) and [Ag(L)(ClO4)]n (2), were synthesized and characterized by X-ray structure analysis and fluorescent spectroscopy. The complex 1 gives an “S” type double helical conformation, whereas complex 2 exhibits a 1D zigzag configuration. Different anions affect the silver coordination geometry and crystal packing topology.
Highlights
In the research of supramolecular chemistry, great interest has recently focused on crystal engineering of coordination frameworks due to their intriguing architectures, new topologies, intertwining phenomena and potential applications in microelectronics, nonlinear optics, ion exchange, molecular selection, molecular separation and recognition [1,2,3,4,5,6,7,8]
The structural motifs of coordination polymers rest on several factors, such as the central atom, the performance of the ligands, the coordinated and/or non-coordinated counter ions, the solvent systems and the reaction conditions
The final refinements were performed by full-matrix least-squares methods on F2 by SHELXL-97 program package [29]
Summary
In the research of supramolecular chemistry, great interest has recently focused on crystal engineering of coordination frameworks due to their intriguing architectures, new topologies, intertwining phenomena and potential applications in microelectronics, nonlinear optics, ion exchange, molecular selection, molecular separation and recognition [1,2,3,4,5,6,7,8]. The structural motifs of coordination polymers rest on several factors, such as the central atom, the performance of the ligands, the coordinated and/or non-coordinated counter ions, the solvent systems and the reaction conditions. From a structural point of view, it should be pointed out that (a) as a kind of angular ditopic ligand, the two exo-N atoms of its two different rings can μ2-bridge to two different metal atoms; (b) though the CH2 spacer‘s torsion angle can be twisted only within a limited range due to the sp configuration of C atom, its pyridine and benzotriazole rings bear a variable dihedral angle to meet the requirement of coordination geometries of metal ions as well as minimize steric interactions in the assembly process; (c) due to its unsymmetrical nature, L satisfies the fundamental requirements for the construction of acentric solids and NLO (non-linear optical) materials. Two new polymers, namely [Ag2(L)2(NO3)2]n (1) and [Ag (L)(ClO4)]n (2), were obtained as crystals suitable for single-crystal X-ray analysis
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