Conformation-controlled assembly of coordination polymers with 1,2-bis(3-pyridylcarboxamide)benzene: Structures and properties |
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| Authors: | Ben-Lai Wu Zhong-Jun Li Hong-Wei Hou |
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| Affiliation: | Department of Chemistry, Zhengzhou University, Zhengzhou 450052, PR China |
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| Abstract: | Self-assembly of 1,2-bis(3-pyridylcarboxylamide)benzene (H2bpb) with sulfate salts gave rise to three new coordination polymers, [Ni2(H2bpb)2(H2O)2(CH3OH)2(SO4)2]n · nCH3OH 1, [Co2(H2bpb)2(CH3OH)2(DMF)2(SO4)2]n · 0.5nH2O 2 (DMF = N,N′-dimethylformamide) and [Zn2(H2bpb)2(CH3OH)2(DMF)2(SO4)2]n · 0.5nH2O 3. They all crystallize in a monoclinic space group C2/c, with two crystallographically distinct metal nodes being surrounded by slightly distorted octahedra. There is a homologous chair-like unit with bridging ligand H2bpb as the back and bis(monodentate) sulfate anion as the seat in their crystal structures. Through the recognition of strong π?π stacking interactions between benzene rings, those chains formed by the unlimited extension of the chair-like units stack up to produce 1-D channels along c axis where lattice molecules and terminal ligands are accommodated. Interestingly, the trans,trans,syn achiral conformation with Cs symmetry of H2bpb which is further enforced by sulfate-bridged coordination and intramolecular hydrogen bonding in the chair-like units, controls over the assembling architectures. Further investigation on the thermal and fluorescent properties of complexes 1-3 shows that the homologous chair-like units in all complexes are stable enough until to 320 °C and that the fluorescence nature of H2bpb is not sensitive to its conformations. |
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| Keywords: | Conformation-controlled assembly Crystal structure Coordination polymer Fluorescent property Thermal property |
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