Abstract
Two metal-organic frameworks {Na2[Ni(L)2(H2O)]}n (1) and {[Ni(L)(H2O)]·2H2O}n (2) (H2L = N-pyrazinesulfonyl-glycine) have been prepared by reaction of the same proportion Ni(CH3COO)2·4H2O and H2L but with different pH values in water-ethanol mixed solution, and were characterized by X-ray diffraction, elemental analysis, IR spectrum. X-ray analysis indicates that 1 is a 3-D polymeric structure containing two different secondary building units (SBUs, NiN4O2 and Na2O8), in which two deprotonated L ligands coordinate in a facial tridentate arrangement about the NiII atom. While complex 2 is a 1-D chain structure, in which three N atoms of two L ligands coordinate to one NiII atom but its pyrazyl N atom monodentate-bridge to adjacent NiII atom. Thus SBUs Ni(L)(H2O)2 are obtained between two neighboring NiII atoms and they connect one another to form this new polymer. In the crystal, two different hydrogen bond motifs and π···π stacking are found in 1 and 2.
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Acknowledgments
This work was supported by the Guangxi Provincial Department of Education (Nos. KY2015ZD130, YB2014414) and the Natural Science Foundation of Guangxi Province (Nos. 2014GXNSFAA118035, 2014GXNSFBA118040). The supports of the National Natural Science Foundation of China (No. 51402158) is gratefully acknowledged. The authors also acknowledge the financial supported by the Opening Project of Guangxi Colleges and Universities Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization (No. 2015KLOG09).
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Li, JM., He, KH., Shi, ZF. et al. Syntheses and crystal structures of two new nickel (II) metal-organic frameworks with a polydentate ligand. J Porous Mater 23, 1679–1685 (2016). https://doi.org/10.1007/s10934-016-0229-5
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DOI: https://doi.org/10.1007/s10934-016-0229-5