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Moon, Hoi Ri
Functional Inorganic Nanomaterials for Energy Lab (FINE)
Research Interests
  • Inorganic-organic hybrid materials, carbon capture materials, hydrogen storage materials, heterogeneous catalyst

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Guest-driven structural flexibility of 2D coordination polymers: Synthesis, structural characterizations, and gas sorption properties

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Title
Guest-driven structural flexibility of 2D coordination polymers: Synthesis, structural characterizations, and gas sorption properties
Author
Hyun, Sung-minKim, Tae KyungKim, Yun KyeongMoon, DohyunMoon, Hoi Ri
Keywords
Coordination polymer; Gas sorption; Guest dependency; Self-assembly; Structural flexibility
Issue Date
201307
Publisher
ELSEVIER SCIENCE BV
Citation
INORGANIC CHEMISTRY COMMUNICATIONS, v.33, no., pp.52 - 56
Abstract
Two coordination polymers, {[(NiLallyl)2(BuTC)] â™2DEFâ™2H2O} (1) and {[(NiL allyl)2(BuTC)]â™3H2O} (2), ([NiLallyl](ClO4)2 = [Ni(C14H 30N6)](ClO4)2, H4BuTC = 1,2,3,4-butanetetracarboxylic acid, DEF = N,N′-diethylformamide), were prepared by the self-assembly of [NiLallyl](ClO4) 2 and H4BuTC in DEF/H2O and acetonitrile/H 2O, respectively. Single crystal X-ray diffraction and X-ray powder diffraction (XRPD) results revealed that 1 and 2 have two-dimensional layered structures, and the layers were stacked infinitely. Further, guest molecules were intercalated between the layers. Since both of coordination polymers 1 and 2 were constructed from the same building blocks, the structure of each layer was identical. However, depending on the size and the nature of guest molecules, layer packing and the interlayer distances were different for each coordination polymer. Interestingly, due to the instability of DEF guest molecules intercalated in the coordination polymer 1, these guest molecules could be easily liberated from the host, consequently resulting in the same XRPD pattern as that of 2 with slightly different relative intensities. Dried compounds of 1 and 2 (1′ and 2′, respectively) also showed the same result as evidenced by the XRPD patterns. The similar but non-identical XRPD patterns were revealed that the dried structure 1′ had the same interlayer distance and the same intralayer structure as 2 and 2′ did, whereas its layer packing remained the same as that of 1. This subtle structural difference of 1′ and 2′ resulted in their different CO2 uptake behaviors at 195 K.
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DOI
http://dx.doi.org/10.1016/j.inoche.2013.04.020
ISSN
1387-7003
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