首页|Inclusion of CO2, NH3, SO2, Cl-2 and H2S in porous N4O4-donor macrocyclic Schiff base
Inclusion of CO2, NH3, SO2, Cl-2 and H2S in porous N4O4-donor macrocyclic Schiff base
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NSTL
Elsevier
The removal and detection of highly toxic and environmentally harmful gases such as SO2, H2S and CO2 is a hot topic of the scientific community. Porous organic compounds, in particular, imine-based macrocycles, are promising materials for this purpose. In this paper we have used porous N4O4-donor macrocyclic Schiff base (1,6,20,25-tetraaza-2,5:8,9:17,18:21,24:27,28:36,37-hexabenzo-10,16,29,35-tetraoxa-cyclooctatriakonta-1,6,20,25-tetraen) (1) for sorption of NH3, SO2, Cl-2, CO2 and H2S. Five novel inclusion compounds 1xNH(3), 1xSO(2), 1xCl(2), 1xCO(2) and 1xH(2)S were prepared by a single-crystal to single-crystal (SC-SC) transformation. Single-crystal X-ray diffraction (SCXRD) analysis of 1xCO(2) and 1xNH(3) inclusion compounds have shown that CO2 molecule resides in the plane of the macrocyclic ring connected by weak C-O center dot center dot center dot pi interactions to the host, and no host-guest interactions in 1xNH(3) were observed. The relative thermal stabilities of the host-guest systems (T-on - T-b parameter) is in the range from 93 (1xNH(3)) to 132 degrees C (1xH(2)S), indicating the formation of stable inclusion compounds. Although used gases are highly reactive and corrosive, FT-IR and powder diffraction studies indicate that the molecular and crystal structure of the host is constant upon gas sorption. The activated compound displays moderate uptake (0.35 mmol/g) of CO2 at 298 K. The relatively high thermal stability, constant molecular and crystal structure of inclusion compounds with interesting optical properties (determined by solid state UV-Vis) make this material potentially useful for the detection of toxic gases.
Imine macrocyclePorous organic materialsHost-guest interactionsNH3H2SSO2CO2 and Cl-2 sorptionSHAPE-PERSISTENT MACROCYCLESMETAL-ORGANIC FRAMEWORKSTRUCTURAL-CHARACTERIZATIONADSORPTIONKINETICSAMMONIAGASADSORPTION/DESORPTIONSEPARATIONCAPTURE
Korica, Milenko、Balic, Ivana、van Wyk, Lisa M.、van Heerden, Dewald P.、Nikolayenko, Varvara, I、Barbour, Leonard J.、Jednacak, Tomislav、Dilovic, Ivica、Balic, Tomislav
NSTL
Elsevier
