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• W2317536418 startingPage "268" @default.
• W2317536418 abstract "A new porphyrin-based Co-MOF, [Co(DpyDtolP)]6·12H2O (I), composed of DpyDtolP (5,15-di(4-pyridyl)-10,20-di(4-methylphenyl)porphyrin) was prepared in a high yield and structurally characterized by X-ray crystallography. DpyDtolP is a ditopic N-donor ligand with a large space or gap between the two pyridyl groups at the 5- and 15-positions of the porphyrin backbone. Unlike the pyridyl groups, the 4-tolyl groups in DpyDtolP could not be involved in coordination toward the metal ion. Nevertheless, the presence of these two 4-tolyl groups led to a new infinite three-dimensional framework: Co-MOF (I) with exceptionally high thermal stability at elevated temperature. The single crystals of I maintained their crystallinity even after vacuum drying at 250 °C. The resulting dried single crystals diffracted X-ray to give the same structural solution as the as-prepared crystals. The robust framework of I contained micropores that were periodically arranged in a hexagonal symmetry. While the evacuated I moderately sorbed N2 at 77 K, it sorbed 142.8 cm3 g–1 (6.37 mmol g–1) of CO2 at 196 K. The CO2 sorption isotherms exhibited a very clear step in both the adsorption and desorption branches. A slight hysteretic behavior was observed between the two branches. Furthermore, the crystal structure of CO2-captured I (I_CO2) revealed that the linear arrangement of the CO2 molecules occupied the inside of micropores, thereby indicating the effective CO2 capture by evacuated I. The evacuated I was also found to be ideal for the encapsulation of iodine molecules in cyclohexane to provide iodine-captured I (I_I2), which was also characterized by X-ray crystallography. The linear arrangement of polyiodine chains in the micropores was observed, and a single crystal of I_I2 exhibited electrically conducting behavior. The encapsulation amount of iodine was dependent on the crystal sizes of I. Additionally, the separately prepared microscale sample, micro-I, with a much reduced particle dimension than the bulk I exhibited an enhanced uptake of iodine under the same conditions." @default.
• W2317536418 created "2016-06-24" @default.
• W2317536418 creator A5021787719 @default.
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• W2317536418 creator A5054819415 @default.
• W2317536418 creator A5067118584 @default.
• W2317536418 creator A5088131160 @default.
• W2317536418 date "2014-12-01" @default.
• W2317536418 modified "2023-10-14" @default.
• W2317536418 title "Thermally Robust 3-D Co-DpyDtolP-MOF with Hexagonally Oriented Micropores: Formation of Polyiodine Chains in a MOF Single Crystal" @default.
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