3 research outputs found
Selective Separation of Water, Methanol, and Ethanol by a Porous Coordination Polymer Built with a Flexible Tetrahedral Ligand
A novel porous coordination polymer, Cu<sup>II</sup>(mtpm)ÂCl<sub>2</sub> [mtpm = tetrakisÂ(<i>m</i>-pyridyloxy methylene)Âmethane],
has been synthesized, and its crystal structure has been determined.
Its adsorption isotherms for water, methanol, and ethanol are totally
different from each other. It adsorbs water at low humidity and shows
gate-open behavior for methanol, but it does not adsorb ethanol. This
compound has the capacity to separate both methanol and water from
bioethanol, which is a mixture of water, methanol, and ethanol
Promotion of Low-Humidity Proton Conduction by Controlling Hydrophilicity in Layered Metal–Organic Frameworks
We controlled the hydrophilicity of metal–organic
frameworks
(MOFs) to achieve high proton conductivity and high adsorption of
water under low humidity conditions, by employing novel class of MOFs,
{NR<sub>3</sub>(CH<sub>2</sub>COOH)}Â[MCrÂ(ox)<sub>3</sub>]·<i>n</i>H<sub>2</sub>O (abbreviated as <b>R-MCr</b>, where
R = Me (methyl), Et (ethyl), or Bu (<i>n</i>-butyl), and
M = Mn or Fe): <b>Me-FeCr</b>, <b>Et-MnCr</b>, <b>Bu-MnCr</b>, and <b>Bu-FeCr</b>. The cationic components have a carboxyl
group that functions as the proton carrier. The hydrophilicity of
the cationic ions was tuned by the NR<sub>3</sub> residue to decrease
with increasing bulkiness of the residue: {NMe<sub>3</sub>(CH<sub>2</sub>COOH)}<sup>+</sup> > {NEt<sub>3</sub>(CH<sub>2</sub>COOH)}<sup>+</sup> > {NBu<sub>3</sub>(CH<sub>2</sub>COOH)}<sup>+</sup>. The
proton conduction of the MOFs increased with increasing hydrophilicity
of the cationic ions. The most hydrophilic sample, <b>Me-FeCr</b>, adsorbed a large number of water molecules and showed a high proton
conductivity of ∼10<sup>–4</sup> S cm<sup>–1</sup>, even at a low humidity of 65% relative humidity (RH), at ambient
temperature. Notably, this is the highest conductivity among the previously
reported proton-conducting MOFs that operate under low RH conditions
Promotion of Low-Humidity Proton Conduction by Controlling Hydrophilicity in Layered Metal–Organic Frameworks
We controlled the hydrophilicity of metal–organic
frameworks
(MOFs) to achieve high proton conductivity and high adsorption of
water under low humidity conditions, by employing novel class of MOFs,
{NR<sub>3</sub>(CH<sub>2</sub>COOH)}Â[MCrÂ(ox)<sub>3</sub>]·<i>n</i>H<sub>2</sub>O (abbreviated as <b>R-MCr</b>, where
R = Me (methyl), Et (ethyl), or Bu (<i>n</i>-butyl), and
M = Mn or Fe): <b>Me-FeCr</b>, <b>Et-MnCr</b>, <b>Bu-MnCr</b>, and <b>Bu-FeCr</b>. The cationic components have a carboxyl
group that functions as the proton carrier. The hydrophilicity of
the cationic ions was tuned by the NR<sub>3</sub> residue to decrease
with increasing bulkiness of the residue: {NMe<sub>3</sub>(CH<sub>2</sub>COOH)}<sup>+</sup> > {NEt<sub>3</sub>(CH<sub>2</sub>COOH)}<sup>+</sup> > {NBu<sub>3</sub>(CH<sub>2</sub>COOH)}<sup>+</sup>. The
proton conduction of the MOFs increased with increasing hydrophilicity
of the cationic ions. The most hydrophilic sample, <b>Me-FeCr</b>, adsorbed a large number of water molecules and showed a high proton
conductivity of ∼10<sup>–4</sup> S cm<sup>–1</sup>, even at a low humidity of 65% relative humidity (RH), at ambient
temperature. Notably, this is the highest conductivity among the previously
reported proton-conducting MOFs that operate under low RH conditions