Author: Akio Mishima

Enhancement of guest-responsivity by mesocrystallization of porous coordination polymers

2017

Mesocrystals of a porous coordination polymer {Fe(pz)[Pt(CN)4]} (1) showing spin transition were prepared by the reverse micelle method, and the size-controlled mesocrystal 1 kept its porous property and magnetic bistability and exhibited higher guest-responsivity with switching the spin state in both solid and aqueous suspension states than the bulk 1.

Materials scienceSpin states010405 organic chemistryCoordination polymerInorganic chemistryPorous Coordination PolymersSpin transitionGeneral Chemistry010402 general chemistry01 natural sciencesMicelle0104 chemical scienceschemistry.chemical_compoundResponsivitychemistryChemical engineeringMaterials ChemistryMesocrystalPorosityJournal of Materials Chemistry C

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Coordination nano-space as stage of hydrogen ortho–para conversion

2015

The ability to design and control properties of nano-sized space in porous coordination polymers (PCPs) would provide us with an ideal stage for fascinating physical and chemical phenomena. We found an interconversion of nuclear-spin isomers for hydrogen molecule H 2 adsorbed in a Hofmann-type PCP, {Fe(pz)[Pd(CN) 4 ]} (pz=pyrazine), by the temperature dependence of Raman spectra. The ortho (o)–para (p) conversion process of H 2 is forbidden for an isolated molecule. The charge density study using synchrotron radiation X-ray diffraction reveals the electric field generated in coordination nano-space. The present results corroborate similar findings observed on different systems and confirm …

196Materials scienceHydrogenPyrazine1002chemistry.chemical_elementCatalysissymbols.namesakechemistry.chemical_compoundhydrogen storage porous coordination polymerElectric fieldNano-Moleculelcsh:ScienceMultidisciplinaryCharge density39hydrogen storage porous coordination polymer; structure of absorbed H-2; ortho-para conversion56ChemistrychemistrysymbolsPhysical chemistrylcsh:Qstructure of absorbed H2ortho–para conversionRaman spectroscopyResearch ArticleRoyal Society Open Science

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Guest Modulation of Spin-Crossover Transition Temperature in a Porous Iron(II) Metal Organic Framework: Experimental and Periodic DFT Studies

2014

The synthesis, structure, and magnetic properties of three clathrate derivatives of the spin-crossover porous coordination polymer {Fe(pyrazine)[Pt(CN)(4)]} (1) with five-membered aromatic molecules furan, pyrrole, and thiophene is reported. The three derivatives have a cooperative spin-crossover transition with hysteresis loops 14-29 K wide and average critical temperatures T-c=201 K (1.fur), 167 K (1.pyr), and 114.6 K (1.thio) well below that of the parent compound 1 (T-c=295 K), confirming stabilization of the HS state. The transition is complete and takes place in two steps for 1.fur, while 1.pyr and 1.thio show 50% spin transition. For 1.fur the transformation between the HS and IS (mi…

Phase transitionPyrazineMetal–organic frameworksTransition temperatureOrganic ChemistrySpin transitionSpace groupGeneral ChemistryCatalysisSpin-crossover compoundsCrystallographychemistry.chemical_compoundTetragonal crystal systemDensity functional calculationsHofmann clathrateschemistryComputational chemistrySpin crossoverFISICA APLICADAMagnetic propertiesOrthorhombic crystal system

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