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000018307 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000018307 1001_ $$0P:(DE-HGF)0$$aBator, G.$$b0
000018307 245__ $$a4,4'-, 5,5'- and 6,6' -dimethyl-2,2'-bipyridyls: the structures, phase transitions, vibrations and methyl group tunneling of their complexes with chloranilic acid
000018307 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2011
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000018307 440_0 $$03145$$aJournal of Chemical Physics$$v135$$x0021-9606$$y4
000018307 500__ $$aThis work was supported by the Polish Ministry of Science and Higher Education (Project Register No. N N204 2497 34) and partially by the International Programme ZIBJ DUBNA 04-4-1069-2009/2010.04.29 (Decision No. 868/W-ZIBJ DUBNA/2010/0). This research project has been supported by the European Commission under the 7th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures (Contract No. 226507 (NMI3)).
000018307 520__ $$aThe crystal and molecular structures of 4,4(')- and 6,6(')-dimethyl-2,2(')-bipyridyl complexes with 2,5-dichloro-3,6-dihydroxy-p-benzoquinone (chloranilic acid, CLA) have been determined and compared with those of the complex with the 5,5(')-derivative, which is known to possess interesting antiferroelectric properties. In the crystalline state, all three compounds form hydrogen bonded chains with N(+)-H···O(-) and O-H···N bridges on both sides of the bipyridyl constituent. The comparison of three derivatives indicates that the N(+)-H···O(-) hydrogen bonds are shortest for the 5,5(')-dimethyl complex. The 4,4(')- and 6,6(')-derivatives do not show any ferroelectric feature. The 6,6(')-one is, however, characterized by a continuous phase transition, revealed in the differential scanning calorimetry, dilatometric, and dielectric characteristics. The tunneling splitting measured by neutron backscattering in the energy range ±30 μeV for the neat dimethyl bipyridyls and their complexes with CLA indicates that the different splittings are primarily due to the crystal packing effect and that charge transfer between interacting compounds plays only a minor role.
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000018307 65320 $$2Author$$abackscatter
000018307 65320 $$2Author$$acharge exchange
000018307 65320 $$2Author$$acrystal structure
000018307 65320 $$2Author$$adifferential scanning calorimetry
000018307 65320 $$2Author$$ahydrogen bonds
000018307 65320 $$2Author$$amolecular configurations
000018307 65320 $$2Author$$aneutron diffraction
000018307 65320 $$2Author$$aorganic compounds
000018307 65320 $$2Author$$apermittivity
000018307 65320 $$2Author$$asolid-state phase transformations
000018307 65320 $$2Author$$atunnelling
000018307 65320 $$2Author$$avibrational states
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000018307 7001_ $$0P:(DE-HGF)0$$aSawka-Dobrowolska, W.$$b1
000018307 7001_ $$0P:(DE-HGF)0$$aSobczyk, L.$$b2
000018307 7001_ $$0P:(DE-HGF)0$$aGrech, E.$$b3
000018307 7001_ $$0P:(DE-HGF)0$$aNowicka-Scheibe, J.$$b4
000018307 7001_ $$0P:(DE-HGF)0$$aPawlukojc, A.$$b5
000018307 7001_ $$0P:(DE-Juel1)131044$$aWuttke, J.$$b6$$uFZJ
000018307 7001_ $$0P:(DE-HGF)0$$aBaran, J.$$b7
000018307 7001_ $$0P:(DE-HGF)0$$aOwczarek, M.$$b8
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