1,721,065 research outputs found
Pressure-driven neutral-ionic transition in tetrathiafulvalene-2,5-dichloro-p-benzoquinone: Example of a continuous ionicity change
No full textThe effect of pressure on CD spectra of chiral octahedral transition metal-ligand complexes: L-, D- and (LD)(Cr[(+)(S,S)mebdtp]3)
No full textThe effect of pressure on circular dichroism spectra of a chiral helicoidal chromium complex
No full textThe effect of pressure on circular dichroism (CD) spectra of the octahedral chiral Λ- and Δ-tris-[cyclic O,O′,1(R), 2(R)-dimethylethylene dithiophosphato]chromium(III) complexes, Λ- and Δ-Cr[(R,R)bdtp]3, in the solid state has been studied. The pressure range investigated was 0-4 GPa. A method for measuring CD spectra under pressure is described. Results on polycrystalline samples in nujol indicate that the configuration at the metal centre of the chiral chromium complex inverts from the Δ- to the Λ-form, which eventually is the most stable at high pressure
A new type of neutral-ionic interface in mixed stack organic charge transfer crystals: Temperature induced ionicity change in ClMePD-DMeDCNQI
No full textIntermediate regime in pressure-induced neutral-ionic transition in tetrathiafulvalene-chloranil
No full textWe report a detailed spectroscopic study of the pressure-induced neutral-ionic phase transition of the mixedstack
charge-transfer crystal tetrathiafulvalene-chloranil. We show that the pressure induced phase transition is
still first-order and involves the presence of an intermediate disordered phase, defined by the coexistence of
two species of different ionicity. Further application of pressure gradually converts this phase into an homogeneous
ferroelectric phase with a single ionicity. In addition, we detect strong pretransitional phenomena
which anticipate the intermediate phase and are indicative of a precursor dynamic regime dominated by
fluctuations
Neutral-ionic interface in mixed stack charge transfer compounds: Pressure induced ionic phase of tetrathiafulvalene-chloranil (TTF-CA)
No full textPressure dependence of site-CDW amplitude in MX chains and the role of electron-phonon coupling
No full textConfigurational equilibrium and CD spectra under pressure of chiral octahedral complexes: Λ- and Δ-Cr[(-)(R,R)bdtp]3
No full textWe have studied the effect of pressure on the configurational inversion reaction at the metal centre of the chiral tris-(cyclic O,O'1(R),2(R)-dimethylethylene dithiophosphato) chromium(III) complexes, Λ(-)589Cr[(R,R)bdtp]3 and Δ(+)589Cr[(R,R)bdtp]3, in solutions of different solvents. We have observed positive or negative Cotton effects, assigned to the 4A2→4T2 transition of the metal ion in the visible region, and their evolution on increasing pressure. At equilibrium and at room conditions one observes a prevalence of the Δ-(R,R)(R,R)(R,R) diastereoisomer in CHCl3 or CH2Cl2 and of the Λ- one in THF. On increasing the pressure a change in the inversion equilibrium occurs, producing an increase in the concentration of the Λ-(R,R)(R,R)(R,R) form in all solvents
Raman studies of the pressure driven neutral to ionic transitions in tetrathiafulvalene-haloquinone mixed stack charge transfer crystals
No full textHigh pressure optical studies of neutral-ionic phase transitions in organic charge-transfer crystals
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