NMR Studies of Phase Transitions

Odin, Christophe

doi:10.1016/s0066-4103(06)59003-9

Cited by 14 publications

(15 citation statements)

References 292 publications

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“…[25] In a general frame where the static magnetic field components are B α , the 12 C. Odin first-order frequency ν (1) can be shown to be proportional to…”

Section: Theory: Frequency Of Two Inequivalent Sites and Order Parametermentioning

confidence: 99%

“…This work is another example, among many, of the power of NMR in the study of structural phase transitions, which again emphasizes the complementarity with X-ray and neutron techniques. Moreover, NMR evidence of critical behavior in solid to solid state phase transitions are not so common [1] that we think it worthwile reporting new results that can be quantified from a good knowledge of the sample properties.…”

Section: Critical Behavior Of the 2 H Zeeman Relaxation Timementioning

confidence: 99%

“…[1] For example, the number of NMR lines reflects the change of symmetry, and their positions the onset of the new organization of the new phase induced by the symmetry breaking of the high-temperature (HT) phase. Moreover, on approaching the critical temperature T c from below or above, the amplitude of the fluctuations increases drastically, and the typical correlation times present a critical slowing down.…”

Section: Introductionmentioning

confidence: 99%

“…In general, this effect precludes the extraction of activation energies, which become doubtful if the noncritical and critical contributions cannot be separated. [1] Other singular behaviors are also possible. In addition to the fact that a singular behavior may evidence a phase transition, the nature of the singularity may also give some insight into the nature of the phase transition.…”

Section: Introductionmentioning

confidence: 99%

“…phenomena, though it is known that not taking into account the new behaviors that occur near a phase transition may give misleading results. [1] In contrast, our approach is strictly in the framework of critical phenomena. From 13 C and 39 K powder NMR on KHCO 3 , [18] we interpreted the evolution of the NMR parameters using a two-site-jump model coupled to an order/disorder phase transition order parameter.…”

Section: Introductionmentioning

confidence: 99%

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Critical behavior of KDCO₃ from ²H and ³⁹K single crystal NMR

Odin¹

2007

Magnetic Reson in Chemistry

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Potassium hydrogenocarbonate KDCO3 presents an order/disorder phase transition at Tc approximately 353 K. The critical behavior of this phase transition was studied by single crystal 2H and 39K NMR. The evolution of the order parameter as a function of temperature is quantified, and the critical exponent was determined, indicating a transition close to a tricritical point. The 2H Zeeman relaxation rate is strongly increased near the transition temperature. By calculating the noncritical contribution to the Zeeman relaxation rate, we show that the observed relaxation rate clearly presents a pseudo-divergent behavior near Tc, with a logarithmic singularity. The nature of the phase transition is discussed in the light of these results.

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“…[25] In a general frame where the static magnetic field components are B α , the 12 C. Odin first-order frequency ν (1) can be shown to be proportional to…”

Section: Theory: Frequency Of Two Inequivalent Sites and Order Parametermentioning

confidence: 99%

Section: Critical Behavior Of the 2 H Zeeman Relaxation Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Critical behavior of KDCO₃ from ²H and ³⁹K single crystal NMR

Odin¹

2007

Magnetic Reson in Chemistry

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Solid‐state Nuclear Magnetic Resonance of Polymorphic Materials

Vogt¹

2011

Encyclopedia of Analytical Chemistry

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Solid‐state nuclear magnetic resonance (SSNMR) spectroscopy is a powerful analytical technique for the analysis of polymorphs, which are molecules that exist in different crystalline phases. In this review, applications of SSNMR to polymorphism and related phenomena in a variety of chemical systems are discussed, including pharmaceuticals, food materials, explosives, dyes and pigments, biomolecules, inorganic materials, and organometallic compounds. The advantages of SSNMR are highlighted in relation to other analytical techniques, such as diffraction methods. The SSNMR techniques commonly used to analyze these systems and probe aspects of their polymorphic structure are reviewed, and illustrative examples from each class are given. In recent years, increasingly sophisticated SSNMR methods have been applied to the analysis of polymorphism, including 2‐D correlation methods, methods that measure chemical shift tensors, methods that extract quadrupolar parameters at high static field strengths, and computational methods that assist in interpreting and understanding the experimental data in relation to crystal structure. Multicomponent crystals including salts, solvates, and cocrystals also display polymorphism, and are often included with polymorphs in investigations of supramolecular chemistry and crystal engineering. The relationship between crystalline and amorphous materials is also discussed to emphasize the applicability of the analytical technique and the complementary information often obtained. Finally, the importance of SSNMR within multidisciplinary studies of polymorphism using other techniques is emphasized.

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Thermal effects in guest–host systems: [Zn₂(bdc)(S‐lac)(dmf)]•PhEtOH: A DSC and NMR study

2017

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Differential scanning calorimetry and nuclear magnetic resonance were used to investigate thermal effects in the guest-host systems where homochiral metal-organic sorbent [Zn (bdc)(S-lac)(dmf)] is considered as a host while 1-phenylethanol enantiomers and their racemic mixture serve as guest molecules. A maximum energy gain from the guest-host interaction was observed in the system with the racemic mixture. The effect of host-guest recognition was revealed for the case of the host and guest having a similar type of chirality in the presence of antipode guest molecules.

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NMR Studies of Phase Transitions

Cited by 14 publications

References 292 publications

Critical behavior of KDCO₃ from ²H and ³⁹K single crystal NMR

Critical behavior of KDCO₃ from ²H and ³⁹K single crystal NMR

Solid‐state Nuclear Magnetic Resonance of Polymorphic Materials

Thermal effects in guest–host systems: [Zn₂(bdc)(S‐lac)(dmf)]•PhEtOH: A DSC and NMR study

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NMR Studies of Phase Transitions

Cited by 14 publications

References 292 publications

Critical behavior of KDCO3 from 2H and 39K single crystal NMR

Critical behavior of KDCO3 from 2H and 39K single crystal NMR

Solid‐state Nuclear Magnetic Resonance of Polymorphic Materials

Thermal effects in guest–host systems: [Zn2(bdc)(S‐lac)(dmf)]•PhEtOH: A DSC and NMR study

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Product

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Critical behavior of KDCO₃ from ²H and ³⁹K single crystal NMR

Critical behavior of KDCO₃ from ²H and ³⁹K single crystal NMR

Thermal effects in guest–host systems: [Zn₂(bdc)(S‐lac)(dmf)]•PhEtOH: A DSC and NMR study