Structure and dynamics of a series of crystals of butterfly-like molecules as studied by 35Cl NQR, and 1H and 19F NMR

Eguchi, Taro; Nakamura, N.

doi:10.1016/0022-2860(94)08454-p

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…Saito, 1992, private communication to Nakayama et al, 1995). We quote from Nakayama: 'The lower phase transition is of second order with the entropy of transition 0.334 J mol À1 K À1 .…”

Section: Table 10mentioning

confidence: 99%

On the mechanism of some first-order enantiotropic solid-state phase transitions: from Simon through Ubbelohde to Mnyukh

Herbstein

2006

Acta Crystallogr B Struct Sci

118

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The first (so-called) lambda transition in solids was found in the specific heat measurements for NH(4)Cl at 242 K by F. Simon in 1922 [Simon (1922). Ann. Phys. 68, 241-280]. Analogous phenomena found in many other solids gave rise to doubts (expressed most clearly by A. R. Ubbelohde some 50 years ago) about the applicability of classical thermodynamics to some phase transitions [Ubbelohde (1956). Brit. J. Appl. Phys. 7, 313-321]. However, Y. Mnyukh's studies of enantiotropic phase transitions in eight organic crystals showed that all proceed by a nucleation-and-growth mechanism [summarized in Mnyukh (2001), Fundamentals of Solid State Phase Transitions, Ferromagnetism and Ferroelectricity. 1st Books]. Nucleation is localized at defects in the parent phase; growth can be epitaxic and oriented if parent and daughter phases have closely similar structures, or random (not oriented) if there are substantial structural differences. This conclusion is supported by a critical review of Mnyukh's eight examples and other results published in the interim. It seems that Ubbelohde's invocation of "hybrid crystals" and "smeared transitions" can mostly be accounted for by lack of equilibrium in the phase-transition studies cited by him. However, the intermediate phase in 4,4'-dichlorobenzophenone appears to have structural resemblances to Ubbelohde's' "hybrid crystal".

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“…Saito, 1992, private communication to Nakayama et al, 1995). We quote from Nakayama: 'The lower phase transition is of second order with the entropy of transition 0.334 J mol À1 K À1 .…”

Section: Table 10mentioning

confidence: 99%

On the mechanism of some first-order enantiotropic solid-state phase transitions: from Simon through Ubbelohde to Mnyukh

Herbstein

2006

Acta Crystallogr B Struct Sci

118

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“…The 4,4 H -dichlorobenzophenone (DCBP) crystal attracts special attention, because an intriguing sequence of phase transitions has been reported for this compound around 190 K at ambient pressure. Nakayama et al, 1994;Nakayama et al, 1995;Peretti & Ranson, 1979;Wolfenson et al, 1990, and the literature quoted therein). These transitions have been extensively studied by NMR, NQR, Raman, thermal etc.…”

Section: Introductionmentioning

confidence: 98%

“…Crystals consisting of¯exible carbonyl molecules make up a rather large group of solids, in which temperature and pressure are able to produce changes in the ®ne balance of intra-and intermolecular interactions (Chan, 1987;Nakayama et al, 1994Nakayama et al, , 1995Kirin & Pawley, 1982, 1987Peretti & Ranson, 1979). The 4,4 H -dichlorobenzophenone (DCBP) crystal attracts special attention, because an intriguing sequence of phase transitions has been reported for this compound around 190 K at ambient pressure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the structural phase transitions near 190 K in 4,4′-dichlorobenzophenone

Mitkevich

Lirtsman

Strzhemechny

et al. 1999

Acta Crystallogr Sect B

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X-ray structure studies have been carried out on single crystals of 4,4'-dichlorobenzophenone at temperatures from 164 to 295 K. The structure determined at 164 K is monoclinic I2/c. Crystal data: T = 164 K; a = 24.527 (6), b = 6.064 (1), c = 7.457 (4) Å; beta = 100.10 (2) degrees; V = 1091.9 (6) Å(3); Z = 4; d(c) = 1.528 g cm(-3); lambda(Mo Kalpha) = 0.71073 Å; µ = 0.565 mm(-1); F(000) = 512; R = 0.04. The temperature dependence of the unit-cell parameters and of the intensities of some symmetry-sensitive reflections has been measured over the range 164-293 K, both in warm-up and cool-down experiments. It has been established that the phase transformation between the C2/c and I2/c structures occurs as a sequence of two closely spaced first-order phase transitions. In between these phase transitions the crystal is in an intermediate state whose structure is different from both C2/c and I2/c. The experimental data give us ground to suppose that the intermediate state is disordered, having a primitive cell half as large as in the two ordered phases. Within the temperature interval where the said intermediate state exists the thermal expansivity along axis c is negative.

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NQRS Data for C13H10Cl2 (Subst. No. 1401)

Chihara¹,

Nakamura²

2010

Substances Containing C10H16 … Zn

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Structure and dynamics of a series of crystals of butterfly-like molecules as studied by 35Cl NQR, and 1H and 19F NMR

Cited by 7 publications

References 11 publications

On the mechanism of some first-order enantiotropic solid-state phase transitions: from Simon through Ubbelohde to Mnyukh

On the mechanism of some first-order enantiotropic solid-state phase transitions: from Simon through Ubbelohde to Mnyukh

Investigation of the structural phase transitions near 190 K in 4,4′-dichlorobenzophenone

NQRS Data for C13H10Cl2 (Subst. No. 1401)

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