Deuterated methylene iodide at high pressures: a Raman study

Lee, S.A.; Anderson, A.

doi:10.1016/0009-2614(96)01075-5

Cited by 3 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…22 Hence we have studied a series of simple halomethanes, the smallest organic molecules arranging according to hardly disturbed halogen‚‚‚ halogen and hydrogen‚‚‚halogen forces, which often have decisive role for the crystal symmetry and properties. [23][24][25] Dihalomethanes were intensely studied in low temperatures by powder diffraction [26][27][28] and spectroscopic methods, [29][30][31][32][33][34][35][36] but no information about most of their structures at varied temperature and pressure have been reported. We have determined these unknown crystal structures and found that dihalomethanes exhibit characteristic phase transitions and systematic isostructural relations, summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…Dihalomethanes were intensely studied in low temperatures by powder diffraction − and spectroscopic methods, − but no information about most of their structures at varied temperature and pressure have been reported. We have determined these unknown crystal structures and found that dihalomethanes exhibit characteristic phase transitions and systematic isostructural relations, summarized in Table .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH₂ClI and CH₂I₂

Podsiadło

Katrusiak

2008

J. Phys. Chem. B

View full text Add to dashboard Cite

Isostructural relations and phase transitions of dihalomethanes have been rationalized by the competing patterns of CH...halogen hydrogen bonds and halogen...halogen interactions, the common weak directional interactions in soft organic matter. Pressure-frozen chloroiodomethane, CH(2)ClI, at 295 K and 0.72 GPa forms centrosymmetric phase III, which at ca. 400 K and 1.6 GPa disproportionates into CH(2)Cl(2) and CH(2)I(2). The directional character of intermolecular contacts between halogen atoms results from the characteristic anisotropic charge distribution on molecular surface.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH₂ClI and CH₂I₂

Podsiadło

Katrusiak

2008

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

Isostructural relations in dihalomethanes and disproportionation of bromoiodomethane

Podsiadło

Katrusiak

2008

CrystEngComm

View full text Add to dashboard Cite

The directional character of halogen/halogen forces has been evidenced by specific structural features of bromoiodomethane crystals, CH 2 BrI. The crystals were in-situ grown in isobaric conditions in a glass capillary and in isothermal and isochoric conditions in a diamond-anvil cell, and the structures have been determined by single-crystal X-ray diffraction at 0.10 MPa/220 K, 0.10 MPa/100 K, 0.54 GPa/295 K. The freezing point for isothermal compression at 295 K is 0.47 GPa. At 0.80 GPa/490 K CH 2 BrI disproportionates to CH 2 I 2 and CH 2 Br 2 . The ambient-pressure/low-temperature and 0.54 GPa/ambient-temperature CH 2 BrI crystals are monoclinic, space-group C2/c, isostructural with CH 2 Br 2 , CH 2 I 2 and CH 2 BrCl phases. High-pressure structure of CH 2 I 2 , determined at 0.80 GPa/295 K, is orthorhombic, space-group Fmm2. Crystals of CH 2 Br 2 , CH 2 BrI and CH 2 I 2 are 2-dimensionally isostructural. The polar arrangement of molecular sheets in CH 2 I 2 is favoured by CH/I hydrogen bonds, which are absent in the centrosymmetric CH 2 BrI structure. The temperature at which CH 2 BrI disproportionates into CH 2 Br 2 and CH 2 I 2 is raised by pressure, as this process requires that CH 2 BrI be liquid.

show abstract

Molecular interactions in crystalline dibromomethane and diiodomethane, and the stabilities of their high-pressure and low-temperature phases

Podsiadło¹,

Dziubek²,

Szafrański³

et al. 2006

Acta Crystallogr Sect B

View full text Add to dashboard Cite

Dibromomethane, CH2Br2, and diiodomethane, CH2I2, have been in situ pressure-crystallized in a diamond-anvil cell and their structures determined by single-crystal X-ray diffraction at 0.61 and 0.16 GPa, respectively. The pressure-frozen CH2Br2 crystal is isostructural with its C2/c phase obtained by cooling. CH2I2 is known to form several phases at low temperature, one of which is isostructural with CH2Br2. However, pressure freezing leads to the polar Fmm2 phase. The formation of the polar CH2I2 structure at 0.16 GPa has been rationalized by the electrostatic and anisotropic van der Waals interactions of the I atoms. No ferroelectric behaviour of the Fmm2 polar phase II of CH2I2 has been determined. The diffraction, calorimetric and dielectric constant studies reveal considerable temperature hysteresis of transformations between the CH2I2 phases, as well as metastable regions strongly dependent on the sample shape and history.

show abstract

Deuterated methylene iodide at high pressures: a Raman study

Cited by 3 publications

References 4 publications

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH₂ClI and CH₂I₂

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH₂ClI and CH₂I₂

Isostructural relations in dihalomethanes and disproportionation of bromoiodomethane

Molecular interactions in crystalline dibromomethane and diiodomethane, and the stabilities of their high-pressure and low-temperature phases

Contact Info

Product

Resources

About

Deuterated methylene iodide at high pressures: a Raman study

Cited by 3 publications

References 4 publications

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH2ClI and CH2I2

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH2ClI and CH2I2

Isostructural relations in dihalomethanes and disproportionation of bromoiodomethane

Molecular interactions in crystalline dibromomethane and diiodomethane, and the stabilities of their high-pressure and low-temperature phases

Contact Info

Product

Resources

About

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH₂ClI and CH₂I₂

Competing Patterns of Weak Directional Forces in Pressure-Frozen CH₂ClI and CH₂I₂