The use of the electron paramagnetic resonance of Gd3+ impurity ions and infrared spectra to study the phase transitions in NH4Ce(SO4)2∙4H2O single crystals

Malhotra, V. M.; Buckmaster, H. A.; Bist, H. D.

doi:10.1139/p80-221

Cited by 21 publications

(3 citation statements)

References 13 publications

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“…The OH stretching modes appear at lower frequencies than in a free water molecule and this points to hydrogen bounds of moderate to weak strengths in agree-ment with the O…O distances reported [5]. The Cu O w coordination causes a down shifting of the water bending vibrations, while hydrogen bonding leads to an up shifting of these modes [14]. Therefore, the wavenumber of water bending modes is not much altered.…”

Section: H 2 O 6ibrationssupporting

confidence: 70%

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Raman and FTIR spectra of [Cu(H2O)6](BrO3)2 and [Al(H2O)6](BrO3)3 · 3H2O

Bushiri

Nayar

2002

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Raman and FTIR spectra of [Cu(H2O)6](BrO3)2 and [Al(H2O)6](BrO3)3 x 3H2O are recorded and analyzed. The observed bands are assigned on the basis of BrO3- and H2O vibrations. Additional bands obtained in the region of v3 and v1 modes in [Cu(H2O)6](BrO3)2 are due to the lifting of degeneracy of v3 modes, since the BrO3- ion occupies a site of lower symmetry. The appearance v1 mode of BrO3- anion at a lower wavenumber (771 cm(-1)) is attributed to the attachment of hydrogen to the BrO3- anion. The presence of three inequivalent bromate groups in the [Al(H2O)6](BrO3)3 x 3H2O structure is confirmed. The lifting of degeneracy of v4 mode indicates that the symmetry of BrO3- anion is lowered in the above crystal from C3v to C1. The appearance of additional bands in the stretching and bonding mode regions of water indicates the presence of hydrogen bonds of different strengths in both the crystals. Temperature dependent Raman spectra of single crystal [Cu(H2O)6](BrO3)2 are recorded in the range 77-523 K for various temperatures. A small structural rearrangement takes place in BrO3- ion in the crystal at 391 K. Hydrogen bounds in the crystal are rearranging themselves leading to the loss of one water molecule at 485 K. This is preceded by the reorientation of BrO3- ions causing a phase transition at 447 K. Changes in intensities and wavenumbers of the bands and the narrowing down of the bands at 77 K are attributed to the settling down of protons into ordered positions in the crystal.

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Section: H 2 O 6ibrationssupporting

confidence: 70%

“…But correlation of Al atoms to the water O atoms causes a downward shift. Therefore, the intense OH bending modes appear without any shift in wavenumber values [13,14].…”

Section: H 2 O 6ibrationsmentioning

confidence: 99%

Raman and FTIR spectra of [Cu(H2O)6](BrO3)2 and [Al(H2O)6](BrO3)3 · 3H2O

Bushiri

Nayar

2002

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Below T,,, new bands in the IR spectra, due to the H,O molecules and the SO:-ions, were observed [5], as compared to that at RT.…”

Section: Discussionmentioning

confidence: 86%

EPR of a Gd³⁺‐Doped NH₄Pr(SO₄)₂ · 4 H₂O Single Crystal. Study of Phase Transition and Superposition Model Calculation of Zero‐Field Splitting Parameters

Misra

1990

Physica Status Solidi (b)

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Infrared and polarized Raman spectra of TlLa(SO₄)₂ · 2H₂O

Mathew¹,

Suresh²,

Pradeep³

et al. 1990

J Raman Spectroscopy

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IR and polarized Raman spectra of a TILa(SO,), -2H,O crystal were recorded and analysed. The bands observed in the internal mode region of the SO:-ion indicate the presence of two crystallographically distinct SO:-ions in the crystal, in agreement with the x-ray diffraction data. These SO:-ions have stronger S-0 bonds than a free SO, ion. The water molecule forms hydrogen bonds of medium strength.

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The use of the electron paramagnetic resonance of Gd³⁺ impurity ions and infrared spectra to study the phase transitions in NH₄Ce(SO₄)₂∙4H₂O single crystals

Abstract: Dc,pcrrttuetrt q f P l~y s i c s , Tlre Unico.sity q/'Crrlga,y, Colgcrry, Alto., Cot~crcln T2N IN4

Cited by 21 publications

References 13 publications

Raman and FTIR spectra of [Cu(H2O)6](BrO3)2 and [Al(H2O)6](BrO3)3 · 3H2O

Raman and FTIR spectra of [Cu(H2O)6](BrO3)2 and [Al(H2O)6](BrO3)3 · 3H2O

EPR of a Gd³⁺‐Doped NH₄Pr(SO₄)₂ · 4 H₂O Single Crystal. Study of Phase Transition and Superposition Model Calculation of Zero‐Field Splitting Parameters

Infrared and polarized Raman spectra of TlLa(SO₄)₂ · 2H₂O

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The use of the electron paramagnetic resonance of Gd3+ impurity ions and infrared spectra to study the phase transitions in NH4Ce(SO4)2∙4H2O single crystals

Abstract: Dc,pcrrttuetrt q f P l~y s i c s , Tlre Unico.sity q/'Crrlga,y, Colgcrry, Alto., Cot~crcln T2N IN4

Cited by 21 publications

References 13 publications

Raman and FTIR spectra of [Cu(H2O)6](BrO3)2 and [Al(H2O)6](BrO3)3 · 3H2O

Raman and FTIR spectra of [Cu(H2O)6](BrO3)2 and [Al(H2O)6](BrO3)3 · 3H2O

EPR of a Gd3+‐Doped NH4Pr(SO4)2 · 4 H2O Single Crystal. Study of Phase Transition and Superposition Model Calculation of Zero‐Field Splitting Parameters

Infrared and polarized Raman spectra of TlLa(SO4)2 · 2H2O

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The use of the electron paramagnetic resonance of Gd³⁺ impurity ions and infrared spectra to study the phase transitions in NH₄Ce(SO₄)₂∙4H₂O single crystals

EPR of a Gd³⁺‐Doped NH₄Pr(SO₄)₂ · 4 H₂O Single Crystal. Study of Phase Transition and Superposition Model Calculation of Zero‐Field Splitting Parameters

Infrared and polarized Raman spectra of TlLa(SO₄)₂ · 2H₂O