Vibrational spectra of three anhydrous rare-earth selenites R2Se3O9 (R=La, Sm and Lu)

Gopinath, Anish; Devanarayanan, S.; Castro, A.

doi:10.1016/s1386-1425(97)00275-8

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…The IR spectra of complexes 1 − 5 show a broad band at about 3390 cm −1 attributable to ν(OH) stretching of water. The spectra of 1 − 4 also show four bands that can be assigned to the coordinated selenite group . The bands around 870 and 770 cm −1 can be attributed to the non-degenerate symmetry stretching vibrations of the SeO 3 2− ion, and the most intense band at 740 cm −1 is characteristic of the asymmetric stretching vibration of Se−O modes for selenides, and the other at 460 cm −1 is assigned to the O−Se−O bending mode.…”

Section: Resultsmentioning

confidence: 96%

“…23 The bands around 870 and 770 cm -1 can be attributed to the non-degenerate symmetry stretching vibrations of the SeO 3 2-ion, and the most intense band at 740 cm -1 is characteristic of the asymmetric stretching vibration of Se-O modes for selenides, and the other at 460 cm -1 is assigned to the O-Se-O bending mode. In addition, the spectra of the phenanthroline (1,3) and bipyridine (2,4) complexes show bands around 1620, 1515, 850, and 720 cm -1 for phen complexes and 760 and 729 cm -1 for bipy complexes, and these are typical for coordinated phen and bipy.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and X-ray Structures of a Series of Heteroleptic Selenites of Copper

et al. 2009

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The reactions of [Cu(R-pySe)], R = H, 3-CF3, with 2,2′-bipyridine or 1,10-phenanthroline in acetonitrile yielded the one-dimensional complexes {[Cu(SeO3)(phen)]·2(H2O)} n , 1, {[Cu(SeO3)(bipy)]·2(H2O)} n , 2. Recrystallization of 1 and 2 from a 1:1 methanol/water mixture led to the formation of the dinuclear complexes [Cu(SeO3)(phen)(H2O)]2, 3, and [Cu(SeO3)(bipy)(H2O)]2, 4. Single crystal X-ray diffraction analysis revealed that 1 and 2 have a polymeric structure in which each oxygen atom of the selenite group coordinates to a copper atom. The two other coordination positions are occupied by two nitrogen atoms of the organic ligand, and this defines an almost square pyramidal geometry around the metal. Both compounds show a very weak antiferromagnetic coupling (J = −0.9 for 1 and −0.6 cm−1 for 2). Compounds 3 and 4 consist of dinuclear species with the copper atoms lying in a square pyramidal geometry in which the selenite group acts as a bridge between two copper atoms and one oxygen atom is uncoordinated. The two copper ions in 3 show antiferromagnetic coupling with J = −22.1 cm−1.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Synthesis and X-ray Structures of a Series of Heteroleptic Selenites of Copper

et al. 2009

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“…Такого рода комплексы, например (BO 3 ) 2− [9,14], (PO 4 ) 3− [44], (MoO 4 ) 2− [10], так же как и (SeO 3 ) 2− , помещенные в кристаллическое окружение, как правило, сохраняют колебательные частоты близкими к частотам свободного комплекса, что существенно облегчает анализ фононного спектра. Колебательные свойства селенитной группировки (SeO 3 ) 2− были ранее исследованы для ряда соединений [45][46][47][48]. Для анализа вклада группы селенита в фононный спектр франциситоподобных фаз необходимо провести корреляционный анализ для нормальных колебаний группы (SeO 3 ) 2− и сравнение с экспериментальными данными.…”

Section: Introductionunclassified

“…Частота каждого из нормальных колебаний немного изменяется, когда молекулярная группа находится в конкретной матрице. Основываясь на работах[45][46][47], в которых исследовались частоты колебаний молекулярной группы (SeO 3 ) 2− в разных кристаллах, мы определили примерный интервал частот для каждого из колебаний, показанный сверху на рис. 2.…”

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Химическое сжатие, структурная нестабильность и ИК-активные фононы в ряду редкоземельных аналогов францисита Cu-=SUB=-3-=/SUB=-RE(SeO-=SUB=-3-=/SUB=-)-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-Cl

Новикова¹,

Яковлев²,

Кузнецова³

et al. 2022

Оптика И Спектроскопия

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ATR and transmission spectra of a series of rare-earth francisite-like phases Cu3RE(SeO3)2O2Cl (RE is a rare earth element, RE = Nd, Sm, Eu, Gd, Dy, Ho, Tm, Yb) were studied. The frequencies of the IR-active phonons of the crystals under study were determined. In the dependences of phonon frequencies on the ionic radius in a series of isostructural compounds, two tendencies are observed: a hardening of frequencies due to an increase in chemical pressure and a softening of the vibration frequencies, in which rare-earth ions are involved, due to an increase in the mass of a specific rare-earth ion. In the Cu3Dy(SeO3)2O2Cl crystal, an anomalous softening of low-frequency phonons at low temperatures was observed, which was apparently associated with the structural instability of the compound.

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IR Spectra of Minerals and Related Compounds, and Reference Samples Data

Чуканов¹,

Вигасина²

2019

Vibrational (Infrared and Raman) Spectra of Minerals and Related Compounds

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Vibrational spectra of three anhydrous rare-earth selenites R2Se3O9 (R=La, Sm and Lu)

Cited by 5 publications

References 10 publications

Synthesis and X-ray Structures of a Series of Heteroleptic Selenites of Copper

Synthesis and X-ray Structures of a Series of Heteroleptic Selenites of Copper

Химическое сжатие, структурная нестабильность и ИК-активные фононы в ряду редкоземельных аналогов францисита Cu-=SUB=-3-=/SUB=-RE(SeO-=SUB=-3-=/SUB=-)-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-Cl

IR Spectra of Minerals and Related Compounds, and Reference Samples Data

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