Liquid-liquid distribution, spectrophotometric, thermal, IR and Raman studies on selenito uranylates

Khandelwal, B. L.; Verma, Vishwnath

doi:10.1016/0022-1902(76)80352-1

Cited by 18 publications

(14 citation statements)

References 15 publications

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“…However, such infrared bands near 900 cm 1 were observed in some synthetic ammonium (900 cm 1 , 1.785Å), potassium (892 cm 1 , 1.790Å; or 880 cm 1 , 1.799Å) and strontium uranyl selenites (909 cm 1 , 1.778Å, X-ray an average 1.821Å). 11,16 The molar ratio Sr : U : Se D 1 : 3 : 2 in the formula of the strontium uranyl selenite hydrate, prepared by Almond and Albrecht-Schmitt, 11 31,32 and Burns 33 and also with uranyl selenite minerals with similar uranyl anion sheet phosphuranylite-type topology, as guilleminite and marthozite. Bands close to 850-860 cm 1 may be also attributed to the 1 UO 2 2C (866.5 cm 1 , 1.747Å; 856.4 cm 1 , 1.756Å).…”

Section: Resultsmentioning

confidence: 99%

“…Khandelwal and Verma 16 and Verma 17 assume that a strong Raman but weak infrared band around 800 cm 1 in the spectra of the uranyl selenite complexes they studied should be due to the 1 SeO 3 2 -and the bands in the Raman spectra at 731 and in the range 814-829 cm 1 to the split 3 SeO 3 2 -, corresponding to the bands around 700-730 cm 1 and 816-838 cm 1 in the infrared spectra. In the infrared spectra, they observed an intense band at 900 cm 1 attributed to the 3 UO 2 2C .…”

Section: Resultsmentioning

confidence: 99%

“…Bäumer et al 15 proved that in the case of infrared spectra of M 2C selenites monohydrates the stretching vibrations of selenite units are located in the regions 760 Ä 1 SeO 3 Ä 855 cm 1 and 680 Ä 3 SeO 3 Ä 775 cm 1 . Khandelwal and Verma 16 and Verma 17 attributed the Raman and infrared bands in the spectra of UO 2 SeO 3 at 381 and 389 (390) cm 1 19 Significant differences in the two spectra were obtained. The DRIFT spectrum showed much greater complexity.Čejka reported the UO 2 2C symmetric stretching mode as two bands at 850 and 820 cm 1 .…”

Section: Introductionmentioning

confidence: 97%

“…This value is high compared to the values of the 2 bending modes above, however, it is in agreement with Khandelwal and Verma's assignment. 16 The value of 4 was not reported 19 but is available from the paper by Khandelwal and Verma. 16 There is the possibility of overlap between the symmetric stretching bands of SeO 3 2 -and UO 2 2C .Čejka suggested that the bands in the infrared spectrum at 820, 471, 738 were attributable to the 1 , 2 and 3 bands of SeO 3 2 -.…”

Section: Introductionmentioning

confidence: 99%

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A Raman spectroscopic study of the uranyl selenite mineral haynesite

Frost

Weier

Reddy

et al. 2006

J. Raman Spectrosc.

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The mineral haynesite, a uranyl selenite, has been characterised by Raman spectroscopy at 298 and 77 K. Two bands at 811.5 and 800.2 cm −1 are assigned to the symmetric stretching modes of the (UO 2 / 2+ and (SeO 3 / 2− units respectively. These values give calculated U-O bond lengths of 1.799 and/or 1.801Å. The broad band at 861.8 cm −1 is assigned to the n 3 antisymmetric stretching mode of the (UO 2 / 2+ (calculated U-O bond length 1.813Å). Additional bands are observed in the 77 K spectrum. In the spectroscopy of selenite compounds, the position of the antisymmetric stretching vibration occurs at lower wavenumbers than the symmetric stretching mode and thus the band at 740.5 cm −1 is attributed to the n 3 antisymmetric stretching vibration of the (SeO 3 / 2− units. The n 4 and the n 2 vibrational modes of the (SeO 3 / 2− units are observed at 418.5 and 472.1 cm −1 . Bands observed at 278.3, 257.3 and 218.8 cm −1 are assigned to OUO bending vibrations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Raman spectroscopic study of the uranyl selenite mineral haynesite

Frost

Weier

Reddy

et al. 2006

J. Raman Spectrosc.

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“…375 (1) 400 (2) 435 (3) 51o (8) 725 ( suggests [11,12] a lowering of the ligand symmetry from C3v to Cs and muitidentate coordination of the selenite through oxygen. And M-O-Se bands at and around 515 and 958 cm-!…”

Section: (Vw)mentioning

confidence: 98%

Thermal and other studies on bivalent metal selenltes

Verma¹,

Khushu²

1989

Journal of Thermal Analysis

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BaSeO3-Z5H~O(I); PbSeO 3.2HzO(ll ) and CdSeO~-3.5H20(III ) were prepared and analysed. Their hygr0sCopicity and Solubility was investigated. These compounds have high thermai Stability, as shown by their TG and DTA data. IR spectra show multi-dentate coordination of selenite to cations, due to considerable splitting of the asymmetric v3 and v4 bands of SeO32 -in the 780-730 cm ~ t and 420-325 cm-~ region.Tentative structures have been proposed involving bridging oxygen atoms.

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Raman spectroscopic study of the schmiederite Pb₂Cu₂[(OH)₄|SeO₃|SeO₄]

Frost

Keeffe

2008

J Raman Spectroscopy

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Raman spectroscopy lends itself to the studies of selenites, selenates, tellurites and tellurates as well as related minerals. The mineral schmiederite Pb 2 Cu 2 [(OH) 4 jSeO 3 jSeO 4 ], is interesting, in that, both selenite and selenate anions occur in the structure. Raman bands of schmiederite at 1095 and 934 cm −1 are assigned to the symmetric and antisymmetric mode of the (SeO 4 ) 2− anions. For selenites, the symmetric stretching mode occurs at a higher position than the antisymmetric stretching mode, as is evidenced in the Raman spectrum of schmiederite. The band at 834 cm −1 is assigned to the symmetric (SeO 3 ) 2− units. The two bands at 764 and 739 cm −1 are attributed to the antisymmetric (SeO 3 ) 2− units. An intense, sharp band at 398 cm −1 is assigned to the n 2 bending mode. The two bands at 1576 and 1604 cm −1 are assigned to the deformation modes of the OH units. The observation of multiple OH bands supports the concept of a much distorted structure. This is based upon the four OH units coordinating the copper in a square planar structure. A single symmetric Raman band is observed at 3428 cm −1 and is assigned to the symmetric stretching mode of the OH units. The observation of multiple infrared OH stretching bands supports the concept of non-equivalent OH units in the schmiederite structure.

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Liquid-liquid distribution, spectrophotometric, thermal, IR and Raman studies on selenito uranylates

Cited by 18 publications

References 15 publications

A Raman spectroscopic study of the uranyl selenite mineral haynesite

A Raman spectroscopic study of the uranyl selenite mineral haynesite

Thermal and other studies on bivalent metal selenltes

Raman spectroscopic study of the schmiederite Pb₂Cu₂[(OH)₄|SeO₃|SeO₄]

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Liquid-liquid distribution, spectrophotometric, thermal, IR and Raman studies on selenito uranylates

Cited by 18 publications

References 15 publications

A Raman spectroscopic study of the uranyl selenite mineral haynesite

A Raman spectroscopic study of the uranyl selenite mineral haynesite

Thermal and other studies on bivalent metal selenltes

Raman spectroscopic study of the schmiederite Pb2Cu2[(OH)4|SeO3|SeO4]

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Raman spectroscopic study of the schmiederite Pb₂Cu₂[(OH)₄|SeO₃|SeO₄]