Crystal Structures and Electronic Absorption Spectra of Two Modifications of Cr(SeO2OH)(Se2O5)

Wildner, Manfred; Andrut, M.

doi:10.1006/jssc.1997.7595

Cited by 12 publications

(6 citation statements)

References 22 publications

(13 reference statements)

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“…The Se(IV) centers are three coordinated, their coordination geometry can be considered as a -SeO 3 tetrahedron in which the fourth site is occupied by the lone pair electrons. Within the diselenite anion, the Se-O (bridging) distances (1.829(5) and 1.844(5)Å) are much longer than those of Se-O (terminal) (1.656(5)-1.674(5)Å), which is similar to those observed in other metal diselenites [10][11][12][13][14][15][16]. The diselenite anion is hexadentate, forming a four-membered chelating ring by using a selenite group (La1-O1-Se1-O3) and a six-membered chelating ring by using two selenite groups (La1d-O2-Se1-O3-Se2-O4), and also bridges with two other lanthanum(III) ions (La1c and Fig.…”

Section: Resultssupporting

confidence: 68%

“…Selenium(IV) forms selenite (SeO 3 2− ), hydrogenselenite (HSeO 3 − ) and diselenite (Se 2 O 5 2− ) depending on the conditions in solution [11]. Though a number of transition metal and main group metal diselenites have been isolated [10][11][12][13][14][15], to best of our knowledge only three lanthanide diselenites, namely, Pr(HSeO 3 )(H 2 SeO 3 )(Se 2 O 5 ), Nd 2 (Se 2 O 5 ) 3 (H 2 SeO 3 )(H 2 O) 2 and Y(NO 3 )(Se 2 O 5 )·3H 2 O, have been reported [16]. In our attempt to synthesize an organically templated lanthanum(III) selenite, we obtained a novel layered lanthanum(III) diselenite hydrogenselenite, La(Se 2 O 5 )(HSeO 3 )(H 2 O)·H 2 O instead.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, crystal structure and characterization of a new layered lanthanum(III) diselenite hydrogenselenite: La(Se2O5)(HSeO3)(H2O)·H2O

Feng

Mao

2005

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure and characterization of a new layered lanthanum(III) diselenite hydrogenselenite: La(Se2O5)(HSeO3)(H2O)·H2O

Feng

Mao

2005

Journal of Alloys and Compounds

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“…Magnetic ordering has been observed in diselenite compounds, e.g., in M 2 (Se 2 O 5 ) 3 (M = Cr, Mn, Fe 30 ). Mixed selenite/diselenite compounds have also been reported and include Ca 2 (HSeO 3 ) 2 (Se 2 O 5 ), , Ca 2 (SeO 3 )(Se 2 O 5 ), Au 2 (SeO 3 ) 2 (Se 2 O 5 ), M(HSeO 3 )(Se 2 O 5 ) (M = Fe, Cr), Sm 2 (SeO 3 )(Se 2 O 5 ) 2 , La(Se 2 O 5 )(HSeO 3 )(H 2 O)·H 2 O, and Ga(HSeO 3 )(Se 2 O 5 )·1.07H 2 O …”

Section: Introductionmentioning

confidence: 99%

Selenium Oxoanion Compounds of Palladium(II)

Ling

Albrecht‐Schmitt

2007

Inorg. Chem.

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Three new palladium compounds, PdSeO3, PdSe2O5, and Na2Pd(SeO4)2, containing selenium oxoanions of both Se(IV) and Se(VI) have been prepared under mild hydrothermal conditions. PdSe2O5 and Na2Pd(SeO4)2 both possess one-dimensional structures. Within the structure of PdSe2O5, [PdO4] square planar building blocks are joined together through diselenite, Se2O52-, anions, and form a zigzag chain along the c axis. In Na2Pd(SeO4)2, [PdO4] units are connected by two selenate, SeO42-, anions, and extend along the a axis to form a [Pd(SeO4)2]2- chain. Na+ cations reside in the space between the [Pd(SeO4)2]2- chains and act as counter cations. Unlike above two compounds, PdSeO3 exhibits a layered structure. In the structure of PdSeO3, [PdO4] units are connected to each other by corner-sharing and form a zigzag chain along the b axis. The chains are further joined together by tridentate selenite, SeO32-, anions to form layers in the [ab] plane that stack along the c axis. Crystallographic data: (193 K; Mo Kalpha, lambda=0.71073 A): PdSeO3, monoclinic, space group P21/m, a=3.8884(5) A, b=6.4170(8) A, c=6.1051(7) A, beta=96.413(2) degrees, V=151.38(3) A3, Z=2; PdSe2O5, monoclinic, space group C2/c, a=12.198(2) A, b=5.5500(8) A, c=7.200(1) A, beta=107.900(2) degrees , V=463.8(1) A3, Z=4; Na2Pd(SeO4)2, triclinic, space group P, a=4.9349(11) A, b=5.9981(13) A, c=7.1512 (15) A, alpha=73.894(4) degrees, beta=86.124(4) degrees, gamma=70.834(4) degrees, V=192.03(7) A3, Z=1.

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“…Several phases have been reported in which selenium is found in oxidation state 4. [1][2][3][4][5] table 1, describes the existence of different cation arrangements in selenites and as such they are expected to show variation in spectral properties. 2,3,[4][5][6][7][8][9] chalcomenite, cuSeo 3 •2H 2 o, cobaltomenite, coSeo 3 •2H 2 o and ahlfeldite, niSeo 3 •2H 2 o are known as rare secondary minerals.…”

mentioning

confidence: 99%

An Application of near Infrared Spectroscopy to the Study of the Selenite Minerals: Chalcomenite, Clinochalcomenite and Cobaltomenite

Frost

Reddy

Keeffe

2008

Journal of Near Infrared Spectroscopy

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The selection of five naturally occurring selenite minerals that contain two different transition metal ions, Cu 2+ and Co 2+ could be distinguished by near infrared spectroscopy. Dependence of composition on spectral properties is a key to mineral identification and differentiation of the members of the selenite group. The nature of the band positions and splitting of band components in the electronic spectra of Cu 2+ selenites in the region 12,400-8000 cm -1 are in conformity with octahedral geometry distortion. The two split components which are observed for the Co 2+ band near 9000 cm -1 in cobaltomenites are considered as the vibrational satellites of spin-allowed transition 4 T 1g (F) → 4 T 2g (F). Bands observed at 6950 cm -1 , 6810 cm -1 and 6700 cm -1 are the overtones of OH stretches of structural water in selenites and a strong absorption feature near 6700 cm -1 is the result of hydrogen bonding between (SeO 3 ) 2− and H 2 O. These bands are shifted in cobaltomenites. A sharp absorption band at 5170 cm -1 is a common feature in all the spectra of selenite minerals and is the contribution by the combinations of the OH vibrations of water molecules, n 3 and n 1 . A series of overlapping bands around 4500 and 4100 cm -1 is the result of the combination of the vibrational modes of (SeO 3 ) 2− ion in the minerals.

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Crystal Structures and Electronic Absorption Spectra of Two Modifications of Cr(SeO2OH)(Se2O5)

Cited by 12 publications

References 22 publications

Synthesis, crystal structure and characterization of a new layered lanthanum(III) diselenite hydrogenselenite: La(Se2O5)(HSeO3)(H2O)·H2O

Synthesis, crystal structure and characterization of a new layered lanthanum(III) diselenite hydrogenselenite: La(Se2O5)(HSeO3)(H2O)·H2O

Selenium Oxoanion Compounds of Palladium(II)

An Application of near Infrared Spectroscopy to the Study of the Selenite Minerals: Chalcomenite, Clinochalcomenite and Cobaltomenite

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