Neutron diffraction study of structural phase transition in (NH4)2Se2O5

Makarova, I. P.; Muradyan, L. A.; Vinogradova, I. S.; Simonov, V. I.

doi:10.1080/00150199008221551

Cited by 3 publications

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“…MSe 2 O 5 (M = Pb, Cd, Mn) and Cr 2 (Se 2 O 5 ) 3 are also known and have been characterized by vibrational spectroscopy . The ammonium salt of diselenite, (NH 4 ) 2 Se 2 O 5 , has been studied by neutron diffraction and shown to undergo a phase transition at 312 K. − Despite the presence of two lone-pairs of electrons on the diselenite anion, most compounds are centrosymmetric; notable exceptions include LiFe(Se 2 O 5 ) 2 , Nb 2 Se 4 O 13 , Nd 2 (Se 2 O 5 ) 3 ·H 2 SeO 3 ·2H 2 O, and In 2 (Se 2 O 5 ) 3 . Small second-harmonic generation responses have been observed for the frequency-doubling of 1064 nm light by In 2 (Se 2 O 5 ) 3 .…”

Section: Introductionmentioning

confidence: 99%

Selenium Oxoanion Compounds of Palladium(II)

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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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