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11272562

Source:http://linkedlifedata.com/resource/pubmed/id/11272562

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pubmed-article:11272562rdf:typepubmed:Citationlld:pubmed
pubmed-article:11272562lifeskim:mentionsumls-concept:C0220781lld:lifeskim
pubmed-article:11272562lifeskim:mentionsumls-concept:C1883254lld:lifeskim
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pubmed-article:11272562pubmed:issue4lld:pubmed
pubmed-article:11272562pubmed:dateCreated2001-3-1lld:pubmed
pubmed-article:11272562pubmed:abstractTextSingle crystals of MnThTe3 (1) and MgThTe3 (2) grow as small black plates from the stoichiometric reaction of the elements, the former at 1,000 degrees C and the latter at 900 degrees C with the aid of a Sn flux. Both compounds crystallize in the space group Cmcm of the orthorhombic system with four formula units in cells of dimensions a = 4.2783(6) A, b = 13.8618(11) A, and c = 9.9568(15) A for 1 and a = 4.2854(6) A, b = 14.042(2) A, and c = 9.9450(14) A for 2 at T = 153(2) K. KCuThSe3 (3) forms as red blocks from a stoichiometric mixture of K2Se, Cu, Th, and Se at 800 degrees C, and CsCuThSe3 (4) forms as yellow blocks from a stoichiometric mixture of Cs2Se3, Cu, Th, and Se at 850 degrees C. Compounds 3 and 4 also crystallize in the space group Cmcm of the orthorhombic system with four formula units in cells of dimensions a = 4.1832(8) A, b = 14.335(3) A, and c = 10.859(2) A for 3 and a = 4.2105(7) A, b = 15.715(3) A, and c = 10.897(2) A for 4 at 153(2) K. Compounds 1 and 2 are isostructural with each other as well as with several uranium analogues and comprise pseudolayered structures with slabs of corner-shared MTe6 octahedra alternating with slabs of cap- and edge-shared ThTe8 bicapped trigonal prisms. The slabs are bonded together through the sharing of edges and vertices of the various polyhedra to form three-dimensional structures. Compounds 3 and 4 are two-dimensional layered structures that are closely related to 1 and 2. In 3 and 4, ThSe6 octahedra form the same slabs as MTe6 in 1 and 2 and Cu atoms occupy the tetrahedral holes in the layers. Alkali metal cations occupy bicapped trigonal prismatic sites between the layers. Neither structure type has short Q-Q interactions, and therefore the oxidation states of all atoms are straightforwardly assigned on the assumption of Th4+. Magnetic susceptibility measurements on compound 1 show a ferromagnetic transition at 70 K and a magnetic moment of 5.9(2) muB per Mn ion, indicating low-spin Mn2+.lld:pubmed
pubmed-article:11272562pubmed:languageenglld:pubmed
pubmed-article:11272562pubmed:journalhttp://linkedlifedata.com/r...lld:pubmed
pubmed-article:11272562pubmed:statusPubMed-not-MEDLINElld:pubmed
pubmed-article:11272562pubmed:monthFeblld:pubmed
pubmed-article:11272562pubmed:issn0020-1669lld:pubmed
pubmed-article:11272562pubmed:authorpubmed-author:IbersJ AJAlld:pubmed
pubmed-article:11272562pubmed:authorpubmed-author:NarducciA AAAlld:pubmed
pubmed-article:11272562pubmed:issnTypePrintlld:pubmed
pubmed-article:11272562pubmed:day21lld:pubmed
pubmed-article:11272562pubmed:volume39lld:pubmed
pubmed-article:11272562pubmed:ownerNLMlld:pubmed
pubmed-article:11272562pubmed:authorsCompleteYlld:pubmed
pubmed-article:11272562pubmed:pagination688-91lld:pubmed
pubmed-article:11272562pubmed:dateRevised2003-10-31lld:pubmed
pubmed-article:11272562pubmed:year2000lld:pubmed
pubmed-article:11272562pubmed:articleTitleThe related compounds MThTe3 (M = Mn, Mg) and ACuThSe3 (A = K, Cs): syntheses and characterization.lld:pubmed
pubmed-article:11272562pubmed:affiliationDepartment of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.lld:pubmed
pubmed-article:11272562pubmed:publicationTypeJournal Articlelld:pubmed