| | 1 | Author
| JanKarsten Schaefer, Bluhm | Requires cookie* | | | Title
| C  | | | | Abstract
| uT m 2[ B 20 5] 2: D as erste "M etaborat" mit einem x [ B 20 5] 4 -Anion CuTm2[B20 5]2: The First " Metaborate" with a ^ [ B ^ s ] 4 -Anion Single crystals o f the compound CuTm2[B 20 3]2 were obtained by a B20 3 flux technique. The compound contains a hitherto unknown metaborate anion with the formula ^ [ ^ O s ] 4-. It crystallizes in the monoclinic space group C|h-P2!/c with a = 452.18(7); b = 720.0(2); c = 929.2(5) pm; ß -90.16(5)°; Z = 2. The metaborate layers consists of four and eight membered rings of edge-sharing B 0 4-tetrahedra resembling the complex anion in the isotypic gadolinite structure of F e Y 2[B eS i0 3]2. The layers are connected via copper-centered elongated oxygen octahedra and slightly distorted thulium-centered tetragonal oxygen antiprisms. | | | |
Reference
| Z. Naturforsch. 50b, 630—634 (1995); eingegangen am 2. August/11. November 1994 | | | |
Published
| 1995 | | | |
Keywords
| Copper, Thulium, Borate, Synthesis, Crystal Structure | | | |
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| default:Reihe_B/50/ZNB-1995-50b-0630.pdf | | | | Identifier
| ZNB-1995-50b-0630 | | | | Volume
| 50 | |
| 2 | Author
| J. Schaefer, K. Bluhm | Requires cookie* | | | Title
| Synthese und Kristallstruktur von CuLn2[B20 5]2 (Ln = Er3*, Lu3+): zwei Kupferlanthanoidborate m it^ [B 20 5 ]4_-A nionen Synthesis and Crystal Structure of CuLn2[B20 5]2 (Ln = E r3+, Lu3+): Two Copper Lanthanoid B orates with 2.[B20 5]4~-Anions | | | | Abstract
| Single crystals of the new com pounds CuLn2[B20 5]2 (Ln = Er3+(I), Lu3+(II)) were ob tained by a B9O 3 flux-technique. They crystallize in the space group C ih -P 2 \lc with I: a = 453.14(6); b = 721.94(5); c = 929.5(4) pm; ß = 90.01(3)°; Z = 2 und II: a = 451.4(4); b = 718.3(1); c = 928.1(3) pm; ß = 90.00(6)°; Z = 2. The compounds are isotypic to CuTm2[B20 5 ] 2 as well as to the mineral Gadolinite (FeY 2 [B eSi0 5 ]2) and exhibit layer like 2.[B20 5]4 --anions consisting of edge sharing B 0 4 -tetrahedra, which form four-and eight-membered rings. The borate anions are separated by layers of elongated C u 0 6-octahedra and slightly distorted tetragonal L n 0 8-antiprisms. | | | |
Reference
| Z. Naturforsch. 50b, 1141—1145 (1995); eingegangen am 19. Januar 1995 | | | |
Published
| 1995 | | | |
Keywords
| Copper, Erbium, Lutetium, Borate, Crystal Structure | | | |
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| default:Reihe_B/50/ZNB-1995-50b-1141.pdf | | | | Identifier
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| 50 | |
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