| | 1 | Author
| Ayhan Elmali3, Yalcin Elermana, Ingrid Svobodab, Hartmut Fuessb, Klaus Griesar0, Wolfgang Haasec | Requires cookie* | | | Title
| Structure and Magnetic Properties of a Dinuclear Copper(II) Complex  | | | | Abstract
| [Cu2L] (L=N-2-hydroxy-4-methylphenyl-4-oxo-2-pentalketimine) was synthesized and its crystal structure determined. C24H?6Cu2N204 monoclinic space group P2|/n with a= 10.978(2), 17.045(3), c= 11.958(2) Ä, ß = 101.89(1)°, V = 2189.6(7) A3,Z = 4. Two copper(II) atoms in a distorted square-planar coordination are bridged by two oxygen atoms to form a dinuclear unit. The copperfll) centers are separated by 3.025(1) A and antiferro-magnetically coupled (7=-222.3 cm), which follows from temperature-dependent magnetic susceptibility measurements in the range 4.2 to 300 K. | | | |
Reference
| Z. Naturforsch. 52b, 157—161 (1997); received September 30 1996 | | | |
Published
| 1997 | | | |
Keywords
| Dinuclear Cu(II) Complex, X-Ray, Structure, Magnetic Properties, Antiferromagnetic Coupling | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0157.pdf | | | | Identifier
| ZNB-1997-52b-0157 | | | | Volume
| 52 | |
| 2 | Author
| R. Pöttgen, K. H. Wachtmann, W. Jeitschko, A. Lang, T. Ebel | Requires cookie* | | | Title
| Er5Re2C7, Tm5Re2C7, and Lu5Re2C7 with Sc5Re2C7 Type, and Yb2ReC2 with Pr2ReC2 Type Structures | | | | Abstract
| ErsReiCy, TmsRe2C7, and LusReaC? were prepared by arc-melting of the elemental compo nents and subsequent annealing at 800 °C. ErsRe^Cy forms only after the annealing process, whereas the other two carbides were already present in the as cast samples. They crystallize with a ScsReiC? type structure, which was refined from single-crystal X-ray data of LusRe2C7: Cmmm, a = 791.44(5), b = 1418.08(8), c = 332.79(2) pm, Z = 2, R = 0.037 for 544 structure factors and 21 variable parameters. The structure contains linear centrosymmetric C3 units with a C-C bond length of 133(2) pm and isolated carbon atoms in octahedral coordination of four lutetium and two rhenium atoms. The rhenium atoms within the two-dimensionally infinite polymeric sheets [ReiC-tln are electronically saturated as is indicated by the diamagnetism and the semiconductivity of this carbide. Yf>2ReC2 was prepared by reacting the elements in a sealed tantalum tube with a high-frequency furnace. It crystallizes with a Pr2ReC2 type structure: Pnma, a = 645.91(6), b = 498.64(6), and c = 966.05(6) pm. Magnetic susceptibility measurements indicate the ytterbium atoms to be trivalent in this compound. | | | |
Reference
| Z. Naturforsch. 52b, 231—236 (1997); received November 15 1996 | | | |
Published
| 1997 | | | |
Keywords
| Crystal Structure, Magnetic Properties, Rare Earth Metal Rhenium Carbides, Polymeric Rhenium-Carbon Polyanions | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0231.pdf | | | | Identifier
| ZNB-1997-52b-0231 | | | | Volume
| 52 | |
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