Crystal Structures and Properties of Eu2GeSe4 and Eu2Ge2Se5
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M. Tampier
,
R. Pöttgen
Europium selenogermanate(IV) and Europium selenogermanate(III) were synthesized by direct reactions of the elements at 1023 K and their crystal structures determined by single crystal methods. α-Eu2GeSe4 (P21, a = 6.964(1), b = 7.055(2), c = 8.400(2) Å , β = 108.12(2)˚, Z = 2) crystallizes as a polar variant of the monoclinic Sr2GeS4-type at room temperature. At 673 K, the structure is centrosymmetric (β-Eu2GeSe4, P21/m, a = 6.969(1), b = 7.059(2), c = 8.516(2)Å , β = 107.99(2)˚, Z = 2), and a phase transition P21→P21/m as known from Eu2GeS4 is highly probable. Eu2Ge2Se5 (P21/n, a = 8.421(4), b = 12.235(4), c = 9.127(3) Å,β = 93.67(4)˚, Z = 4) crystallizes in the Sr2Ge2Se5 type, mainly characterized by complex [Ge4Se10]8- anions with homonuclear Ge-Ge bonds. Both compounds are deep red Zintl phases according to (Eu2+)2Ge4+(Se2-)4 and (Eu2+)2(Ge3+)2(Se2-)5. Magnetic susceptibility measurements show paramagnetic behavior above 20Kwith magnetic moments of 8.00(5) μB/Eu and 8.10(5) μB/Eu, respectively, indicating Eu2+. Eu2Ge2Se5 orders antiferromagnetically at TN = 4.2(2) K and undergoes a metamagnetic transition at 2 K at a critical field of 0.5(3) T. The saturation moment at 2.2 K and 5.5 T is 7.00(2) μB/Eu. Eu2GeSe4 is a ferromagnet with TC = 5.8(2) K and a saturation moment at 2.2 K and 5.5 T of 6.92(2) μB/Eu. 151Eu Mössbauer spectroscopic measurements of Eu2GeSe4 and Eu2Ge2Se5 at 78 K show isomer shifts of -12.43(4) mm/s and -12.69(5) mm/s, respectively, in accordance with divalent europium.
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Artikel in diesem Heft
- Crystal Structures and Properties of Eu2GeSe4 and Eu2Ge2Se5
- Gallium-Gallium Single Bonds Terminally Coordinated by Tropolonato Ligands
- Synthesis and Structures of Bis(pentafluorophenyl) Selenoxide / Telluroxide
- Experimental and Theoretical Study on the Structure of Nitramide H2NNO2
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- Quaternary Phosphide Oxides Pr3Cu4P4O2–x and Sm3Cu4P4O2–x with Ordered Zr3Cu4Si6-Type Structure
- S-, X-, Q- undW-Band-Pulver-EPR-Untersuchungen am mononuklearen AuII-Komplex [AuII([9]anS3)2](BF4)2 / S-, X-, Q- und W-Band Powder-EPR Investigations on the Mononuclear AuII-Complex [AuII([9]aneS3 )2](BF4)2
- Supersilyliertes Ammoniak und supersilyliertes Hydrazin: Synthese, Struktur und Eigenschaften / Supersilyl Ammonia and Supersilyl Hydrazine: Synthesis, Structure and Properties
- Synthesis and Structure of trans-Dichloro-tetra(pyrazole)-gallium(III) Chloride and Tetrachlorogallate(III)
- Synthesis and Characterization of Mn6(PO4)4·H2O, a New Metal(II) Phosphate Hydrate
- Carbon Supported Pt+Os Catalysts for Methanol Oxidation
- The Molecular Structures of the Three Disilylbenzenes Determined in the Gas Phase, the Solid State and by ab initio Calculations
- Anodische Oxidation von 2-Thiobarbitursäuren unter Bildung neuartiger, tetracyclischer Dimerer / Anodic Oxidation of 2-Thiobarbituric Acids under Formation of New Tetracyclic Dimers
- Multinuclear (1H, 13C and 15N) Magnetic Resonance Spectroscopy and Substituent Effects on N-Phenoxyethylanilines
- Two New Triterpenes from Fern Adiantum incisum
- Pollen Growth Regulator, Fusanolide A, and a Related Metabolite from Fusarium sp.
- Synthesis of C-Glycosides from S-Glycosyl Phosphorothioates
- Liegen in Imidazolium-Tetrafluoroboraten Wasserstoffbrückenbindungen vor? Die Struktur von 1,3-Diisopropyl-4,5-dimethylimidazolium- Tetrafluoroborat [1] / Is Hydrogen Bonding Present in Imidazolium Tetrafluoroborates? The Structure of 1,3-Diisopropyl-4,5-dimethylimidazolium Tetrafluoroborate [1]
- Magnesium Anthranilate Dihydrate
- Tri(1-cyclohepta-2,4,6-trienyl)- phosphane, P(C7H7)3, as a Tripodal Tetradentate Ligand in Cationic, Five-coordinate Complexes of Platinum(II) and Palladium(II)
Artikel in diesem Heft
- Crystal Structures and Properties of Eu2GeSe4 and Eu2Ge2Se5
- Gallium-Gallium Single Bonds Terminally Coordinated by Tropolonato Ligands
- Synthesis and Structures of Bis(pentafluorophenyl) Selenoxide / Telluroxide
- Experimental and Theoretical Study on the Structure of Nitramide H2NNO2
- Crystal and Molecular Structure of 1,2,4-Triazolium Chloride and its Salt with Antimony Trichloride - Bis(1,2,4-triazolium) pentachloroantimonate(III)-1,2,4-triazolium Chloride
- Quaternary Phosphide Oxides Pr3Cu4P4O2–x and Sm3Cu4P4O2–x with Ordered Zr3Cu4Si6-Type Structure
- S-, X-, Q- undW-Band-Pulver-EPR-Untersuchungen am mononuklearen AuII-Komplex [AuII([9]anS3)2](BF4)2 / S-, X-, Q- und W-Band Powder-EPR Investigations on the Mononuclear AuII-Complex [AuII([9]aneS3 )2](BF4)2
- Supersilyliertes Ammoniak und supersilyliertes Hydrazin: Synthese, Struktur und Eigenschaften / Supersilyl Ammonia and Supersilyl Hydrazine: Synthesis, Structure and Properties
- Synthesis and Structure of trans-Dichloro-tetra(pyrazole)-gallium(III) Chloride and Tetrachlorogallate(III)
- Synthesis and Characterization of Mn6(PO4)4·H2O, a New Metal(II) Phosphate Hydrate
- Carbon Supported Pt+Os Catalysts for Methanol Oxidation
- The Molecular Structures of the Three Disilylbenzenes Determined in the Gas Phase, the Solid State and by ab initio Calculations
- Anodische Oxidation von 2-Thiobarbitursäuren unter Bildung neuartiger, tetracyclischer Dimerer / Anodic Oxidation of 2-Thiobarbituric Acids under Formation of New Tetracyclic Dimers
- Multinuclear (1H, 13C and 15N) Magnetic Resonance Spectroscopy and Substituent Effects on N-Phenoxyethylanilines
- Two New Triterpenes from Fern Adiantum incisum
- Pollen Growth Regulator, Fusanolide A, and a Related Metabolite from Fusarium sp.
- Synthesis of C-Glycosides from S-Glycosyl Phosphorothioates
- Liegen in Imidazolium-Tetrafluoroboraten Wasserstoffbrückenbindungen vor? Die Struktur von 1,3-Diisopropyl-4,5-dimethylimidazolium- Tetrafluoroborat [1] / Is Hydrogen Bonding Present in Imidazolium Tetrafluoroborates? The Structure of 1,3-Diisopropyl-4,5-dimethylimidazolium Tetrafluoroborate [1]
- Magnesium Anthranilate Dihydrate
- Tri(1-cyclohepta-2,4,6-trienyl)- phosphane, P(C7H7)3, as a Tripodal Tetradentate Ligand in Cationic, Five-coordinate Complexes of Platinum(II) and Palladium(II)
