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  • Walter de Gruyter GmbH  (6)
  • 1
    Online Resource
    Online Resource
    Polymorphism of isotypic series of homoleptic 1,2,3-triazolate MOFs [Ln( Tz* ) 3 ] containing the heavy lanthanides Gd–Lu: from open to dense frameworks of varying dimensionality
    Walter de Gruyter GmbH ; 2010
    In:  Zeitschrift für Kristallographie - Crystalline Materials Vol. 225, No. 5 ( 2010-5-1), p. 187-194
    Details
    In: Zeitschrift für Kristallographie - Crystalline Materials, Walter de Gruyter GmbH, Vol. 225, No. 5 ( 2010-5-1), p. 187-194
    Abstract: Homoleptic MOF structures of the formulas 2 ∞ [Ln( Tz* ) 3 ] and 3 ∞ [Ln( Tz* ) 3 ], ( Tz* ) – = 1,2,3-triazolate anion, C 2 H 2 N 3 – , Ln = Gd-Lu, were obtained by the reaction of the lanthanide metals with the aromatic heterocyclic amine 1 H -1,2,3-triazole. The isotypic series of compounds are real polymorphs as they have identical constitution. The 2-dimensional MOF is formed at lower temperatures whereas formation of the 3-dimensional MOF requires higher temperatures, in some cases solvothermal reaction conditions. We therefore address them as low-temperature α -form and high-temperature β -form. The thermodynamically stable β -form exhibits high thermal stabilities regarding compounds that contain three neighboring nitrogen atoms in one organic ring, ranging up to 380 °C. Transition from α to β -form is accompanied by transformation from open to dense frameworks as only the α -form contains structural voids. This goes along with both an increase of dimensionality of the linkage from 2D to 3D and an increase of the density of the structures. The α -form adopts the AlCl 3 structure, the β -form can be identified with a (10,3)-b net. Although no single crystals could be obtained for β - 3 ∞ [Ln( Tz* ) 3 ], structure solution and reasonable refinement were successful from X-ray powder data. The crystal structure of α - 2 ∞ [Ln( Tz* ) 3 ] was previously solved from single crystal data.
    Type of Medium: Online Resource
    ISSN: 2196-7105 , 2194-4946
    URL: Article
    DOI: 10.1524/zkri.2010.1242
    RVK:
    VA 8180
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2010
    SSG: 13
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  • 2
    Online Resource
    Online Resource
    3D-[Pr(Im) 3 (ImH)]@ImH: Ein dreidimensionales Netzwerk mit vollständiger Stickstoffkoordination aus einer Imidazolschmelze / 3D-[Pr(Im) 3 (ImH)]@ImH: A Three-Dimensional Network with Complete Nitrogen Coordination Obtained from an Imidazole Melt
    Walter de Gruyter GmbH ; 2006
    In:  Zeitschrift für Naturforschung B Vol. 61, No. 7 ( 2006-7-1), p. 792-798
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 61, No. 7 ( 2006-7-1), p. 792-798
    Abstract: The reaction of a melt of unsubstituted imidazole with praseodymium metal yields bright green crystals of 3D-[Pr(Im) 3 (ImH)]@ImH. Imidazolate ligands coordinate η 1 via both N atoms their 1,3 positioning within the heterocycle being responsible for the connection of praseodymium atoms. A 3-dimensional network is formed with imidazole molecules from the melt intercalated in the crystal structure. The imidazole molecules can be released and temperature dependent reversibly be exchanged with gas molecules including argon. Thus the solvent free high temperature synthesis of rare earth elements with amine melts can also be utilized for “crystal engineering” and the synthesis of compounds with material science aspects. Furthermore 3D-[Pr(Im) 3 (ImH)]@ImH is the first unsubstituted imidazolate of the lanthanides.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2006-0704
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2006
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 3
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    Online Resource
    The 1-N amides 1 ∞ [Eu 2 ( Pyr ) 4 ( Pyr H) 2 (NH 3 )] · Pyr H and [Yb 2 ( Cbz ) 4 (NH 2 ) 2 (NH 3 ) 4 ] · 3 Cbz H: Distinctions in the crystal structures, thermal properties and ammonolysis tendency
    Walter de Gruyter GmbH ; 2005
    In:  Zeitschrift für Kristallographie - Crystalline Materials Vol. 220, No. 2-3 ( 2005-3-1), p. 158-165
    Details
    In: Zeitschrift für Kristallographie - Crystalline Materials, Walter de Gruyter GmbH, Vol. 220, No. 2-3 ( 2005-3-1), p. 158-165
    Abstract: The low-temperature oxidation of the rare earth metals europium and ytterbium with the 1-N amines pyrrole and carbazole in liquid ammonia gave the pyrrolate 1 ∞ [Eu 2 ( Pyr ) 4 ( Pyr H) 2 (NH 3 )] · Pyr H (1) ( Pyr – = C 4 H 4 N – , pyrrolate anion; Pyr H = C 4 H 4 NH, pyrrole) and the carbazolate [Yb 2 ( Cbz ) 4 (NH 2 ) 2 (NH 3 ) 4 ] · 3 Cbz H (2) ( Cbz – = C 12 H 8 N – , carbazolate; Cbz H = C 12 H 8 NH), respectively. Though both compounds are ammine complexes, the course through the redox potentials E Ln(II/III) as well as the growing steric demand of the ligand result in various differences in the properties of the products. 1 shows a 1-dimensional structure of pyrrolate, pyrrole groups and one equivalent of ammonia coordinating and bridging divalent europium centers. This includes η 5 – π -interactions between the metal centers and pyrrolate and pyrrole rings. The resulting polymer shows a rather high thermal stability and melts at 445 °C prior to decomposition under release of ammonia at 475 °C. Contrary to this, 2 contains dimeric units around trivalent ytterbium consisting of carbazolate, ammonia and NH – 2 amide groups. No π -interactions are observed. Instead ammonolysis of liquid ammonia results in formation of an amide that contains two different amide groups. The thermal stability of 2 is lower than of 1 . The building units of complex 2 decompose at 310 °C without melting. Both compounds were investigated by low-temperature single crystal X-ray analysis, Mid IR, Far IR and Raman spectroscopy as well as simultaneous DTA/TG.
    Type of Medium: Online Resource
    ISSN: 2196-7105 , 2194-4946
    URL: Article
    DOI: 10.1524/zkri.220.2.158.59117
    RVK:
    VA 8180
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2005
    SSG: 13
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  • 4
    Online Resource
    Online Resource
    1,3-Thiazole as Suitable Antenna Ligand for Lanthanide Photoluminescence in [LnCl 3 (thz) 4 ]·0.5thz, Ln = Sm, Eu, Gd, Tb, Dy
    Walter de Gruyter GmbH ; 2014
    In:  Zeitschrift für Naturforschung B Vol. 69, No. 2 ( 2014-2-1), p. 255-262
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 69, No. 2 ( 2014-2-1), p. 255-262
    Abstract: 1,3-Thiazole as Suitable Antenna Ligand for Lanthanide Photoluminescence in [LnCl 3 (thz) 4 ]·0.5thz, Ln = Sm, Eu, Gd, Tb, Dy
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.5560/znb.2014-3292
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2014
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 5
    Online Resource
    Online Resource
    Structural diversity of salts of terpyridine derivatives with europium(III) located in both, cation and anion, in comparison to molecular complexes
    Walter de Gruyter GmbH ; 2020
    In:  Zeitschrift für Kristallographie - Crystalline Materials Vol. 235, No. 8-9 ( 2020-09-25), p. 353-363
    Details
    In: Zeitschrift für Kristallographie - Crystalline Materials, Walter de Gruyter GmbH, Vol. 235, No. 8-9 ( 2020-09-25), p. 353-363
    Abstract: Three salts of the common composition [EuCl 2 ( X -tpy) 2 ][EuCl 4 ( X -tpy)]·nMeCN were obtained from EuCl 3 ·6H 2 O and the respective organic ligands ( X -tpy = 4′-phenyl-2,2′:6′,2″-terpyridine ptpy, 4′-(pyridin-4-yl)-2,2′:6′,2″-terpyridine 4-pytpy, and 4′-(pyridin-3-yl)-2,2′:6′,2″-terpyridine 3-pytpy). These ionic complexes are examples of salts, in which both cation and anion contain Eu 3+ with the same organic ligands and chlorine atoms coordinated. As side reaction, acetonitrile transforms into acetamide resulting in the crystallization of the complex [EuCl 3 (ptpy)(acetamide)] ( 4 ). Salts [EuCl 2 (ptpy) 2 ][EuCl 4 (ptpy)]·2.34MeCN ( 1 ), [EuCl 2 (4-pytpy) 2 ][EuCl 4 (4-pytpy)]·0.11MeCN ( 2 ), and [EuCl 2 (3-pytpy) 2 ][EuCl 4 (3-pytpy)]·MeCN ( 3 ) crystallize in different structures (varying in space group and crystal packing) due to variation of the rear atom of the ligand to a coordinative site. Additionally, we show and compare structural variability through the dimeric complexes [Eu 2 Cl 6 (ptpy) 2 ( N , N ′-spacer)]· N , N ′-spacer ( 5 , 6 , 7 ) obtained from [EuCl 3 (ptpy)(py)] by exchanging the end-on ligand pyridine with several bipyridines (4,4′-bipyridine bipy, 1,2-bis(4-pyridyl)ethane bpa, and 1,2-bis(2-pyridyl)ethylene bpe). In addition, photophysical (photoluminescence) and thermal properties are presented.
    Type of Medium: Online Resource
    ISSN: 2196-7105 , 2194-4946
    URL: Article
    DOI: 10.1515/zkri-2020-0053
    RVK:
    VA 8180
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    SSG: 13
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  • 6
    Online Resource
    Online Resource
    Divalent Europium in 1 ∞ [Eu(Pz) 2 (Pz-H) 2 ]: The First Unsubstituted Pyrazolate and Cp Analogous Pyrazole Complex of a Rare Earth Element in One
    Walter de Gruyter GmbH ; 2004
    In:  Zeitschrift für Naturforschung B Vol. 59, No. 5 ( 2004-5-1), p. 562-566
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 59, No. 5 ( 2004-5-1), p. 562-566
    Abstract: Bright yellow crystals of 1 ∞ [Eu(Pz) 2 (Pz-H) 2 ] were obtained by the reaction of europium metal with a melt of pyrazole. According to single crystal X-ray analysis the compound exhibits a onedimensional chain structure including both unsubstituted pyrazolate anions as well as unsubstituted neutral pyrazole molecules as ligands. The latter are isoelectronic with the cyclopentadienyl anion and link two adjacent Europium(II) centers in an η 1 -σ -bridging as well as Cp analogous η 5 -π-binding mode, whilst the pyrazolate anions are N-η 1 -coordinating terminal ligands. In addition to the crystal structure, MIR, FarIR, Raman and UV/vis spectroscopic data are presented.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2004-0514
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2004
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
    Location Call Number Limitation Availability
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