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 - Research portal of Justus Liebig University Giessen:

Journal article

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

Authors list: Rybak, JC; Tegel, M; Johrendt, D; Müller-Buschbaum, K

Publication year: 2010

Pages: 187-194

Journal: Zeitschrift für Kristallographie. Crystalline Materials

Volume number: 225

Issue number: 5

ISSN: 2194-4946

DOI Link: https://doi.org/10.1524/zkri.2010.1242

Publisher: De Gruyter Brill

Abstract:
Homoleptic MOF structures of the formulas 2∞[Ln(Tz*)3] and 3∞[Ln(Tz*)3], (Tz*)– = 1,2,3-triazolate anion, C2H2N3–, Ln = Gd-Lu, were obtained by the reaction of the lanthanide metals with the aromatic heterocyclic amine 1H-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 AlCl3 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.

Authors/Editors

- Uni.-Prof. Dr. Klaus Müller-Buschbaum

Citation Styles

Harvard Citation style: Rybak, J., Tegel, M., Johrendt, D. and Müller-Buschbaum, K. (2010) 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, Zeitschrift für Kristallographie. Crystalline Materials, 225(5), pp. 187-194. https://doi.org/10.1524/zkri.2010.1242

APA Citation style: Rybak, J., Tegel, M., Johrendt, D., & Müller-Buschbaum, K. (2010). 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. Zeitschrift für Kristallographie. Crystalline Materials. 225(5), 187-194. https://doi.org/10.1524/zkri.2010.1242