A Series of Lanthanide−Organic Frameworks Based on 2-Propyl-1H-imidazole-4,5-dicarboxylate and Oxalate: Syntheses, Structures, Luminescence, and Magnetic Properties

• Published in: Crystal growth & design Vol. 10; no. 3; pp. 1399 - 1408
• Main Authors: Feng, Xun, Zhao, Jianshe, Liu, Bin, Wang, Liya, Ng, Seikweng, Zhang, Gai, Wang, Jiange, Shi, Xinge, Liu, Yongyong
• Format: Journal Article
• Language: English
• Published: Washington,DC American Chemical Society 03.03.2010
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic properties and materials; Materials science; Methods of nanofabrication; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Organic compounds; Other ferromagnetic metals and alloys; Physics; Self-assembly; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Studies of specific magnetic materials; Imidazole derivatives; Molecular structure; Polychelate; Dicarboxylic acids; Luminescence; Erbium compounds; Ferromagnetic materials; Pillared structure; Europium additions; Open framework; Rare earths; Holmium; Optical properties; Oxalates; Europium; X-ray diffraction analysis; Erbium; Magnetic properties; Crystal structure; Metal organic framework; Organic polymers; Dysprosium; Self-assembly; Imidazoles; Ligands; Arrays
• ISSN: 1528-7483; 1528-7505
• DOI: 10.1021/cg901391y

A family of self-assembly lanthanide−organic coordination polymers with both rigid and flexible ligands formulated as {[Ln2(Hpimda)2(μ4-C2O4)·2H2O]·4H2O} n (Ln = Sm (1), Eu (2), Tb (3), Dy (4), Ho (5), Er (6), H3pimda = 2-propyl-1H-imidazole-4,5-dicarboxylic acid) has been synthesized from the reactions of H3pimda with trivalent lanthanide salts in the presence of oxalate as coligand. X-ray diffraction analysis reveals that these complexes are isomorphous and isostructural, and each forms a novel three-dimensional (3D) frameworks structure, in which the metalloligands' two-dimensional (2D) networks were constructed from the lanthanide ion, 2-propyl-imidazole-dicarboxylate as well as oxalate ligands, and the oxalate further acts as a pillar to link the [Ln(Pimda)(oxo)] 2D grids to generate the 3D open frameworks, leaving one-dimensional channels, which are occupied by water clusters displaying an intricate array. The luminescence emission spectra of the complexes vary depending on which lanthanide ion is present. In addition, compounds 3, 4, and 5 exhibited weak but significant ferromagnetic couplings within the two adjacent magnetic centers bridged through oxalato, whereas dominant antiferromagnetic interaction was observed in the erbium compound of 6, respectively.