A series of lanthanide–organic polymers incorporating ethyl-4,5-imidazole-dicarboxylato and formate coligand: structures, luminescent and magnetic properties

Abstract

Four new lanthanide-organic coordination polymers incorporating both nitrogen heterocyclic dicarboxylate and formate coligands, namely, {[Ln 3 (Heimda) 4 (m 2 -HCOO)$4H 2 O]$2H 2 O} n , (Ln ¼ Sm (1), Dy (2), Ho (3), Er (4), H 3 eimda ¼ 1H-2-ethyl-4,5-imidazole-dicarboxylic acid) have been fabricated successfully and characterized systematically. The polymers 1-4 are isomorphous and isostructural, and are built from two dimensional (2-D) double decker networks based on the Ln 4 Heimda 4 tetranuclear basic carboxylate as a secondary building unit (SBU). The extensive hydrogen bonds stabilize the crystal structure, forming a 3-D supramolecular tectonics. The luminescence emission spectra of the polymers vary depending on which lanthanide(III) ion is present. Variable-temperature magnetic susceptibility measurements show that the same end-to-end bridging fashion of formate results in the different magnetic properties occurring between adjacent lanthanide(III) centers.

Series of coordination polymers based on 4-(5-sulfo-quinolin-8-yloxy) phthalate and bipyridinyl coligands: Structure diversity and properties

“…The peaks at ca. 1580 cm À 1 are assigned to the stretching vibrations of benzene ring in sqpa ligand [32][33][34]. The absorption about 1110 cm À 1 indicate that existence of ether groups in substituted ligands [35].…”

A Silver–Organic Frameworks Based on Flexible-Aromatic Dicarboxylate and Bipyridinyl Skeletons Coligand: Crystal Structure and Luminescence Property

“…The broad spectra appearing around 1600 cm -1 and intense peaks appearing at 1447 cm -1 correspond to the asymmetric and symmetric stretching vibrations of the carboxylic group, respectively [27]. The peaks at ca.…”

A novel praseodymium coordination polymer with Pcu topology: Crystal structure, thermal decomposition, luminescence and magnetic properties

“…MOFs offer the potential for extensive topological and functional control through judicious choice of the organic linker. Topology in this case is different from the lanthanide framework with same substituted imidazole ligand [20]. Maybe, the geometry of the ancillary ligand influences the overall topology.…”