Formation of uranyl phthalate coordination polymers with unusual 2D net topologies in the presence of organic cations. Issue 48 (19th November 2020)

• Record Type: Journal Article
• Authors: Andreev, Grigory; Budantseva, Nina; Levtsova, Anastasiya; Sokolova, Marina; Fedoseev, Aleksander
• Is Part Of: CrystEngComm. Volume 22:Issue 48(2020)
• Page Start: 8394
• Page End: 8404
• Publication Date: 2020-11-19
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce01323d
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Inclusion of heterocyclic cations into a uranyl-phthalate system allowed the formation of 2D coordination polymers whose topological analysis revealed that the underlying nets had unusual topologies. Abstract : New uranyl coordination polymers have been synthesized in the presence of organic cations using phthalic acid as a linker. X-ray analysis of single crystals has shown that compounds with protonated imidazole, and 2-methylimidazole exhibit 2D layered structures. The complex (HIm)2 [(UO2 )3 {C6 H4 (COO)2 }4 ]·2H2 O contains two crystallographically unique uranium atoms in penta- and hexagonal bipyramidal environments. As a result of the bridging function of the phthalate ions, infinite layers were formed. The stacking of the layers results in the formation of square channels which were filled with HIm cations. In the structure of (HMeIm)4 [(UO2 )7 {C6 H4 (COO)2 }8 (OH)2 ], four crystallographically unique uranium atoms were found both in the 6- and 7-fold coordination environments. Both phthalate- and hydroxyl-ions act as bridging ligands resulting in the 2D structure. Organic cations are located between the layers. Both layered complexes exhibit unusual net topologies. In addition, a series of tetranuclear complexes were obtained that are described by the formula A4 [(UO2 )4 (μ3 -O)2 {C6 H4 (COO)2 }4]· n H2 O (where A = t -BuNH3, C2 H5 NH3, As(C6 H5 )4 ). All complexes are characterized by IR, UV-vis, and luminescence spectroscopy. Thermal analysis of the compounds was conducted.