Abstract
Three new metal−organic frameworks based on scandium(III) cations and 2,5-thiophenedicarboxylic acid (H2Tdc) are synthesized: [Sc(Tdc)(OH)]·1.2DMF (I), [Sc(Tdc)(OH)]·2/3DMF (II), and (Me2NH2)[Sc3(Tdc)4(OH)2]·DMF (III) (DMF is N,N-dimethylformamide). The structures of the compounds are determined by single-crystal X-ray structure analysis (CIF file CCDC nos. 2067819 (I), 2067820 (II), and 2067821 (III)). The chemical and phase purity of compound I is proved by elemental analysis, thermogravimetry, X-ray diffraction analysis, and IR spectroscopy.
Highlights
Metal−organic frameworks (MOF) represent an already known class of inorganic compounds consisting of metal ions or clusters bound to each other by bridging ligands with the formation of one- (1D), two(2D), or three-dimensional (3D) periodic structures [1,2,3]
Several thousands of diverse MOF are known nowadays, but the high hydrolytic stability is shown only for a restricted scope of systems among which the frameworks based on bridging carboxylate ligands and highly charged cations of oxophilic metals, namely, Sc(III), Cr(III), Al(III), Ti(IV), and Zr(IV), can be distinguished [10,11,12,13,14]
It should be mentioned that the number of the known MOF based on highly charged ions and containing heterocyclic thiophene cycles is low, for example, only two such MOF with the 2,5-thiophenedicarboxylate anions are known for scandium(III) [19, 20]
Summary
Metal−organic frameworks (MOF) represent an already known class of inorganic compounds consisting of metal ions or clusters bound to each other by bridging ligands with the formation of one- (1D), two(2D), or three-dimensional (3D) periodic structures [1,2,3]. These compounds can retain porosity after the removal of guest solvent molecules and can be used as sorbents for the very broad range of applications [4,5,6]. The composition and structure of transparent rhombic crystals of compound III were determined by SCXRD.
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