作者
Said Lifa,Chahrazed Trifa,Sofiane Bouacida,Chaouki Boudaren,Hocine Mérazig
摘要
Two new metal coordination complexes, namely, poly[aqua(μ 6 -benzene-1,2,4,5-tetracarboxylic acid-κ 8 O 1 : O 1 , O 2 : O 2′ : O 4 : O 4 , O 5 : O 5′ )(μ-but-2-enedioato-κ 2 O 1 : O 4 )potassium(I)], [K 2 (C 4 H 2 O 4 )(C 10 H 6 O 8 )(H 2 O) 2 ] n or [K 2 (fum)(H 4 btec)(H 2 O) 2 ] n , (1), and poly[aqua(μ 8 -2,5-dicarboxybenzene-1,4-dicarboxylato-κ 12 O 1 : O 1′ , O 2 : O 2 , O 2′ : O 2′ : O 4 : O 4′ , O 5 : O 5 , O 5′ : O 5′ )(μ-ethanedioato-κ 4 O 1 , O 2 : O 1′ , O 2′ )strontium(II)], [Sr 2 (C 2 O 4 )(C 10 H 4 O 8 )(H 2 O) 2 ] n or [Sr 2 (ox)(H 2 btec)(H 2 O) 2 ] n , (2) (H 4 btec = benzene-1,2,4,5-tetracarboxylic acid, H 2 btec = 2,5-dicarboxybenzene-1,4-dicarboxylate, fum = fumarate and ox = oxalate), have been obtained under hydrothermal conditions by reacting the different alkali and alkaline earth metal salts with H 4 btec, fumaric acid (H 2 fum) and oxalic acid (H 2 ox). Complexes (1) and (2) were structurally characterized by single-crystal X-ray diffraction, IR and UV–Vis spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetic analysis–differential scanning calorimetry (TGA–DSC). Complex (1) displays a two-dimensional (2D) layer with the K + ion in a distorted pentagonal bipyramidal geometry and exhibits a uninodal 6-connected hxl/Shubnikov plane net (3,6) with {3 6 .4 6 .5 3 } topology. Complex (2) displays a three-dimensional (3D) network structure, in which the Sr 2+ ion is in a distorted monocapped square antiprism geometry. The framework possess a binodal (5,8)-connected net with the Schläfli symbol {3 2 .4 10 .5 8 .6 4 .7 4 }{3 2 .4 6 .5 2 } 2 . The 3D Hirshfeld surfaces and 2D fingerprint plots show that the main interactions are the O...H/H...O intermolecular interactions. Moreover, the thermal decompositions of (1) and (2) in the temperature range 303–1273 K revealed that they both decompose in three steps and transform to the corresponding metal oxide.