Lifa Said, Trifa Chahrazed, Bouacida Sofiane, Boudaren Chaouki, Merazig Hocine
Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale (CHEMS), Université des frères Mentouri Constantine 1, 25000, Algeria.
Acta Crystallogr C Struct Chem. 2021 Feb 1;77(Pt 2):90-99. doi: 10.1107/S2053229621000085. Epub 2021 Jan 14.
Two new metal coordination complexes, namely, poly[aqua(μ-benzene-1,2,4,5-tetracarboxylic acid-κO:O,O:O:O:O,O:O)(μ-but-2-enedioato-κO:O)potassium(I)], [K(CHO)(CHO)(HO)] or [K(fum)(Hbtec)(HO)], (1), and poly[aqua(μ-2,5-dicarboxybenzene-1,4-dicarboxylato-κO:O,O:O,O:O:O:O,O:O,O:O)(μ-ethanedioato-κO,O:O,O)strontium(II)], [Sr(CO)(CHO)(HO)] or [Sr(ox)(Hbtec)(HO)], (2) (Hbtec = benzene-1,2,4,5-tetracarboxylic acid, Hbtec = 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 Hbtec, fumaric acid (Hfum) and oxalic acid (Hox). 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 {3.4.5} topology. Complex (2) displays a three-dimensional (3D) network structure, in which the Sr ion is in a distorted monocapped square antiprism geometry. The framework possess a binodal (5,8)-connected net with the Schläfli symbol {3.4.5.6.7}{3.4.5}. 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.
通过使不同的碱金属和碱土金属盐与苯-1,2,4,5-四羧酸（Hbtec）、富马酸（Hfum）和草酸（Hox）在水热条件下反应，得到了两种新的金属配位络合物，即聚[水合（μ-苯-1,2,4,5-四羧酸根-κO:O,O:O:O:O,O:O）（μ-丁-2-烯二酸根-κO:O）钾（I）]，[K(CHO)(CHO)(HO)]或[K(fum)(Hbtec)(HO)]，（1），以及聚[水合（μ-2,5-二羧基苯-1,4-二羧酸根-κO:O,O:O,O:O:O:O:O:O:O）（μ-乙二酸根-κO,O:O,O）锶（II）]，[Sr(CO)(CHO)(HO)]或[Sr(ox)(Hbtec)(HO)]，（2）（Hbtec = 苯-1,2,4,5-四羧酸，Hbtec = 2,5-二羧基苯-1,4-二羧酸根，fum = 富马酸根，ox = 草酸根）。通过单晶X射线衍射、红外和紫外-可见光谱、粉末X射线衍射（PXRD）以及热重分析-差示扫描量热法（TGA-DSC）对络合物（1）和（2）进行了结构表征。络合物（1）呈现出二维（2D）层结构，其中K离子处于扭曲的五角双锥几何构型，并且展现出具有{3.4.5}拓扑结构的单节点6连接hxl/舒布尼科夫平面网络（3,6）。络合物（2）呈现出三维（3D）网络结构，其中Sr离子处于扭曲的单帽方反棱柱几何构型。该骨架具有一个双节点（5,8）连接网络，其施莱夫利符号为{3.4.5.6.7}{3.4.5}。三维赫希菲尔德表面和二维指纹图谱表明主要相互作用是O...H/H...O分子间相互作用。此外，（1）和（2）在303 - 1273 K温度范围内的热分解表明它们均分三步分解并转化为相应的金属氧化物。
