Two new metal coordination complexes, namely, poly[aqua(μ₆‐benzene‐1,2,4,5‐tetracarboxylic acid‐κ⁸O¹:O¹,O²:O^2′:O⁴:O⁴,O⁵:O^5′)(μ‐but‐2‐enedioato‐κ²O¹:O⁴)potassium(I)], [K₂(C₄H₂O₄)(C₁₀H₆O₈)(H₂O)₂]_n or [K₂(fum)(H₄btec)(H₂O)₂]_n, (1), and poly[aqua(μ₈‐2,5‐dicarboxybenzene‐1,4‐dicarboxylato‐κ¹²O¹:O^1′,O²:O²,O^2′:O^2′:O⁴:O^4′,O⁵:O⁵,O^5′:O^5′)(μ‐ethanedioato‐κ⁴O¹,O²:O^1′,O^2′)strontium(II)], [Sr₂(C₂O₄)(C₁₀H₄O₈)(H₂O)₂]_n or [Sr₂(ox)(H₂btec)(H₂O)₂]_n, (2) (H₄btec = benzene‐1,2,4,5‐tetracarboxylic acid, H₂btec = 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 H₄btec, fumaric acid (H₂fum) and oxalic acid (H₂ox). 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 {3⁶.4⁶.5³} topology. Complex (2) displays a three‐dimensional (3D) network structure, in which the Sr²⁺ ion is in a distorted monocapped square antiprism geometry. The framework possess a binodal (5,8)‐connected net with the Schläfli symbol {3².4¹⁰.5⁸.6⁴.7⁴}{3².4⁶.5²}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.

中文翻译：

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由苯1,2,4,5-四羧酸和柔性二羧酸配体构成的碱金属和碱土金属配位聚合物：合成，结构以及光谱和热学性质

两个新的金属配位配合物，即，聚[AQUA（μ ₆ -苯-1,2,4,5-四羧酸-κ ⁸ ø ¹：Ò ¹，Ò ²：Ö ^2' ：ø ⁴：Ò ⁴，ö ⁵：ø ^5' ）（μ-丁-2- enedioato-κ ² ø ¹：Ò ⁴）钾（I）]，[K ₂（C ₄ H ^ ₂ ö ₄）（C ₁₀ H ^ ₆ ö ₈）（H ₂ O）₂ ] _Ñ或[K ₂（FUM）（H ₄ BTEC）（H ₂ O）₂ ] _Ñ，（1），和聚[AQUA（μ ₈ -2,5-二羧基-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‐ethyldioato‐κ ⁴O ¹，O ²：O ^1'，O ^2'锶（II）]，[Sr ₂（C ₂ O ₄）（C ₁₀ H ₄ O ₈）（H ₂ O）₂ ] _n或[Sr ₂（ ox）（H ₂ btec）（H ₂ O）₂ ] _n，（2）（H ₄ btec =苯-1,2,4,5-四羧酸，H ₂在水热条件下，通过使不同的碱金属和碱土金属盐与H ₄ btec，富马酸（H ₂ fum）反应，获得了btec = 2,5-二羧基苯-1,4-二羧酸盐（烟熏=富马酸酯和ox =草酸酯）。）和草酸（H ₂ ox）。配合物（1）和（2）在结构上通过单晶X射线衍射，IR和UV-Vis光谱，粉末X射线衍射（PXRD）和热重分析-差示扫描量热法（TGA-DSC）进行表征。络合物（1）显示具有扭曲的五边形双锥体几何结构的带有K ⁺离子的二维（2D）层，并显示出具有{3 ⁶ .4 ⁶ .5的单节点6连通hxl / Shubnikov平面网（3,6）。³拓扑。配合物（2）显示三维（3D）网络结构，其中Sr ²⁺离子呈扭曲的单峰方形反棱镜几何形状。该框架具有一个用Schläfli符号{3 ² .4 ¹⁰ .5 ⁸ .6 ⁴ .7 ⁴ } {3 ² .4 ⁶ .5 ² } ₂连接的双脚（5,8）连接的网络。3D Hirshfeld表面和2D指纹图表明，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的温度范围内的热分解表明它们都以三个步骤分解并转变为相应的金属氧化物。