Abstract By introducing alkaline-earth metal ions (Mg2+, Ca2+, and Sr2+) as structure-directing agents, three new heterometallic complexes, Mg(H2O)6·[Cu2Mg(L)4(H2O)4]·4H2O (1), [CuCa(L)2(H2O)4]n (2) and [CuSr(L)2(H2O)4]n (3) [H2L = 4-(3-(pyridine-4-yl)-1H-1,2,4-triazol-5-yl)picolinic acid], have been synthesized under hydrothermal conditions and structurally characterized. H2L was in situ generated from hydrolysis of the well-known selective xanthine oxidase inhibitor topiroxostat. Complex 1 crystallizes in the space group P21/c and exhibits a zero-dimensional (0-D) structure containing the discrete [Mg(H2O)6]2+ cationic and [Cu2Mg(L)4(H2O)4]2– dianionic moieties. Complexes 2 and 3 are isostructural and crystallize in the space group C2/c, with one-dimensional (1-D) polymeric structure with infinite Cu(II)–Ca/Sr–carboxylate chains. The results reveal the significant influence of the alkaline-earth metal ions on the molecular structure. Their spectroscopic, thermal and solid-state luminescent properties have also been investigated. Graphical Abstract

中文翻译：

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异金属 Cu(II)-M(II)（M = Mg、Ca 和 Sr）与由 topiroxostat 生成的 N,O-供体配体的原位配合物

摘要 通过引入碱土金属离子（Mg2+、Ca2+ 和 Sr2+）作为结构导向剂，三种新的异金属配合物 Mg(H2O)6·[Cu2Mg(L)4(H2O)4]·4H2O (1)， [CuCa(L)2(H2O)4]n (2) 和 [CuSr(L)2(H2O)4]n (3) [H2L = 4-(3-(pyridine-4-yl)-1H-1) ,2,4-三唑-5-基）吡啶甲酸]，已在水热条件下合成并进行结构表征。H2L 是由众所周知的选择性黄嘌呤氧化酶抑制剂托吡唑啉的水解原位生成的。配合物 1 在空间群 P21/c 中结晶并表现出零维 (0-D) 结构，其中包含离散的 [Mg(H2O)6]2+ 阳离子和 [Cu2Mg(L)4(H2O)4]2– 双阴离子部分。配合物 2 和 3 是同构的并在空间群 C2/c 中结晶，具有一维 (1-D) 聚合物结构，具有无限的 Cu(II)-Ca/Sr-羧酸链。结果揭示了碱土金属离子对分子结构的显着影响。还研究了它们的光谱、热和固态发光特性。图形概要