4-(3-Carboxyphenyl)picolinic acid (H₂cppa) was applied as a new and virtually unexplored building block for the synthesis of eleven new coordination compounds, namely [M(Hcppa)₂(H₂O)₂]·2H₂O {M = Ni (1) and Zn (2)}, [M(μ₃-cppa)(H₂O)₂]_n {M = Ni (3) and Co (4)}, {[Co(μ-cppa)(2,2′-bipy)(H₂O)]·H₂O}_n (5), [Zn(μ-cppa)(2,2′-bipy)]_n (6), [M(μ-cppa)(phen)(H₂O)]_n {M = Co (7), Zn (8), Mn (9), and Cu (10)}, and {[Cd₃(μ₃-cppa)₃(phen)₂]·4H₂O}_n (11). All these compounds were generated by a hydrothermal self-assembly method using the corresponding metal(II) chlorides, H₂cppa, and two types of N-donor ancillary ligands, selected from 2,2′-bipyridine (2,2′-bipy) or 1,10-phenanthroline (phen). The obtained products 1–11 were characterized by standard methods, including IR spectroscopy, elemental and thermogravimetric analyses, and powder and single-crystal X-ray diffraction. They represent the first structurally characterized compounds derived from H₂cppa. The structures of 1–11 vary from a complex 3D metal–organic framework (MOF) 11 to 2D coordination polymers 3 and 4, 1D coordination polymers 5–10, and discrete 0D monomers 1 and 2. Such a structural diversity is guided by the nature of the metal(II) node, level of deprotonation of 4-(3-carboxyphenyl)picolinic acid, and type of applied ancillary ligand. In addition, the structures of 1, 2, 5, and 7–10 are further extended [0D → 3D (1 and 2), 1D → 2D (5), and 1D → 3D (7–10)] into various H-bonded supramolecular networks. Both the supramolecular (in 1, 2, 5, and 7–10) and metal–organic (in 3, 4, 6, and 11) underlying networks were analyzed and classified from the topological viewpoint, revealing the distinct pcu (in 1 and 2), fes (in 3 and 4), gek1 (in 5), 2C1 (in 6), and srs (in 7–10) topological nets, whereas a topologically unique framework was identified in MOF 11. The magnetic behavior of 3–5, 7, 9, and 10 and luminescence properties of 2, 6, 8, and 11 were also investigated and discussed.

中文翻译：

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探索4-（3-羧基苯基）吡啶甲酸作为半刚性构建基，用于各种金属-有机和超分子网络的水热自组装†

4-（3-羧苯基）吡啶甲酸（H ₂ cppa）被用作合成11种新的配位化合物[M（Hcppa）₂（H ₂ O）₂ ]·2H ₂的新的且几乎未开发的结构单元-O {M =的Ni（1）和Zn（2）}，[M（μ ₃ -cppa）（H ₂ O）₂ ] _ñ {M =镍（3）和Co（4）}，{[CO（μ -cppa）（2,2'-bipy）（H ₂ O）]·H ₂ O} _n（5），[Zn（μ-cppa）（2,2'-bipy）] _n（6），[M （μ-cppa）（苯酚）（H₂ O）] _ñ {M = CO（ 7），锌（ 8），锰（ 9），和Cu（ 10）}，和{[CD ₃（μ ₃ -cppa） ₃（phen）的₂ ]·4H ₂ O} _n（ 11）。所有这些化合物都是通过水热自组装方法使用相应的氯化金属（ II），H ₂ cppa和两种类型的N-供体辅助配体生成的，这些配体选自2,2'-联吡啶（2,2'-bipy ）或1,10-菲咯啉（phen）。获得的产品1-11用标准方法表征，包括红外光谱，元素和热重分析以及粉末和单晶X射线衍射。它们代表了首个衍生自H ₂ cppa的结构特征化合物。的结构1-11从一个复杂的三维金属-有机构架（MOF）变化11至2D配位聚合物3和4，一维配位聚合物5-10和分立0D单体1和2。这种结构的多样性是由金属的性质决定的（II）节点，4-（3-羧苯基）吡啶甲酸去质子化的水平以及所用辅助配体的类型。此外，结构1，2，5，和7至10被进一步扩展[0D→3D（1和2），1D→2D（5），和图1D→3D（7-10）]成各种H-键合的超分子网络。两个超分子（在1，2，5，和7-10）和金属-有机（在3，4，6，和11）底层网络从拓扑角度进行了分析和分类，揭示了不同的pcu（在1和2中），fes（在3和4中），gek1（在5中），2C1（在6中）和srs（在7-10中））拓扑网，而在MOF 11中确定了拓扑唯一的框架。的磁性行为3-5，7，9，和10和发光性质2，6，8和11也进行了调查和讨论。