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Multitopic metal-organic carboxylates available as supramolecular building units

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COORDINATION CHEMISTRY REVIEWS
卷 474, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2022.214850

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Carboxylate; Metal complexes; Multinuclear structures; Supramolecular structures; Water-soluble materials

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Organic polycarboxylates are important building units in supramolecular chemistry for constructing coordination and hydrogen-bonded frameworks. This review focuses on multifunctional metal-organic carboxylates (MOCs) with multiple noncoordinating carboxylate groups, which can be used as pre-prepared metalloligands for constructing metal-organic frameworks. The stability and diverse structures of MOCs make them promising candidates for various applications.
Organic polycarboxylates that exhibit high designability and stability are fundamental building units for constructing coordination and hydrogen-bonded frameworks in supramolecular chemistry. Recently, dis-crete metal complexes with noncoordinating carboxy moieties (Metal-Organic Carboxylates or Metal -Organic Carboxylic acids; MOCs) have attracted increasing attention as alternatives to organic carboxy-lates because of their simple synthetic procedures and structural diversity, as well as the ease of installing transition metal centers to provide molecular functionalities. This review provides an overview of mul-titopic MOCs with six or more noncoordinating carboxy groups, which are constructed via coordination of organic ligands with carboxylates to appropriate metal ions. The MOCs are classified by the type of donating elements present in the organic ligands employed, and their synthetic approaches and molec-ular and supramolecular structures are described. Of more than 100 multitopic MOCs described herein, 27 MOCs were used as the pre-prepared metalloligand for constructing metal-organic frameworks or coordination polymers. Such MOCs are stable in solution due to the chelate effect of the ligand motifs or the large ligand field stabilization energy of specific metal ions. Moreover, due to their high hydrophilicity, multitopic MOCs are available for biological applications and adsorption of hydrophilic molecules.(c) 2022 Elsevier B.V. All rights reserved.

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