Synthesis and Structural Characterization of Three New Strontium(II) Coordination Polymers Based on 4-Nitrobenzoate

Parsekar, Neha U.; Bhargao, Pooja H.; Näther, Christian; Bensch, Wolfgang; Srinivasan, Bikshandarkoil R.

doi:10.1007/s10904-021-02097-9

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…The structure of compound 6, [Mg(H 2 O) 6 ][H 3 thba] 2 Á2H 2 O, is markedly different to the structures of the other metal salts described previously in this article as the metal centres are not bonded to the organic anions. Instead, the Mg 2+ ions are present as octahedral Mg(H 2 O) 6 2+ units; this is unsurprising as the Mg(H 2 O) 6 2+ unit is often observed in magnesium compounds (Parsekar et al, 2022), including in the salt of H 2 hba, [Mg(H 2 O) 6 ][Hhba] 2 Á2H 2 O (Shnulin et al, 1981).…”

Section: Figure 10mentioning

confidence: 99%

Complexes of 2,4,6-trihydroxybenzoic acid: effects of intramolecular hydrogen bonding on ligand geometry and metal binding modes

et al. 2022

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This article describes a series of more than 20 new compounds formed by the combination of 2,4,6-trihydroxybenzoic acid (H4thba) with metal ions in the presence of a base, with structures that include discrete molecular units, chains, and two- and three-dimensional networks. As a result of the presence of two ortho-hydroxy groups, H4thba is a relatively strong acid (pK a1 = 1.68). The carboxylate group in H3thba− is therefore considerably less basic than most carboxylates with intramolecular hydrogen bonds, conferring a rigid planar geometry upon the anion. These characteristics of H3thba− significantly impact upon the way it interacts with metal ions. In s-block metal compounds, where the interaction of the metal centres with the carboxylate O atoms is essentially ionic, the anion bonds to up to three metal centres via a variety of binding modes. In cases where the metal ion is able to form directional coordinate bonds, however, the carboxylate group tends to bond in a monodentate mode, interacting with just one metal centre in the syn mode. A dominant influence on the structures of the complexes seems to be the face-to-face stacking of the aromatic rings, which creates networks containing layers of metal–oxygen polyhedra that participate in hydrogen bonding. This investigation was undertaken, in part, by a group of secondary school students as an educational exercise designed to introduce school students to the technique of single-crystal X-ray diffraction and enhance their understanding of primary and secondary bonding.

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Section: Figure 10mentioning

confidence: 99%