Abstract
Three new supramolecular coordination polymers, namely [Zn(1,3-BDC)(HL)]n (Polymer 1), [Zn3(1,3,5-BTC)2(HL)2(H2O)2]n (Polymer 2), and [Zn9(5-SO3-1,3-BDC)2(L)8(OH)4]n (Polymer 3), were synthesized under solvothermal conditions, based on 1H-pyrazolo[3,4-b]pyridin-3-amine (HL) along with 1,3-benzenedicarboxylate (1,3-BDC) and its derivatives, such as 1,3,5-benzenetricarboxylate (1,3,5-BTC) and 5-sulfo-1,3-benzenedicarboxylate (5-SO3-1,3-BDC). Polymers 1–3 were characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD), and single crystal X-ray diffraction analysis. Polymer 1 exhibited a two-dimensional (2D) 4-connected sql net. The neighboring 2D nets were further linked into a 3D supramolecular network by hydrogen-bonding interactions. Polymer 2 displayed a 3D (4, 4, 4)-connected network, which was further stabilized by (14) and S(9) hydrogen-bonding rings along with π–π interactions. The 2D sheet structure of Polymer 3 was constructed by novel quasi-linear nonanuclear Zn(II) units, which further extended into a 3D supramolecular structure by hydrogen-bonding interactions. The solid-state photoluminescence properties of Polymers 1–3 were also investigated.
Highlights
IntroductionCrystal engineering, based on coordination polymers, is one of the most popular research fields, because supramolecular coordination polymers possessing covalent and noncovalent interactions (such as hydrogen-bonding interactions and π···π-stacking interactions) have the advantages of both coordination polymers and supramolecular materials
Crystal engineering, based on coordination polymers, is one of the most popular research fields, because supramolecular coordination polymers possessing covalent and noncovalent interactions have the advantages of both coordination polymers and supramolecular materials
Aromatic acid ligands and N-heterocyclic ligands are the best choice among many ligands, because carboxylic acid ligands and N-heterocyclic ligands have a variety of coordination models; they can perform hydrogen bonding and aromatic π–π stacking in the construction of polymers, which are superior conditions for the synthesis of supramolecular coordination polymers [11,12,13]
Summary
Crystal engineering, based on coordination polymers, is one of the most popular research fields, because supramolecular coordination polymers possessing covalent and noncovalent interactions (such as hydrogen-bonding interactions and π···π-stacking interactions) have the advantages of both coordination polymers and supramolecular materials. 1H-pyrazolo[3,4-b]pyridin-3-amine as a co-ligand to synthesize supramolecular coordination. 1H-pyrazolo[3,4-b]pyridin-3-amine as a co-ligand to synthesize supramolecular coordination polymers. On various the other hand, d10-containing polymers haveofobtained muchgeometries, attention due to to their coordination numbers,coordination which can form a variety coordination such their various coordination numbers, which can form a They variety coordination geometries, such as as tetrahedral, trigonal bipyramidal, and octahedral. To further understand the supramolecular coordination chemistry of rigidity in multidentate carboxylic acids and multidentate N-containing ligands in a reaction with Zn ion, three new Zn(II).
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