Abstract
Two new three-dimensional (3D) coordination compounds, namely a lead(II) coordination polymer (CP) {[Pb3(µ5-cpta)(µ6-cpta)(phen)2]·2H2O}n (1) and a zinc(II) metal-organic framework (MOF) {[Zn2(µ4-cpta)(µ-OH)(µ-4,4′-bipy)]·6H2O}n (2), were hydrothermally assembled from 2-(5-carboxypyridin-2-yl)terephthalic acid (H3cpta) as an unexplored principal building block and aromatic N,N-donors as crystallization mediators. Both products were isolated as air-stable microcrystalline solids and were fully characterized by IR spectroscopy, elemental and thermogravimetric analysis, and powder and single-crystal X-ray diffraction. Structural and topological features of CP 1 and MOF 2 were analyzed in detail, allowing to identify a topologically unique 4,5,5,6-connected net in 1 or a very rare 4,4-connected net with the isx topology in 2. Thermal stability and solid-state luminescent behavior of 1 and 2 were also investigated. Apart from revealing a notable topological novelty, both compounds also represent the first structurally characterized Pb(II) and Zn(II) derivatives assembled from H3cpta, thus opening up the application of this unexplored pyridine-tricarboxylate block in the design of new metal-organic architectures.
Highlights
We applied a versatile aqueous medium approach for the synthesis of two novel 3D metal‐organic architectures derived from 2‐(5‐carboxypyridin‐2‐
Hydrothermal synthesis of two novel 3D metal-organic architectures derived from yl)terephthalic acid (H3cpta) as an underexplored tricarboxylate building block with a phenyl‐
The obtained coordination polymer 1 and metal-organic the first structurally characterized Pb(II) and Zn(II) coordination compounds assembled from H3cpta
Summary
The research on metal-organic frameworks (MOFs) has become a very hot topic in materials science, especially given their almost infinite structural diversity [1,2,3] and notable functional properties, with significance in the areas of luminescent materials [4,5,6], molecular magnetism [7,8,9,10], gas storage [11,12,13], sensing and separation [14,15,16], and catalysis [17,18,19,20]. For the design of MOFs, it is interesting to explore different aromatic carboxylic acids as flexible and stable building blocks with modifiable backbones and coordination preferences, along with the metal nodes that can exhibit unusual coordination preferences [27,28,29,30]. Multicarboxylate building blocks are among the most common ones used in the synthesis of MOFs, different aromatic N,N-donors play an important role and frequently act as ancillary ligands. Following our interest in the exploration of novel and poorly investigated multicarboxylic acids for the design of metal-organic architectures [21,22,24,25,26,27], in the present study we selected. The obtained compounds represent the first structurally characterized Pb(II) and Zn(II) derivatives assembled from 2-(5-carboxypyridin-2-yl)terephthalic acid
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