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چکیده
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Metal-organic frameworks (MOFs) have been employed in various fields such as catalysts, electrocatalysts, supercapacitors, drug delivery, sensors, batteries, membranes, and absorbents due to the eye-catching features such as various synthesis methods, structural diversity, high surface area, and attractive architectures [1]. Among the large family of metal-organic frameworks (MOFs), Zr-based MOFs much research has been invested to directly construct MOFs with inherent stability in structure and composition [2]. Hydrogen-bonded organic frameworks (HOFs) are novel type of porous crystalline solids assembled by organic or metal-organic building blocks through hydrogen-bonding interactions. The concept for the construction of porous HOF materials using hydrogen bonding interactions was proposed in the early 1990s, almost the same period as that of MOFs. Most of H-bonding interactions are essentially weak, flexible and of low directionality, as compared with covalent and coordinate bonds in terms of bonding energies and angles. Many HOFs thus possess different isomers depending on their synthesis solvents or conditions, which significantly increases the structural diversity of HOFs [3]. The pyrrolo[2,3-b]pyridine core structure, a bioisostere of quinolones, is found in several molecules as biological activity [4]. Herein, we have synthesized new pyrrolo[2,3-b]pyridines in percent of Zr-MOF-UR as hydrogen bond donor catalyst under reflux condition (Scheme 1).
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