Supramolecular Organic Frameworks (SOFs) Using Anthracene Based Flexible Azoles: Synthesis, Structural and Photophysical Studies

Abstract

Abstract: A series of salts viz., BIA 2SIA 2CH OH (1a), BTA NDS 2H O (1b), BTA NDS 2H O 2DMF (1c), BBIA 0.5NDS DMF (1d), BBIA 2SIA 2H O (1e) and BPA NDS 2H O (1f) have been synthesised by solvothermal method. All these salts were characterized by elemental analysis, TGA, PXRD and single-crystal X-ray diffraction technique. Structural analysis revealed that these salts showed N–H⋯O, O–H⋯O, C–H⋯O, C–H⋯π and π⋯π interactions. The overall percentage of short contacts and the contribution of the different intermolecular interactions were examined by Hirshfeld surface analysis. The solid-state emission maxima of all salts is blue-shifted in comparison to the pure ligand. This may due to different modes of packing of anthracene moieties and solvent assisted hydrogen bonding in sulfonate salts. Thermal stability of 1d, 1e and 1f salts are more than other salts. Graphic Abstract: Hirshfeld surface analysis employed to identify intermolecular interactions within the structure. The close inspection of Hirshfeld surface analysis of NDS and SIA molecule in all the structures revealed that the maximum area of the Hirshfeld surface are covered by O⋯H/H⋯O hydrogen bond interaction in all salts