Two Novel Benzenedicarboxylate-Metal Complexes: Synthesis, Crystal Structures, and Properties

Abstract

= 3-nitro-1,2-benzenedicarboxylic acid, 2,2 -bpy = 2,2 -bipyridine, 4,4 -bpy = 4,4 -bipyridine), have been synthesized and structurally characterized. Complex 1 is a 0-dimensional (0D) framework, but face-to-face π -π stacking interactions and O-H···O hydrogen bonds extend these molecules into a 3D supramolecular framework. X-ray structure analysis reveals that complexes 2 exhibit a 2-dimensional (2D) network structure. Also, IR spectra, fluorescence properties, thermal decomposition process, and powder X-ray diffraction of the complexes were investigated.Keywords 3-nitro-1, 2-benzenedicarboxylic acid, carboxylate group, X-ray crystal diffraction INTRODUCTIONOver the past two decades, the crystal engineering of coordination complexes (CCs) has provoked unparalleled attention and imagination within coordination chemistry based on assembly of judiciously chosen metal ions (joints) and multifunctional organic ligands (struts). Much effort has been devoted to controlling the structures of CCs because their intriguing properties and potential applications are strongly dependent on their structures. [1] Despite some recent advancement, the ability to predict and control the supramolecular assembly remains a longstanding challenge, and much more elaborate and systematic work is required to comprehend the inter-and intramolecular forces that determine the fashions of molecular structure and crystal packing in the solid state. A better understanding of the influence factors of structure, including inbeing of the metal ions and the predesigned organic ligands [2] as well as other factors such as the medium, [3] the pH value of the solution, [4] the temperature, [5]