COORDINATION POLYMER OF CU (II) WITH 5-SULFOSALYSILIC ACID AND MONOETHANOLAMINE: SYNTHESIS, STRUCTURE AND HIRSHFELD SURFACE ANALYSIS
Abstract
A novel coordination polymer (CP) has been synthesized and characterized through a combination of techniques including elemental analysis, Fourier Transform Infrared (FT-IR) spectroscopy, X-ray crystallography, and Hirshfeld surface analysis. The compound, formulated as [Cu2(SSA)4]n(MEA)2(H2O)4, exhibits a distinctive "paddle-wheel" or "Chinese lantern" structural motif. In this structure, copper ions occupy the central axis, while sulphosalicylic acid (SSA) ligands bridge these metal centers, forming a polymeric chain. The SSA molecules coordinate to the copper ions in two distinct ways axial coordination: The oxygen atoms (O10) of the sulfo groups bind to the metal centers. Equatorial coordination: The carboxylate ends of the SSA molecules link neighboring paddle-wheel units, resulting in the formation of polymeric chains extending along the [100] direction. Intramolecular hydrogen bonding (O1-H...O5) is observed within the SSA molecules. A Hirshfeld surface analysis was conducted to gain insights into the intermolecular interactions within the crystal structure. The analysis reveals significant variations in the contributions of different elements to both the internal and external surfaces of the molecule: Hydrogen: Makes substantial contributions to both the internal (31%) and external (59.7%) surfaces. Oxygen: Plays a significant role in the internal surface (49%) but a lesser role in the external surface (29.5%). Carbon: Contributes moderately to the internal surface (15.9%) and minimally to the external surface (6.1%). Copper: Has a minor impact on both internal (4.1%) and external (4%) surfaces.These findings provide valuable information about the packing arrangement and intermolecular interactions within the crystal lattice of the coordination polymer.
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