Potassium Complexes of Quercetin-5′-Sulfonic Acid and Neutral O-Donor Ligands: Synthesis, Crystal Structure, Thermal Analysis, Spectroscopic Characterization and Physicochemical Properties
| Autor: | Ewaryst Mendyk, Daniel Kamiński, Anna E. Koziol, Urszula Maciołek, Małgorzata Kosińska-Pezda |
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| Rok vydání: | 2021 |
| Předmět: |
crystal structure
Technology Potassium spectroscopic studies chemistry.chemical_element quercetin-5′-sulfonic acid Article chemistry.chemical_compound Polymer chemistry polymeric potassium complexes acetone solvate DMSO solvate thermal analysis solubility Acetone Molecule General Materials Science Solubility Carbonyl sulfide Microscopy QC120-168.85 Aqueous solution Ligand QH201-278.5 Engineering (General). Civil engineering (General) TK1-9971 Descriptive and experimental mechanics chemistry Electrical engineering. Electronics. Nuclear engineering TA1-2040 Carbon monoxide |
| Zdroj: | Materials, Vol 14, Iss 6798, p 6798 (2021) Materials; Volume 14; Issue 22; Pages: 6798 Materials |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14226798 |
| Popis: | The coordination ability of QSA− ligand towards potassium cations was investigated. Potassium complex of quercetin-5’-sulfonate of the general formula [KQSA(H2O)2]n was obtained. The [KQSA(H2O)2] (1) was a starting compound for solvothermal syntheses of acetone (2) and dimethylsulfoxide (3) complexes. For the crystalline complexes 1–3, crystals morphology was analyzed, IR and Raman spectra were registered, as well as thermal analysis for 1 was performed. Moreover, for 1 and 3, molecular structures were established. The potassium cations are coordinated by eight oxygen atoms (KO8) of a different chemical nature; coordinating groups are sulfonic, hydroxyl, and carbonyl of the QSA− anion, and neutral molecules—water (1) or DMSO (3). The detailed thermal studies of 1 confirmed that water molecules were strongly bonded in the complex structure. Moreover, it was stated that decomposition processes depended on the atmosphere used above 260 °C. The TG–FTIR–MS technique allowed the identification of gaseous products evolving during oxidative decomposition and pyrolysis of the analyzed compound: water vapor, carbon dioxide, sulfur dioxide, carbonyl sulfide, and carbon monoxide. The solubility studies showed that 1 is less soluble in ethanol than quercetin dihydrate in ethanol, acetone, and DMSO. The exception was aqueous solution, in which the complex exhibited significantly enhanced solubility compared to quercetin. Moreover, the great solubility of 1 in DMSO explained the ease of ligand exchange (water for DMSO) in [KQSA(H2O)2]. |
| Databáze: | OpenAIRE |
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