5-Methyl-5-aryldipyrromethanes: synthesis, crystal structure and anion binding studies
摘要:
The eco-friendly and selective syntheses of 5-methyl-5-aryldipyrromethanes (1-4) in which aryl is FC6H4 1, ClC6H5 2, CH3OC6H5 3 and CH3C6H5 4, have been reported in the presence of citric acid (weak organic acid) and characterised by IR, H-1 NMR, C-13 NMR and mass spectroscopy. The structures of 2-4 have been confirmed by X-ray crystallography. Anion binding studies of 1-4 with different anions (e.g. F-, Cl-, CH3COO-, and ) have been carried out by H-1 NMR titrations and binding constants have been evaluated using EQNMR program, revealing that they bind fluoride selectively compared with other anions with 1:1 stoichiometry in CDCl3. The binding affinities of these compounds are influenced by the nature of the substituent on the meso-carbon atom.
The eco-friendly and selective syntheses of 5-methyl-5-aryldipyrromethanes (1-4) in which aryl is FC6H4 1, ClC6H5 2, CH3OC6H5 3 and CH3C6H5 4, have been reported in the presence of citric acid (weak organic acid) and characterised by IR, H-1 NMR, C-13 NMR and mass spectroscopy. The structures of 2-4 have been confirmed by X-ray crystallography. Anion binding studies of 1-4 with different anions (e.g. F-, Cl-, CH3COO-, and ) have been carried out by H-1 NMR titrations and binding constants have been evaluated using EQNMR program, revealing that they bind fluoride selectively compared with other anions with 1:1 stoichiometry in CDCl3. The binding affinities of these compounds are influenced by the nature of the substituent on the meso-carbon atom.