1,10-Phenanthroline-2,9-dicarboxylic Acid Diamides: Synthesis, Structure, and Solubility

A wide range of 1,10-phenanthroline-2,9-dicarboxylic acid diamides was synthesized, differing in the structure of substituents in the amide function and in the nature of substituents at positions 4 and 7 of the heteroaromatic ring. All new compounds were characterized by NMR, IR spectroscopy, and high resolution mass spectrometry. The molecular structure of one of the ligands was unambiguously confirmed by X-ray diffraction analysis. The solubility of all the obtained compounds in 3-nitrobenzotrifluoride was quantitatively evaluated.