Tetrahydro-1,10-dioxo-4,7-phenanthroline-3,8-dicarboxylic esters exist in the oxo-hydroxy form with a strong intramolecular O–H ⋯ O hydrogen bond; an even stronger intermolecular bond is present in the corresponding carboxylic acids which gives rise to D-type bands in the i.r. spectrum.
D. Smith, P. J. Taylor, J. Vause and W. S. Waring, J. Chem. Soc., Chem. Commun., 1978, 369 DOI: 10.1039/C39780000369
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