INTERMOLECULAR INTERACTIONS OF PYRIDINE ANALOGS OF PICRIC ACID WITH SOME PYRIDINE BASES

UV VIS spectrophotometric and quantum-mechanical study on the interact ion of 3-hydroxy-2,6-dinitropyridine (3HDNP) and 3-hydroxy-2,4,6-trini tropyridine (3HTNP) with selected pyridine bases is presented. The sta bility constants for complex formation in aqueous solution have been d etermined. Comparisons were made with corresponding complexes of polyn itrophenols. The nature of interactions has been verified with semiemp irical (AM1 and modified INDO) quantum-mechanical methods. It has been found that the values of stability constants for complex formation fo r 3HDNP and 3HTNP with pyridine bases in water are of comparable magni tude to those of picric acid in benzene solution.