Abstract

The measurements of ultrasonic velocity and density were made for the ternary mixtures of pyridine and quinoline with indole in a non-polar solvent, benzene at 20 °C, 30 °C and 40 °C in the concentration range of 0.0000–0.0891 and 0.0000–0.0631(in mole fractions of pyridine and quinoline, respectively). The non-linear variation of ultrasonic velocity with concentration indicates the solute–solute interaction through hydrogen bonding. Formation of complexes in these mixtures is further supported by FTIR spectra.

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