The presence of two distinct forms of p-nitroaniline (pNA) associated
with solvent acetonitrile (AN) molecules is shown by using an SVD (Sin
gular Value Decomposition) analysis of the UV-VIS spectra of pNA in AN
/CCl4, mixed solvents. All the three species (including the unassociat
ed form in pure CCl4) observed have varying degrees of intramolecular
charge transfer due to the association.