Yarwood, Jack published the artcileVibrational band shape and intensity studies on molecular motions and interactions in condensed phases. Part 3. Effects of complexation on the molecular dynamics of pyridine, Quality Control of 6443-90-9, the publication is Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics (1976), 72(5), 967-74, database is CAplus.
The changes in ir band width of pyridine on complexation with ICl are consistent with a mechanism involving a large increase in the total correlation time, due to removal of a large part of the correlation function GR(t), and a subsequent broadening of the band due to increased vibrational relaxation. This relaxation is partly controlled by dipole-dipole interaction and partly by transition dipole-transition dipole interaction. The vibrational relaxation mechanism operates for free pyridine and on complexation produces a pattern of band widths dependent on the intensities, normal coordinates, and symmetry properties of the normal modes.
Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics published new progress about 6443-90-9. 6443-90-9 belongs to iodides-buliding-blocks, auxiliary class Pyridines, name is Pyridine Iodochloride complex, and the molecular formula is C11H10ClNO, Quality Control of 6443-90-9.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com