Ginn, S. G. W. published the artcileIntermolecular vibrations of charge-transfer complexes, Computed Properties of 6443-90-9, the publication is Transactions of the Faraday Society (1966), 62(4), 777-87, database is CAplus.
The intermol. vibration band was identified in the far-ir spectra of the pyridine-IBr and pyridine-ICl charge-transfer complexes. All the reported observations on these and similar complexes can be accounted for by a simple 3-center mol. orbital treatment.
Transactions of the Faraday Society 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 C5H5ClIN, Computed Properties of 6443-90-9.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com