The Crystal Structure of a RAS (N–CH 3 -2-NH 2 -5-Cl– Py )(TCNQ)(CH 3 CN) Solvate

The structure of the radical anion salt (RAS) of 7,7,8,8-tetracyanedimethane (TCNQ) with a cation based on 2-amin-5-chloro-pyridine (2-NH 2 -5-Cl– Py , Am), that is, (N–CH 3 -2-NH 2 -5-Cl– Py ) (TCNQ) (CH 3 CN), ( I ) is presented. Unlike most TCNQ RASs, which contain flat TCNQ particle stacks, RAS I contains practically isolated (TCNQ) _2^2 - π-dimers with unusually short distances between the planes in the dimers: 3.24 Å. In the RAS I IR spectra special features are observed that correspond to the vibronic interactions of molecular vibrations.