The infrared spectra of the (1:1) charge transfer salt of N, N, N prime , N prime -tetramethyl-p-phenylendiamine (TMPD) with 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) and with fully deuterated TCNQ are reported. The assignment of the vibrational data is obtained on the basis of the comparison with that of neutral and ionized parent molecules; additional relevant information is extracted from the low temperature (approximately 15 K) infrared and Raman spectra.