Infrared spectra of ternary CTCS of TMPD

The ternary charge transfer complexes of TMPD (N,N,N,N- tetramethyl-p- phenylene diamine) have been studied with FTIR spectroscopy. The complexes have two-lower and higher-absorption edges in infrared range associated with two acceptors. TMPD-chloranil – I2 have 0.22 eV and 0.12 eV as edges while TMPD-DDQ-I2have 0.28eV and 0.12 eV as edges. Similar edges at 0.22 eV and 0.09eV are found in TMPD-TCNQ-I2 and 0.27 eV and 0.12 eV in TMPD-TCNE-I2 complex. The analysis of free-carrier absorption shows scattering by acoustic phonons in TMPD-Chloranil-I2 and TMPD-TCNE-I2 complexes while impurity scattering in TMPD-DDQ-I2 and TMPD-TCNQ-I2complexes. Chloranil and TCNE based ternary complexes are highly conducting.