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In a series of three TTF-derived dicyanofluorene charge transfer complexes, an increase of the intermolecular charge transfer has been observed for both addition of nitro groups and a suitable symmetry of the fluorene skeleton. A numerical calculus of the charge transfer was based on IR spectroscopy data with respect to the stretching absorption band of the nitrile group.

A series of metal containing organic compounds of the M[HNAFIN], . 2TCNQ-type, being M either Ni, Pd, Pt, Cu or Zn, have been prepared and studied in respect to infrared absorption spectra. Characteristic IR absorption spectra for each of the compounds are manifest, depending on the nature of the metal introduced. In particular is the C = N stretch mode absorption spectrum for Ni-containing compounds rather sharp and single peaked, while Pt and Zn containing compounds present more complex features.

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