Abstract
Organic photoconductor, pinacyanol chloride, has been studied with infrared spectroscopy because of its thermal activation energy (Ea) and band gap (Eg = 2Ea) lying in the infrared range. Particularly, pinacyanol chloride and its charge transfer (CT) complexes with chloranil, DDQ, TCNQ and TCNE as organic acceptors are studied in details. The CT complexes are having neither two absorption edges like ternary complex having one donor and two acceptors nor binary type with Lorentzian or Gaussian envelopes. The forbidden gap is direct band gap except chloranil complex due to increase in molecular distance and CT interaction. There is imperfect nesting and partial screening determining the mid-IR envelope, which is qualitatively different from the envelopes in binary systems. There is inverted parabola in some range below this envelope. It is explained how infrared absorption is related with the applications of such organic photoconductors in optoelectronic devices.
Highlights
The subject of charge transfer complexes has been very old [1]-[3]
We have reported transport properties and effect on band-gap of pinacyanol Chloride when it forms charge transfer (CT) with organic acceptors
The structures of pinacyanol chloride and organic acceptors used in the present work are shown (Figure 1)
Summary
The subject of charge transfer complexes has been very old [1]-[3]. After finding organic metals and other quasione-dimensional conductors [4] [5], this important branch of chemical physics has undergone a renewed interest. This is how the subject of one-dimensional conductors has been connected with advanced energetics [6]-[20]. We have reported transport properties and effect on band-gap of pinacyanol Chloride when it forms CT with organic acceptors. Transmission spectra of the charge transfer complexes of pinacyanol is reported. The structures of pinacyanol chloride and organic acceptors used in the present work are shown (Figure 1)
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