Oligothiophenes optical characterization

The electronic structure of oligothiophenes is characterized by UPS and MO calculations for the occupied states and by a variety of optical techniques for the transition between occupied and unoccupied levels. Because of the vast number of papers on optical measurements, only a selection demonstrating the most important features can be presented here. 

Bongiovanni, G., C. Botta, J.L. Bredas, D.R. Ferro, A. Mura, A. Piaggi, and R. Tubino. 1997. Conformational analysis and optical characterization of oligothiophene inclusion compounds. Chem Phys Lett 278 146. 

G. Sotgiu, M. Zambianchi, G. Barbarella, F. Aruffo, F. Cipriani and A. Ventola, Rigid-core fluorescent oligothiophene-5, 5 -dioxide iso thiocyanates. Synthesis, optical characterization and conjugation to monoclonal antibodies, J. Org. Chem., 68, 1512-1520 (2003). 

R. D. Myrex, G. M. Gray, A. G. VanEngen Spivey and C. M. Lawson, Synthesis and characterization of transition metal systems containing phosphino-oligothiophene ligands for nonlinear optical materials, Organometallics, 25, 5045-5050 (2006). 

The geometric, electronic and optical properties of oligothiophenes of two, four, six and eight units of head-to-head-tail-to-tail (HH-TT) regioselectivity and substituted by methyl, thiol and thiomethyl groups (Chart 8.15) were characterized in their neutral and p-doped states with quantum chemical calculations derived from semiempirical HF approaches and with the nonempirical valence effective Hamiltonian (VEH) method. Such calculations provide a good insight into the electronic properties measured for electropoly-merized chains [91]. 

J. Cornil and J. L. Bredas, Nature of the optical transitions in charged oligothiophenes, Advan. Mater., 1995, 7, 295 J. Comil, D. Beljonne and J. L. Bredas, Nature of optical transitions in conjugated oligomers. 2. Theoretical characterization of neutral and doped oligothiophenes, J. Chem. Phys., 1995, 103, 842. 

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