We review a wide variety of organic electronics in terms of their charge carrier mobilities, and we describe recent studies of macromolecules, molecular crystals, check details and supramolecular architecture. For example, a rigid poly(phenylene-co-ethynylene) included in permethylated cyclodextrin shows a high intramolecular hole mobility of 0.5 cm(2) V-1 s(-1), based on a combination of flash-photolysis TRMC and transient absorption spectroscopy (TAS) measurements. Single-crystal rubrene showed an ambipolarity with an isotropic charge carrier transport along each crystal axis on the nanometer scale.
Finally, we describe the charge carrier mobility of a self-assembled nanotube consisting of a large pi-plane of hexabenzocoronene (HBC) partially appended with an electron acceptor.
The local (intratubular) charge carrier mobility reached 3 cm(2) V-1 s(-1) for the nanotubes that possessed well-ordered Inhibitors,Modulators,Libraries pi-stacking, but it dropped to 0.7 cm(2) V-1 s(-1) in regions that contained greater amounts of the electron acceptor because those molecules reduced the structural integrity of pi-stacked HBC arrays. Interestingly, the long-range (intertubular) charge carrier mobility was on the order of 10(-4) cm(2) V-1 s(-1) and monotonically decreased when the acceptor content was increased. These results suggest the importance of investigating charge carrier mobilities by frequency-dependent charge carrier motion for the development of more efficient organic electronic devices.
“Although they share some superficial structural similarities with porphyrins, corroles, trianionic ligands with contracted cores, Inhibitors,Modulators,Libraries give rise to fundamentally different transition metal complexes Inhibitors,Modulators,Libraries in Inhibitors,Modulators,Libraries comparison with the dianionic porphyrins. 09 Many metallocorroles are formally high-valent, although a good fraction of them are also noninnocent, with significant corrole radical character. These electronic-structural characteristics result in a variety Drug_discovery of fascinating spectroscopic behavior, including highly characteristic, paramagnetically shifted NMR spectra and textbook cases of charge-transfer spectra. Although our early research on corroles focused on spectroscopy, we soon learned that the geometric structures of metallocorroles 00 provide a fascinating window into their electronic-structural characteristics.
Thus, we used X-ray structure determinations selleck chem inhibitor and quantum chemical studies, chiefly using OFT, to obtain a comprehensive understanding of metallocorrole geometric and electronic structures.
This Account describes our studies of the structural chemistry of metallocorroles. At first blush, the planar or mildly domed structure of metallocorroles might appear somewhat uninteresting particularly when compared to metalloporphyrins. Metalloporphyrins, especially sterically hindered ones, are routinely ruffled or saddled, but the missing meso carbon apparently makes the corrole skeleton much more resistant to nonplanar distortions.