Poly LUMO energy level

In poly[2,5-bis(3,4-ethylene-dioxy-2-thienyl)pyridine], a copolymer of thiophene and pyridine in a 2 1 ratio, the effective HOMO and LUMO energy levels of the ir-system are controlled in such a way that both p-doped and n-doped states are accessible (Scheme 9) [43]. The thin fdms display multicolor... 

Intensive effort has been devoted to the optimization of CCP structures for improved fluorescence output of CCP-based FRET assays. The inherent optoelectronic properties of CCPs make PET one of the most detrimental processes for FRET. Before considering the parameters in the Forster equation, it is of primary concern to reduce the probability of PET. As the competition between FRET and PET is mainly determined by the energy level alignment between donor and acceptor, it can be minimized by careful choice of CCP and C. A series of cationic poly(fluorene-co-phenylene) (PFP) derivatives (IBr, 9, 10 and 11, chemical structures in Scheme 8) was synthesized to fine-tune the donor/acceptor energy levels for improved FRET [70]. FI or Tex Red (TR) labeled ssDNAg (5 -ATC TTG ACT ATG TGG GTG CT-3 ) were chosen as the energy acceptor. The emission spectra of IBr, 9, 10 and 11 are similar in shape with emission maxima at 415, 410, 414 and 410 nm, respectively. The overlap between the emission of these polymers and the absorption of FI or TR is thus similar. Their electrochemical properties were determined by cyclic voltammetry experiments. The calculated HOMO and LUMO... 

Cyclopenta[2, l -k 3,4-l/]d ithiophen-4-one 581 was considered as a first approximation to it. Ketone 581 displays its lowest n n transition at max = 472 nm (s = 1250). Upon electropolymerization, this long wavelength absorption shifts to 740 nm in the neutral polymer, a red shift of > 200 nm compared to PT. A strong absorption at 425 nm is also present in poly-581. If we assume that the lower energy absorption in neutral poly-581 is derived primarily from the aromatic HOMO-LUMO transition, and the higher energy transition arises between some deeper level and the LUMO. The Egap is < 1.2 eV. 

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