Charge-transfer complexes from

In 1977, Koo and Schuster studied the CL emission produced when diphe-noyl peroxide was decomposed at 24°C in dichloromethane in the dark producing benzocoumarin and polymeric peroxide [111, 112]. No CL emission was observed directly as benzocoumarin is nonfluorescent however, in the presence of aromatic hydrocarbons light was produced because of the fluorescence of these hydrocarbons. The explanation of this phenomenon was based on the above-mentioned CIEEL the aromatic hydrocarbons, which have a low oxidation potential, transfer one electron to diphenoyl peroxide to form a charge-transfer complex, from which benzocoumarin and the corresponding hydrocarbon in the excited state are produced (Fig. 13). 

Fig. 6.1 Schematic diagram of the mixed-stack and segregated stack motifs for packing of n molecular charge-transfer complexes. (From Bernstein 99 b, with permission.)...

In a recent application of DFT to experimentally noted solvent effects on the C shifts in iodoalkynes, it was found that charge transfer complexes from DMSO solvent molecules to the iodine substituent enhanced for the Cl carbon atom [109]. Nevertheless, the overall solvent effects were found to be deshielding, due to changes in ct . Further application of the same method allowed the identification of the first iodo-substituted cumulene in different solvents [110]. 

Cross-linked polymers produced in this way cannot be worked easily. In this respect, charge transfer complexes from polymeric donors and acceptors are more advantageous. The poly(2-vinyl pyridine) and iodine complex, for example, has a specific conductivity of 10 H" cm . It is used as a cathode in Li/h batteries for implantable heart pacemakers. This solid state battery has a higher energy density than the best lead accumulators and a lifetime of about ten years. 

Figure 22-9, Absorptivity, A CT, of the charge transfer complex from p-dioxene, PD, and maleic anhydride, MAH, as a function of the volume fraction, 0m ah maleic anhydride in chloroform Initial concentrations 0.5045 (mol PD)/liter and 0.5082(mol MAH)/liter. (After S. Iwatsukiand Y. Yamashita.)...

Charge transfer complexes from a donor and an acceptor molecule are essentially held together by electrostatic forces in the ground state. The... 

CoUman, J.P., J.L. KendaU, J.L. Chen, K.A. CoUins, and J.-C. Marchon (2000). Formation of charge-transfer complexes from neutral bis(poiphyrin) sandwiches. Inorg. Chem. 39(8), 1661-1667. 

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