Dichloro electron affinity

Figure 1 Four one-electron donors D (1-4) with their first gas-phase ionization potentials four one-electron acceptors A (5-8) with their gas-phase electron affinities Aa, and three metals and one semimetal with their bulk work functions p. The abbreviations is N, N, N, Af -tetramethyl-para-phenylenediamine (TMPD), bisethylenedithiolene (BEDT), p-benzoquinone (BQ), and 2,3-dichloro-5,6-dicyano-l,4-benzoquinone (DDQ).

Dichloro-5,6-dicyano-l,4-benzoquinone (DDQ, 6) is a medium electron acceptor having an electron affinity of 1.9eV. (1961PCFA316). The structure of -acceptors 1-6 is as shown in Figure 1. 

The electron-accepting ability of the Ceo molecule in solution has been measured by charge-transfer absorption energy and also by the redox potentials, and it has been concluded that Ceo is a weak electron acceptor comparable to p-benzoquinone, 5-tetracyanobenzene or 2,3-dichloro-1,4-naphthoquinone, the adiabatic electron affinity of the Ceo molecule being estimated as 2.10-2.21 0.1 eV [70]. 

Tetracyanoethylene (TCNE, 1) and other n-quinones show great affinity for electrons, and thus are good dehydrogenating agents toward dihydroaromatic and dihydrohetero aromatic systems (1986JACS5453). The compounds 2,3-dichloro-l,4-naphthoquinone (DCHNQ, 2a) and... 

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