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The dication of tetrakis(dimethylamino)ethene (TDAE 2+ ) forms ion pair complexes with [M(mnt) 2 ] 2- , mnt 2- = maleonitrile-2,3-dithiolate, M(II) = Ni, Pd, Pt, and Zn. According to X-ray analysis the structure of {TDAE 2+ [Pt(mnt) 2 ] 2-  } consists of a chain-like arrangement of planar dianions and twisted (71°) dications. Shortest interionic contacts are 11 pm longer than the corresponding van der Waals radii. In the UV-VIS diffuse reflectance spectra of the complexes with a d 8  central metal there is no unambiguous evidence for the presence of an ion pair CT band. This band is observed, however, at 450 nm when the d 10  metal Zn(II) is present. Application of the Hush-Marcus model affords a reorganization energy of 110 kJ / mol for electron transfer from [Zn(mnt) 2 ] 2-  to TDAE 2+ . This value is 40 kJ / mol higher than the one reported for the analogous complex wherein TDAE 2+  is replaced by a 2,2′-bipyridinium acceptor of similar reduction potential

Charge - Transfer Complexes of Metal Dithiolenes XXIV: Ion Pairs of the Tetrakis(dimethylamino)ethene Dication with Dithiolene Metalate Dianions