Tetracyanoethylene complexes

Multilayered cyclophanes having three aromatic rings fixed in parallel planes above one another exhibit properties intermediate between those of the [2.2]paracyclophanes and the above-mentioned compounds 51 and 52. A cyclic compound of this type, (53), has apparently been isolated by Hubert 77>. The tetracyanoethylene complex of... 

Tetracyanoethylene complexes, disilanes, 816 Tetracyclone, bleaching, 734-5 Tetraethylammonium ozonide, 736 Tetragermabuta-1,3-diene, 825, 826 Tetrahedral distortion acychc organic peroxides, 103 alkyl hydroperoxides, 110 anion ligands, 119... 

More recently, statistical or direct methods have achieved a spectacular success. The basis of the method is that the lost information on the phase angle can be derived from the X-ray intensities. Two large structures thus solved by statistical methods are the dichloromethane-anthracene-tetracyanoethylene complex,4 namely, (8 C2oH10N4,2CH2C12-C6N4), and 8,14-anhydrodigitoxigenin.5... 

Table 1. Absorption maxima of tetracyanoethylene complexes with 1,3-diacetylenes and alkynes in methylene chloride...

Explain why the oscillator strengths of charge-transfer transitions in EDA complexes are low and why the absorption maximum of the charge-transfer band of tetracyanoethylene complexes with methylated benzenes is red shifted upon increasing methyl substitution (from vmax = 2.6 pm 1 for benzene to = 1.9 pm 1 for hexamethylbenzene), 343... 

Only complexes of the first three olefins could be isolated as solids whereas the latter three, possibly due to steric restrictions could not be isolated. The tetracyanoethylene complexes were more stable than the hydrocarbon and fluoro-carbon complexes of Ir(I). 

Latham, W. and Morokuma, K. Molecular Orbital Studies of Electron Donor-Acceptor Complexes I. Carbonyl Cyanide- ROR and Tetracyanoethylene Complexes , J. Am. Chem. in press. 

C1eH1oClaN202f Chloranil - 1,5-diaminonaphthalene, 43B, 780 CieHioFeNn, Ferrocene-tetracyanoethylene complex, 32B, 279 CieHioNe, p-Phenylenediamine - 1,2,4,5-tetracyanobenzene, 39B, 446 ClgH,iBrN Oy, 1-Bromo-2-aminonaphthalene - picric acid, 33B, 245 ClgHiiCrNgOiOf Tricarbonylchromiumanisole-1,3,5-trinitrobenzene complex, 31B, 275... 

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