Structural Alignment in Charge Transfer Complexes

Similar considerations for a non-zero overlap integral between the occupied ttu molecular orbital of ethylene and the unfilled Ss atomic orbital 

Of interest are the self-complexes formed by /nnitroaniline, quinhydrone, etc, where the same species has both donor and acceptor character in different portions of the molecule. In such a case the ground state of the complex is given by equation (7) with b -- c. The presence of charge transfer forces in these species leads to a closer packing of these molecules in their crystals than would occur in the absence of these forces33 43 78. 

1 Pfeiffer, P., Organische Molekulverbindungen, 2nd Edition, Ferdinand Enke, Stuttgart, 1927. 

80 Mulliken, R. S., Symposium on Molecular Physics, Nikko, Japan, 1953, p. 45. 

88 Hilsch, R. and Pohl, R. W., Nachr.ges. Wiss. Gottingen, Jahresber. geschdftsjahr Math-Physik kl., 1934, No. 9 1935, No. 19. 

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