## Abstract

A valence bond (VB) description is introduced for organic charge-transfer (CT) salts based on mixed stacks . . . D** plus **yA** minus **yD** plus **yA** minus **y . . . of donors (D) and acceptors (A). Extrapolating exact results for finite rings shows that the magnetic gap DELTA E//m is finite for gamma less than gamma //c equals 0. 68 plus or minus 0. 01 and vanishes for gamma greater than gamma //c as expected in the paramagnetic ionic limit gamma equals 1. The small finite DELTA E//m in the ″ionic″ TMPD-TCNQ complex indicates incomplete CT, in agreement with the resonant Raman result of gamma similar 0. 7. The extension of diagrammatic VB techniques to partly-filled segregated ion-radical stacks like . . . A** minus **yA** minus **yA** minus **yA** minus **y or D** plus **yD** plus **yD** plus **yD** plus **y . . . is discussed.

Original language | English (US) |
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Pages | 93-102 |

Number of pages | 10 |

State | Published - 1978 |

Event | Proc of the Int Symp on Org Solid State Chem, 5th, pt B - Brandeis Univ, Waltham, Mass Duration: Jun 13 1978 → Jun 16 1978 |

### Other

Other | Proc of the Int Symp on Org Solid State Chem, 5th, pt B |
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City | Brandeis Univ, Waltham, Mass |

Period | 6/13/78 → 6/16/78 |

## ASJC Scopus subject areas

- General Engineering