Journal of Chemical Crystallography

, Volume 44, Issue 3, pp 161–168 | Cite as

Identification and Analysis of a 2:1 Monoclinic Phase for the Organic Donor–Acceptor Complex o-Me2TTF-TCNB: Structural and Spectroscopic Studies of a New Solid State Configuration

  • Steven P. Fisher
  • Eric W. Reinheimer
Original Paper


In this communication, we present the single crystal X-ray structure and spectroscopic properties for a newly discovered 2:1 phase for the organic donor–acceptor complex o-Me2TTF-TCNB. This new phase crystallizes in the monoclinic space group P2 1 /n with a = 7.6846(17) Å, b = 19.8987(19) Å, c = 9.1844(8) Å and β = 91.955(7)°. Valence sensitive bond distances, specifically the central C=C bond and four ancillary C–S bonds in o-Me2TTF and the cyanide groups of TCNB were compared to those from the free components and suggested that both the donor and acceptor molecules remained neutral in the complex. Additionally, infrared spectroscopy measurements were conducted and the corresponding vibrational frequencies for selected bands from the donor and acceptor molecules further support the hypothesis that neutral molecules were present.

Graphical Abstract

Herein we present the structure and infrared spectroscopic properties for the 2:1 monoclinic phase of the donor–acceptor complex o-Me2TTF-TCNB (o-Me2TTF = o-3,4-dimethyltetrathiafulvalene; TCNB = 1,2,4,5-tetracyanobenzene), a complex which has already had its 1:1 triclinic form described.





SPF and EWR would like to acknowledge California State University San Marcos for the funds necessary to purchase the Rigaku SCXMini X-ray diffractometer.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Chemistry and Biochemistry and The W.M. Keck Foundation Center for Molecular StructureCalifornia State UniversitySan MarcosUSA

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