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The reaction between 4,5,6,7-tetra-hydro-2-(4,5,6,7-tetra-hydro-1,3-benzodi-thiol-2-yl-idene)-1,3-benzodi-thiole (common name: 4,4',5,5',6,6',7,7'-octa-hydro-dibenzo-tetra-thia-fulvalene, OMTTF) and an excess of iodine in tetra-hydro-furan (THF) yielded the respective radical organic polyiodide salt, C 14 H 16 S 4  + ·I 3  - . The asymmetric unit contains one and a half formula unit of both the cation and the anion, with the half-ions completed through inversion symmetry. The (OMTTF + ) positive charge can be assigned by the bond distances and the planar structure of the C 2 S 2 C=CS 2 C 2 central fragment. In the crystal, trimers of triiodide anions are connected through secondary inter-molecular I⋯I inter-actions into almost linear I 9  3- polyanions. The non-centrosymmetric OMTTF radical cations are linked by S⋯S inter-actions into centrosymmetric dimers, while the centrosymmetric OMTTF cations remain as discrete units. The (OMTTF + ) radical cations and the triiodide anions are linked by weak C-H⋯I and C-H⋯S inter-actions into a three-dimensional network. This work reports the fourth crystalline modification of the C 14 H 16 S 4  + ·I 3  - salt. The three previous modifications were obtained from a mixture of aceto-nitrile and toluene [Konarev et al. (2005 ▸). Synth. Met.  151 , 231-238].

acta crystallographica. section e, crystallographic communications

Synthesis, crystal structure and Hirshfeld analysis of a new crystalline modification of the radical ion salt octamethylenetetrathiafulvalenium triiodide (OMTTF)I<sub>3</sub>

Synthesis, crystal structure and Hirshfeld analysis of a new crystalline modification of the radical ion salt octamethylenetetrathiafulvalenium triiodide (OMTTF)I3

Synthesis, crystal structure and Hirshfeld analysis of a new crystalline modification of the radical ion salt octamethylenetetrathiafulvalenium triiodide (OMTTF)I₃