4,5-Dimercapto-1,3-dithiole-2-thione dmit

Dimercapto-l,3-dithiole-2-thione (dmit, 46) and 4,5-dihydro-l,4-dithiin-2,3-dithiolate (dddt, 47) ligands can be reacted with transition metal ions to give M(dmit)2 and M(dddt)2 complexes (M = Pt, Pd, Ni, and Au) [91]. The M(dmit)2 and M(dddt)2 anions, like BEDT-TTF, have numerous peripheral sulfur atoms and are planar. Additionally, they have variable redox potentials that can be adjusted through the metal that is selected. 

The donor-acceptor complex (TTF)[Pt(dmit)2]3 (dmit = 4,5-dimercapto-l,3-dithiol-2-thione) and its Group 10 congeners have been reported, and their electrical conductivities have been... 

Bulk crystalline radical ion salts and electron donor-electron acceptor charge transfer complexes have been shown to have room temperature d.c. conductivities up to 500 Scm-1 [457, 720, 721]. Tetrathiafiilvalene (TTF), tetraselenoful-valene (TST), and bis-ethyldithiotetrathiafulvalene (BEDT-TTF) have been the most commonly used electron donors, while tetracyano p-quinodimethane (TCNQ) and nickel 4,5-dimercapto-l,3-dithiol-2-thione Ni(dmit)2 have been the most commonly utilized electron acceptors (see Table 8). Metallic behavior in charge transfer complexes is believed to originate in the facile electron movements in the partially filled bands and in the interaction of the electrons with the vibrations of the atomic lattice (phonons). Lowering the temperature causes fewer lattice vibrations and increases the intermolecular orbital overlap and, hence, the conductivity. The good correlation obtained between the position of the maximum of the charge transfer absorption band (proportional to... 

LB films prepared from tridecylmethyl-ammonium Au-(dmit)2 and H2dmit = 4,5-dimercapto-l,3-dithiol-2-thione, transferred to hydrophobized glass substrates, and oxidized (by Br2 or electrochemicaily) Absorption spectra and temperature-dependent conductivity measurements... 

Similar examinations of the CT spectra for bis(propylenedithio)-tetrathiafulvalene (BPDT-TTF) salts [36], BEDT-TTF salts [37], and bis-tetramethylenetetraselenafulvalene-(4,5-dimercapto-l,3-dithiole-2-thione)nickel [OMTSF-Ni(DMIT)2] salt [38] have been performed. The latter salts are examples of organic conductors that are almost isotropic in two dimensions. Thus only weak polarization dependence is found in the entire frequency range. The analysis of the spectra within a simple DA-charge oscillator model, which takes into account the coupling to intramolecular vibrational modes, demonstrates how IR and optical measurements can provide estimates for a number of physical parameters for lowdimensional organic conductors. 

Furthermore, superconductivity has been found in some salts based on the acceptor molecule M(dmit)2, where M = Ni, Pd, or Pt and dmit is 4,5-dimercapto-l,3-dithiole-2-thione (= C3S5) [22, 23]. 

S-Bi-S modes were seen in the range 220-351 cm-1 in the IR spectra of [Bi(dmit)2], where H2dmit = 4,5-dimercapto-l,3-dithiol-2-thione.606... 

The complex [Ni(dmit)2](But4N)o,29 (292) (dmit = 4,5-dimercapto-l,3-dithiole-2-thione anion) has been obtained % the oxidation of the monoanionic complex with bromine. The conductivity of this compound is 10 S cm at 300 K. 

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