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Determination of charge transfer in molybdenum complexes of 7,7,8,8-tetracyano-p-quinodimethane with vibrational spectroscopy

✍ Scribed by E Faulques; A Leblanc; P Molinié; M Decoster; F Conan; J.E Guerchais; J Sala-Pala

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
887 KB
Volume
51
Category
Article
ISSN
1386-1425

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✦ Synopsis

The influence of charge transfer on the vibrational lines of three new molybdenum TCNQ complexes MoO(dtc)3 la, Mo(dtc)4 2a, and Mo(dtc)42 3a is reported (dtc = Et2NCS2). It is shown that Raman scattering is able to probe the charge state of TCNQ entities in these complexes. Infrared spectra are discussed and compared to Raman spectra. Electronic polarization of the TCNQ moieties and reduction of TCNQ ° in TCNQ ° is found for all complexes. The estimated charge transferred when reduction occurs is one electron onto the TCNQ molecule whereas it is about 0.2-0.3 electron onto nitrile groups. The formation of monomers and dimers of TCNQ in these complexes is discussed in relation with specific Raman lines found in reference compounds such as TCNQ salts of alkali. These new Raman data suggest to us that TCNQ moieties form mainly dimers and monomers in complexes la and 2a, respectively.

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Conducting and insulating salts of phosp
Conducting and insulating salts of phosphiniminium cations with 7,7,8,8-tetracyano-p-quinodimethane (TCNQ)
✍ Martin R. Bryce; Adrian J. Moore; Y.H. Kim; Z-X. Liu; M.J. Nowak 📂 Article 📅 1987 🏛 Elsevier Science 🌐 French ⚖ 177 KB

A new series of cation-TCNQ salts is described: phosphiniminium cations ( 1) and ( 2) form 1:2 salts with TCNQ that are organic conductors (art 0.05-0.15 S cm-l) whereas cations ( 3) and ( 4) form insulating 1:l salts;