Radical Ion Salts and Complexes,Part XVII. † TCNQ Salts of 1,4-Dimethylpyridine and 2,3-Bis(1-methyl-4-pyridinio)butane

Abstract

X-Ray structure determination of the complex salts [MeNC₅H₄Me]⁺[TCNQ₂]^- [1,4-dimethylpyridinium 2(7,7,8,8-tetracyanoquinodimethane) (1-); I] and [Me(NC₅H₄)(Me)CH-CH(Me)(C₅H₄N)Me]²⁺[TCNQ₄]^2- [meso-2,3-bis(N-methyl-4-pyridyl)butane(2+) 4(7,7,8,8-tetracyanoquinodimethane) (2-); II], where TCNQ=(CN)₂C(C₆H₄)C(CN)₂, shows that, although in both salts the TCNQ moieties are stacked in columns, lateral shifts break these columns into diads for I and tetrads for II causing their electrical conductivities to be only moderate (Σ = 2–4 × 10⁻³ ohm⁻¹ cm⁻¹).