Ground states of one-dimensional organic conductors based on ChTM-TTP (2-(4
,5-cyclohexylenedithio-1,3-dithiol-2-ylidene)-5-[4,5-bis(methylthio)-1,3-di
thiol-2-ylidene]-1,3,4,6-tetrathiapentalene) have been investigated. (ChTM-
TTP)(2)X (X = AuBr2, Au(CN)(2), GaCl4) shows antiferromagnetic phase transi
tion around 30 K. The phase sequence of(ChTM-TTP)(2)X is similar to that of
(TMTTF)(2)Br. The strength of the dimerization and the one-dimensionality
controls the ground states of not only (ChTM-TTP)(2)X but also (TMTCF)(2)X.