Abstract

A study of the geometry of the structural cavity in which the anion resides in the novel (TMTSF) 2X salts has revealed a stronger than previously realized symmetry basis for the rationalization of the contrasting crystal physics displayed by salts with anions of grossly different molecular symmetries. Moreover, the asymmetry of the anion-cavity interactions in salts with tetrahedral anions leads to the identification of a principal structural driving force for anion ordering. Finally, additional symmetry arguments suggest that salts with dipolar anions with C 2v molecular symmetry are candidates for a low-temperature ferroelectric ground state.

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