Preparation and Magnetic Properties of All Organic Biradical Liquid Crystals

Abstract

Here we report the preparation and magnetic properties of two different types of all-organic biradical liquid crystalline (LC) compounds (S,S,S,S)-1 and (R,S)-2. (S,S,S,S)-1 showed a chiral nematic phase and (R,S)-2 did a discotic phase. By SQUID magnetization measurement, (S,S,S,S)-1 showed strong magnetic interaction ( J > 0) at the crystal-to-LC phase transition, while (R,S)-2 exhibited antiferromagnetic interactions at low temperatures and a substantial increase in the molar magnetic susceptibility at the crystal-to-discotic LC phase transition.