Chemical design of homochiral heterocyclic organic ferroelectric crystals.

Single component organic ferroelectrics of spirooxazacamphorsultam derivatives, 1- SSR and 1- RRS , exhibit well-defined ferroelectricity ( P s = 2.2 μC cm -2 ) and piezoelectricity ( d 33 = 10 pC N -1 ) below their melting point. More importantly, they possess a low acoustic impedance value of 2.7 × 10 6 kg s -1 m -2 , which is well-matched with body tissues.