Mixed-valent diruthenium (II,III) aliphatic carboxylates: columnar mesophases in dodecylsulfate and octylsulfonate derivatives

ZULEMA CHAIA; ANDRÉS ZELCER; BERTRAND DONNIO; MARCIA RUSJAN; FABIO D. CUKIERNIK*; DANIEL GUILLON

LIQUID CRYSTALS

Taylor & Francis

Año: 2004 vol. 31 p. 1019 - 1025

0267-8292

            Two series of polymeric mixed-valent diruthenium (II,III) aliphatic carboxylates of formula Ru2(O2C(CH2)n-2CH3)4X (where X=dodecylsulfate (DOS) anion and n = 4, 8, 9, 16 and 18 or X=octylsulfonate (OS) anion and n = 8, 10, 12 , 14 and 18) were synthesized and characterized. Their liquid-crystalline (LC) properties and crystalline (Cr) structure were analysed. The Cr phases are lamellar in all cases. For long chain DOS derivatives (n= 16 and 18) hexagonal and rectangular columnar mesophases (Colh and Colr) with melting temperatures close to 140oC were observed. For long chain OS derivatives (n³10) a Colh mesophase was observed, with melting temperatures between 140 and 190oC.