Thermotropic liquid crystalline α-[bis(2-hydroxyethyl)amino]ω-(4 ′-methoxybiphenyl-4-oxy)alkane hydrochlorides

Liquid crystalline α-[bis(2-hydroxyethyl)amino]- ω -(4′-methoxybiphenyl-4-oxy)alkane hydrochlorides with different spacer lengths (6, 8, 10 methylene units) have been synthesized and characterized by NMR, DSC, polarizing optical microscopy and X-ray diffraction. The melting temperatures of the hydrochlorides decrease with increasing number of methylene units in the spacer. Highly ordered and very viscous liquid crystalline (LC1) smectic phases are formed on melting. Upon further heating these phases are transformed into a less viscous smectic C phase (LC2). The temperature of the LC1-LC2 transition decreases and the temperature of the LC2 to isotropic phase transition (LC2-I transition) increases with increasing number of methylene units in the spacer.

[1]  M. Huskić,et al.  Side-chain polyesters derived from adipoyl chloride and α-(bis(2-hydroxyethyl)amino)-ω-(4'- methoxybiphenyl-4-oxy) alkanes , 2001 .

[2]  R. Weiss,et al.  The crystalline and liquid crystalline structures of benzyl-tri-octadecylammonium bromide complete the puzzle: how do Group VA halide salts with one-four long n-alkyl chains pack? , 2000 .

[3]  M. Žigon,et al.  Hard segmented side chain liquid crystal polyurethanes with azobenzene mesogenic moieties , 1999 .

[4]  Moriyuki Sato,et al.  Liquid Crystalline Ion Complexes Built from Polyacrylic Acid and Amine Containing Azobenzene Group without Mesophase. , 1999 .

[5]  M. Žigon,et al.  Synthesis of side-chain liquid crystalline polyurethanes via ester type attachment , 1998 .

[6]  M. igon,et al.  Side chain liquid crystal polyurethanes with azobenzene mesogenic moieties: Influence of spacer length on hydrogen bonding at different temperatures , 1998 .

[7]  W. Mormann,et al.  ‘Liquid crystalline’ thermosets (LCT) from diaromatic diepoxides and aromatic diamines , 1998 .

[8]  M. Žigon,et al.  Side-chain liquid crystalline polyurethanes on the basis of biphenyl mesogenic units , 1998 .

[9]  M. Brecl,et al.  Synthesis and characterization of side‐chain liquid crystal polyurethanes , 1997 .

[10]  M. Ohta,et al.  LC-polyimides, 32. Characterization of the Mitsui-Toatsu LC-polyimide and related polyimides† , 1997 .

[11]  M. Arkas,et al.  Crystal and liquid crystal behaviour of N-cyanoalkyl-N-alkyl-N,N -dimethylammonium bromides: Role of the dipole interactions of the cyano groups , 1997 .

[12]  N. Filipović-Vinceković,et al.  Phase transitions in cationic and anionic surfactant mixtures , 1996 .

[13]  A. Moreno,et al.  Studies on salts of amine-containing polymers with benzoic acids , 1995 .

[14]  S. Ujiie,et al.  Ion complex type of novel chiral smectic C* liquid crystal having chiral hydrogentartrate counterion , 1994 .

[15]  D. Guillon,et al.  Thermotropic liquid crystals from N-alkylpyridinium halides ω-substituted with a mesogenic group , 1991 .

[16]  H. Gallardo,et al.  X-Ray Crystal Structures and Directional Diamagnetic Susceptibility Calculations of Decyl and Dodecylammonium Chlorides , 1987 .

[17]  A. Scopa,et al.  Melting Behavior of Hydrocarbon Chain Molecules with Ionic End:Groups: Primary n-Alkylammonium Halides , 1982 .

[18]  K. Sawada,et al.  Solid-Solid Phase Transitions of Long-Chain n-Alkyltrimethylammonium Halides , 1981 .