Physico chemical investigations in Self assembled hydrogen bonded Liquid crystals

Abstract

Liquid Crystals LC the captivating materials have gained utmost newlineimportance in recent years due to their wide commercial viabilities in various newlinedisplay applications LC mesogenic phase is an intermediate state of accretion newlinebetween crystalline solid and amorphous liquid They are classified as newlinethermotropic LC temperature dependent and lyotropic LC solvent newlineconcentration Friedrich Reinitzer in the year 1888 first examined the newlinephysico chemical properties of cholesteric liquid crystals Complementary newlineinter molecular hydrogen bonds are formed between a proton donor and an newlineelectron acceptor atoms of carboxylic acids Moreover the mesogenic newlineproperties of HBLC can be tuned easily by varying the types of bonding, newlineconstitution of donor acceptor moieties and their molar composition HBLC newlineharvests a greater interest in forming novel liquid crystalline materials due to newlinetheir ease of expanding the rigid rod segment of individual components Thus newlineit leads to the inducement of new mesogenic phases which are not observed newlinein the precursors newlineHence hydrogen bond is observed to profoundly influence the newlineclearing points enthalpy values and phase polymorphism exhibited by the newlinemesogens Considering these arguments a successful attempt is made in newlinedesigning synthesizing and characterizing seventeen intermolecular hydrogen newlinebonded series comprising of 95 complexes which consists of a variety of newlinechemical constitution including chiral substitution configured on the newlinemolecular frame newline newline