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Synthesis, Mesomorphism, and Spectroscopic Characterization of Bis[4‐( n ‐alkoxy)‐5‐( p‐n ‐tetradecylphenylazo)]‐Substituted ( N , N′ ‐Salicylidenediaminato)nickel(II) Complexes
Author(s) -
Aiello Iolinda,
Ghedini Mauro,
La Deda Massimo,
Pucci Daniela,
Francescangeli Oriano
Publication year - 1999
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199908)1999:8<1367::aid-ejic1367>3.0.co;2-m
Subject(s) - chemistry , mesophase , homologous series , nickel , crystallography , thermal stability , alkoxy group , liquid crystal , stereochemistry , phase (matter) , organic chemistry , alkyl , materials science , optoelectronics
The bis[4‐( n ‐C m H 2 m +1 O)‐5‐( p ‐C 14 H 29 C 6 H 4 N=N)]‐substituted N , N′ ‐salicylidenediamines H 2 [L N ( m ,14)] ( N = 1: 1,2‐diaminoethane; N = 2: 1,3‐diaminopropane; N = 3: 1,3‐diamino‐2,2‐dimethylpropane; m = 6 or 18) have been synthesized. Both the N = 2 and 3 series of compounds display a smectic C (SmC) mesophase, with clearing points well below 100 °C. By treating the H 2 [L N ( m ,14)] ligands with an Ni II salt, liquid crystalline mononuclear complexes with “unconventional” (lateral‐tailed) molecular shape form. These Ni[L N ( m ,14)] complexes, showing nematic and smectic disordered phases, are stable over a quite large temperature range and have been characterized by different spectroscopic techniques. The newly synthesized mesogens exhibit lower transition temperatures and higher thermal stability than homologous complexes Ni[L N (14)] with a “conventional” rod‐like molecular geometry.