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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

✍ Scribed by Iolinda Aiello; Mauro Ghedini; Massimo La Deda; Daniela Pucci; Oriano Francescangeli

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 253 KB
Volume: 1999
Category: Article
ISSN: 1434-1948
DOI: 10.1002/(sici)1099-0682(199908)1999:8<1367::aid-ejic1367>3.0.co;2-m

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✦ Synopsis

The bis[4-(n-C m H 2m+1 O)-5-(p-C 14 H 29 C 6 H 4 N=N)]-substituted "unconventional" (lateral-tailed) molecular shape form. These Ni[L N (m,14)] complexes, showing nematic and smectic N,NЈ-salicylidenediamines H 2 [L N (m,14)] (N = 1: 1,2diaminoethane; N = 2: 1,3-diaminopropane; N = 3: 1,3-disordered phases, are stable over a quite large temperature range and have been characterized by different diamino-2,2-dimethylpropane; m = 6 or 18) have been synthesized. Both the N = 2 and 3 series of compounds spectroscopic techniques. The newly synthesized mesogens exhibit lower transition temperatures and higher thermal display a smectic C (SmC) mesophase, with clearing points well below 100 °C. By treating the H 2 [L N (m,14)] ligands with stability than homologous complexes Ni[L N (14)] with a "conventional" rod-like molecular geometry. an Ni II salt, liquid crystalline mononuclear complexes with gands bearing the n-C 14 H 29 alkyl chains. However, all these

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