MOLECULAR CRYSTALS AND LIQUID CRYSTALS
5
1
–
=
–
–
(-para), 1620 ( CH N, Str. azomethine group), 1760 ( COO group); H NMR: δH
–
–
–
(CDCl3, 400 MHz): 0.88 (t, 3 H, CH3 of OC5H11 group), 1.26–1.29 (m, 6 H, OC5H11
–
–
–
–
–
–
group), 1.73 (t, 2 H, CH2 of OC5H11 group), 4.06 (t, 2 H, OCH2 of OC5H11), 8.31
–
=
(s, 1 H, CH N group), 7.06–7.83 (4 H, first phenyl ring), 7.32–8.14 (4 H, second phenyl
ring), 8.98 (s, 1 H, Qu-H), 8.05 (s, 1 H, Qu-H), 7.64 (d, 1 H, Qu-H), 7.60 (d, 1 H, Qu-H), 7.03
(d, 1 H, Qu-H); Elemental analysis of C28H26N2O3: Calcu: C; 76.71%, H; 5.93%, O; 10.95%,
N; 6.39%, Found: C; 76.67%, H; 5.87%, O;−110.89%, N; 6.34%.
– – –
Compound (C10): FT-IR (KBr) in cm : 3031 ( C H Str in aromatic), 1364 and 1236
– –
–
–
–
( C O str), 644 Polymethylene ( CH2 )n of OC10H21, 808 disubstituted aromatic ring
(-para), 1631 ( CH N, Str. azomethine group), 1760 ( COO group); H NMR: δH (CDCl3,
400 MHz): 0.88 (t, 3 H, CH3 of OC10H21 group), 1.26–1.29 (m, 12 H, OC10H21 group),
1.73 (P, 2 H, CH2 of OC10H21 group), 4.06 (t, 2 H, OCH2 of OC10H21), 8.34 (s, 1 H,
1
–
=
–
–
–
–
–
–
–
–
–
–
–
=
CH N group), 7.06–7.83 (4 H, first phenyl ring), 7.32–8.16 (4 H, second phenyl ring), 8.98
(s, 1 H, Qu-H), 8.05 (s, 1 H, Qu-H), 7.64 (d, 1 H, Qu-H), 7.60 (d, 1 H, Qu-H), 7.03 (d, 1 H,
Qu-H); Elemental analysis of C33H36N2O3: Calcu: C; 77.95%, H; 7.08%, O; 9.44%, N; 5.51%,
Found: C; 77.88%, H; 7.01%, O; 9.39%, N;−51.49%.
– – –
Compound (C14): FT-IR (KBr) in cm : 3031 ( C H Str in aromatic), 1364 and 1236
– –
–
–
–
( C O str), 642 Polymethylene ( CH2 )n of OC14H29, 808 disubstituted aromatic ring
(-para), 1631 ( CH N, Str. azomethine group), 1760 ( COO group); H NMR: δH (CDCl3,
400 MHz): 0.88 (t, 3 H, CH3 of OC14H29 group), 1.26–1.29 (m, 14 H, OC14H29 group),
1.73 (P, 2 H, CH2 of OC14H29 group), 4.06 (t, 2 H, OCH2 of OC14H29), 8.34 (s, 1 H,
1
–
=
–
–
–
–
–
–
–
–
–
–
–
–
=
CH N group), 7.06–7.83 (4 H, first phenyl ring), 7.32–8.14 (4 H, second phenyl ring), 8.98
(s, 1 H, Qu-H), 8.05 (s, 1 H, Qu-H), 7.64 (d, 1 H, Qu-H), 7.60 (d, 1 H, Qu-H), 7.03 (d, 1 H,
Qu-H); Elemental analysis of C37H44N2O3: Calcu: C; 78.72%, H; 7.80%, O; 8.51%, N; 4.96%,
Found: C; 78.68%, H; 7.74%, O; 8.47%, N;−41.93%.
– – –
Compound (C16): FT-IR (KBr) in cm : 3031 ( C H Str in aromatic), 1363 and 1240
–
–
–
(-C-O str), 566 Polymethylene ( CH2 )n of OC16H33, 808 disubstituted aromatic ring (-
para), 1631 ( CH N, Str. azomethine group), 1760 ( COO group); H NMR: δH (CDCl3,
400 MHz): 0.88 (t, 3 H, CH3 of OC16H33 group), 1.26–1.29 (m, 18 H, -OC16H33 group),
1.73 (P, 2 H, CH2 of OC16H33 group), 4.06 (t, 2 H, -OCH2- of OC16H33), 8.34 (s, 1 H,
1
–
=
–
–
–
–
–
–
–
–
–
=
CH N group), 7.06–7.82 (4 H, first phenyl ring), 7.31–8.14 (4 H, second phenyl ring), 8.98
(s, 1 H, Qu-H), 8.05 (s, 1 H, Qu-H), 7.64 (d, 1 H, Qu-H), 7.60 (d, 1 H, Qu-H), 7.03 (d, 1 H,
Qu-H); Elemental analysis of C39H48N2O3: Calcu: C; 79.05%, H; 8.10%, O; 8.10%, N; 4.72%,
Found: C; 78.98%, H; 8.04%, O; 8.04%, N; 4.68%.
3. Result and investigation
3.1. POM investigation
The targeted compounds were synthesized by the reaction of 4-((4-n-alkoxy benzylidene)
amino) benzoic acid with 8-hydroxy quinoline. In order to investigate the influence of central
linkage group in presence of quinoline core on the mesophase behaviour of liquid crystalline
compounds. In the present article, we have synthesized and study the effect of linking group
as well as the effect of increasing alkyl chain with rigid core such as benzene and quinoline
core. In present investigation, we have prepared total thirteen homologous (C1 to C8, C12,
C14, C16, C18). The mesophase commences from early C3 homologue. Compounds C3 to C7
display SmC and SmA mesophase, while compound C8, C10, C12, C14, C16, C18 display SmC
as well as nematic mesophase enantiotropically manner. Odd-even effect has been observed