Syntheses, Characterisation And Mesophase Investigation Of A New Class Of Hydrazine-Based Liquid Crystal Dimers

• Main Author: Abd Rani, Umairah
• Format: Thesis
• Language: English
• Published: 2016
• Subjects: QD1-999 Chemistry
• Online Access: http://eprints.usm.my/31994/

Empat siri baru hablur cecair dimer tak simetri yang berdasarkan dibenzilidinahidrazina, N-{4[10-(16-desiloksifenilimino) metil)fenoksi] alkiloksiben zilidina}-N'-(4'-desiloksibenzilidina)hidrazina (SB-(CH2)n-HZ), N-{4[10-(16-desilok sifenildiazenil)fenoksi]alkiloksibenzilidina}-N'-(4'-desiloksibenzilidina) hidrazine (A Z-(CH2)n-HZ), N-[4-{12-[18-((S)-(-)-23-metilbutiloksi)karbonilfenil]fenoksi}alkilok sibenzilidina]-N'-(4'-desiloksibenzilidina)hidrazina (BP-(CH2)n-HZ) dan N-(4-alkil oksibenzilidina)-N'-[4'-(kolesteriloksikarbonil)alkiloksibenzilidina]hidrazina (Chol- (CH2)m-HZ-(CH2)n) telah disintesis dan dicirikan. Kesemua dimer ini mengandungi dibenzilidinahidrazina sebagai salah satu kumpulan mesogenik dan berbeza antara satu sama lain dari segi cabang sisi dan panjang spaser. Struktur molekul bagi dimer tersebut telah dijelaskan oleh analisis CHN, spektroskopi FT-IR, 1D dan 2D-NMR. Ciri hablur cecair dimer ini telah dikaji dengan menggunakan POM, DSC dan XRD. Four new series of non-symmetric dibenzylidenehydrazine-based liquid crystal dimers, N-{4[10-(16-decyloxyphenylimino)methyl)phenoxy] alkyloxybenzy lidene}-N'-(4'-decyloxybenzylidene)hydrazines (SB-(CH2)n-HZ), N-{4[10-(16-decyl oxyphenyldiazenyl)phenoxy]alkyloxybenzylidene}-N'-(4'-decyloxybenzylidene) hyd razines (AZ-(CH2)n-HZ), N-[4-{12-[18-((S)-(-)-23-methylbutyloxy)carbonylphenyl] phenoxy} alkyloxybenzylidene]-N'-(4'-decyloxybenzylidene) hydrazines (BP-(CH2)n -HZ) and N-(4-alkylxybenzylidene)-N'-[4'-(cholesteryloxycarbonyl)alkyloxybenzylid ene]hydrazines (Chol-(CH2)m-HZ-(CH2)n) had been synthesised and characterised. All dimers incorporated dibenzylidenehydrazine as one of the mesogenic arms and differ in terms of the other side arms and spacer parity. The molecular structures of these dimers were elucidated by CHN, FT-IR, 1D and 2D-NMR spectroscopy. Their liquid crystalline properties were investigated using POM, DSC and XRD.