Synthesis and characterization of some non-symmetric iminic-thiadiazole derivatives and investigation of their mesomorphic behaviors

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-03-13 DOI:10.1016/j.molstruc.2025.142066

Hadeel Q.A. Habeeb, Ivan Hameed R. Tomi

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引用次数: 0

Abstract

A series of new 1,3,4-thiadiazole mesogens have been synthesized, incorporating imine as an interconnection and alkoxy chain within their chemical structures. The synthesized precursors and compounds of series of N-(4-alkoxybenzylidene)-4-(5-(p-tolyl)-1,3,4-thiadiazol-2-yl)aniline (L6-n) derivatives were characterized using various analytical techniques to confirm their structure and purity. These techniques included: (FT-IR), both ¹H NMR and ¹³C NMR and mass spectroscopy, they provided comprehensive data, allowing the verification of the chemical structure and purity of the synthesized L6-n compounds. Differential Scanning Calorimetry (DSC) and Polarized Optical Microscopy (POM) have been employed as key techniques to examine the liquid crystalline behaviors of the synthesized compounds. All compounds in series (L6-n) display enantiotropic liquid crystalline properties. The first three mesogens in this series show only the nematic phase (N) while other homologs display both nematic and smectic C (SmC) phases in different thermal ranges. The mesomorphic properties were found to be dependent on the length of alkoxy chains attached at the end of the molecules. In this study, the mesomorphic properties of the synthesized compounds were compared with those of other compounds possessing similar chemical structures. The objective was to investigate the correlation between the chemical structure and the type of mesomorphic properties displayed by these compounds.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.