Study of the hydrogen bonding of 1,4-bis[(3,4,5-trihexyloxyphenyl)hydrazide]phenylene in crystalline and liquid crystalline phases using infrared,Raman, and two-dimensional correlation spectroscopy |
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| Institution: | 1. College of Physics, Jilin University, Changchun, PR China;2. Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan;3. College of Materials Science and Engineering, Jilin University, Changchun, PR China;1. Department of Chemistry, Laboratory of Polymer Chemistry (LCP), University of Oran 1 Ahmed Benbella, BPN°1524 El’Menouer, 31000, Oran, Algeria;2. Center of Scientific and Technical Research in Physicochemical Analyzes (CRAPC), BP 384, Siège Ex-Pasna Zone Industrielle, Bou-Ismail CP, 42004, Tipaza, Algeria;1. Submillimeter-Wave Technology Laboratory, University of Massachusetts Lowell, Lowell, MA 01854, United States;2. Department of Physics and Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada;1. Mathematics, Physics and Engineering Department, Albany State University (West Campus), Albany, GA 31707, USA;2. Canadian Light Source. Inc., University of Saskatchewan, 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada;1. School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;1. Department of Chemistry and Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh, 160014, India;2. Dr SSB UICET, Panjab University, Chandigarh, 160014, India;3. School of Engineering, Department of Chemical Engineering, The University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom |
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| Abstract: | The vibrational bands of a dihydrazide derivative, 1,4-bis(3,4,5-trihexyloxyphenyl)hydrazide]phenylene (TC6), observed in the Raman and infrared spectra were assigned. The intermolecular hydrogen bonding vibrational bands due to C O and NH groups in the low-frequency Raman spectra were observed at 111 and 94 cm−1 in the crystalline and liquid crystalline (LC) phases, respectively. The sequential order of changes in the hydrogen bonding and alkyl chains was opposite in the crystalline and LC phases. The modifications in the hydrogen bonding occurred prior to conformational changes in the hydrocarbon chains in the crystalline phase; however, a reverse trend was observed in the LC phase. Simultaneously, the two-dimensional (2D) IR and Raman correlation spectroscopic analysis showed that the amide I band of TC6 in the LC phase comprised at least five distinct bands. In addition, the hetero 2D correlation between the NH and CO groups confirmed that no free NH and CO groups existed in the LC phase. |
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| Keywords: | Two-dimensional correlation analysis Infrared spectroscopy Raman spectroscopy Intermolecular hydrogen bonding Hexagonal columnar mesophase Liquid crystals |
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