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Mesomorphic Studies on a Series of Nickel (II) Centered Aromatic Complexes Displaying Liquid Crystalline Phases

World Journal of Condensed Matter Physics 2022年第3期12卷 27-37页

作者： Wajdi Michael Zoghaib carlo carboni Mohammed Elias Molla Turkiya Al-Shahumi Raya Al-Yazeedi Department of Chemistry Sultan Qaboos University Al-Khod Sultanate of Oman Department of Physics Sultan Qaboos University Al-Khod Sultanate of Oman Department of Chemistry Jahangirnagar University Dhaka Bangladesh

Two new series (A & B) of three materials each based on the aroyl hydrazinato-nickel (II) complex were synthesized and characterized. The core molecule in these series consists of two 4-benzoyloxy benzylidene moieties and two benzene rings attached at the azomethine moiety. These latter benzene rings have one or two alkoxy chains comprised of either 10, 12, 16 or 18 carbon atoms. The characterization of these two series by polarized optical microscopy and differential scanning calorimetry is described herein. Upon cooling from the Isotropic phase, three of the six materials display a monophasic columnar phase and the other three possess a biphasic nematic and columnar phases. Upon heating, all six materials have a clearance point at high temperatures without displaying mesomorphic behavior. In series B mesogens, it was observed that the longer the hydrocarbon tail length, the lower the clearance point.

关键词： Columnar Mesomorphic Nematic Discotic Metallomesogens Polarized Optical Microscopy Differential Scanning Calorimetry

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Phase Transition Investigations of a Series of Aromatic Naphthalene-2-yl-4-(Alkoxy) Benzoate and Naphthalene-1-yl-4-(Alkoxy) Benzoate Materials

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World Journal of Condensed Matter Physics 2022年第1期12卷 1-7页

作者： Wajdi Michael Zoghaib carlo carboni Mohammed Elias Molla Samiya Al-Mahrezi Turkiya Al-Shahumi Sanaa Al-Badi Muna Al-Farsi Department of Chemistry Sultan Qaboos University Al-Khod Sultanate of Oman Department of Physics Sultan Qaboos University Al-Khod Sultanate of Oman Department of Chemistry Jahangirnagar University Dhaka Bangladesh

The mesogenic properties of a homologous series of aromatic ester materials are investigated. Single tail and double tail materials were synthesized to compare with other series we prepared and published earlier. The phase sequences and transition temperatures were obtained by polarized light microscopy and differential scanning calorimetry. Only the single tail materials with the ester attached to naphthalene at position 2 display mesogenicbehavior. Two materials (ZH 29 & ZH 32) possess a monophasic nematic phase and another two materials (ZH 14 & ZH 35) display biphasic nematic and smectic (A) phases.

关键词： Liquid Crystals Mesomorphism Calamitic Nematic Smectic A Polarized Optical Microscopy Differential Scanning Calorimetry

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