Temperature-Dependent Phase Transition Studies Of Multicomponent Crystals Of Hexamethylenetetramine And Isonicotinamide

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dc.contributor.authorChia, Tze Shyang
dc.date.accessioned2019-04-19T07:33:59Z
dc.date.available2019-04-19T07:33:59Z
dc.date.issued2018-07
dc.description.abstractIn this research, thirty-one multi-component crystals of hexamethylenetetramine and isonicotinamide were successfully prepared and seven of them undergo temperature-dependent phase transitions, which were investigated by using variable-temperature single-crystal X-ray diffraction analysis. These seven multi-component crystals are hexamethylenetetramine‒2-methylbenzoic acid (1/2) (monoclinic P21/c ↔ orthorhombic Pccn, Tc = 164.5 (5) K), hexamethylenetetramine‒benzoic acid (1/2) (monoclinic Pn ↔ orthorhombic Fmm2, Tc = 257.5 (5) K), hexamethylenetetramine‒4-methylbenzoic acid (1/2) (monoclinic P21/n ↔ orthorhombic Cmcm, Tc = 265.5 (5) K), hexamethylenetetramine‒succinic acid (1/1) (monoclinic P21/n ↔ monoclinic P21/c, Tc = 219 (1) K), hexamethylenetetramine‒adipic acid (1/1) (monoclinic P21 ↔ monoclinic P2/n ↔ orthorhombic Pna21 ↔ orthorhombic Pbcn ↔ orthorhombic Cmcm, Tc,1 = 202 (2) K, Tc,2 = 249 (2) K, Tc,3 = 258 (2) K, Tc,4 = 293 (2) K), isonicotinamide‒4- methoxybenzoic acid (1/1) (monoclinic I2/a ↔ monoclinic I2/a, Tc = 142.5 (5) K) and isonicotinamide‒malonic acid (2/1) (triclinic P1􀴤 ↔ monoclinic C2/c, Tc = 295 (1) K). These non-ambient crystallography studies were carried out to study the structural changes of multi-component crystals between different phases from 100 to 300 K. The structural phase transitions of hexamethylenetetramine‒2-methylbenzoic acid (1/2), hexamethylenetetramine‒benzoic acid (1/2), hexamethylenetetramine‒4- methylbenzoic acid (1/2), hexamethylenetetramine‒succinic acid (1/1) and hexamethylenetetramine‒adipic acid (1/1) are associated with the structural orderdisorder transformations as a function of temperature in their crystal structures.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/8056
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectTemperature-dependent phase transitionen_US
dc.subjectof hexamethylenetetramine And isonicotinamideen_US
dc.titleTemperature-Dependent Phase Transition Studies Of Multicomponent Crystals Of Hexamethylenetetramine And Isonicotinamideen_US
dc.typeThesisen_US
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