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First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach

หน่วยงาน Universiti Sains Malaysia, Malaysia

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ชื่อเรื่อง : First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach
นักวิจัย : Fun, Hoong Kun , Chantrapromma, Suchada , Ong, Lye Hock
คำค้น : QC1-999 Physics
หน่วยงาน : Universiti Sains Malaysia, Malaysia
ผู้ร่วมงาน : -
ปีพิมพ์ : 2557
อ้างอิง : http://eprints.usm.my/39132/1/First_Order_Temperature_Dependent_Phase_Transition_in_a_Monoclinic.pdf , Fun, Hoong Kun and Chantrapromma, Suchada and Ong, Lye Hock (2014) First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach. Molecules, 19 (7). pp. 10137-10149. ISSN 1420-3049
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : https://doi.org/10.3390/molecules190710137 , http://eprints.usm.my/39132/
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Crystals of 1,6-hexanedioic acid (I) undergo a temperature-dependent reversible phase transition from monoclinic P21/c at a temperature higher than the critical temperature (Tc) 130 K to another monoclinic P21/c at temperature lower than Tc. The phase transition is of first order, involving a discontinuity and a tripling of the b-axis at Tc whereas the other unit cell parameters vary continuously. The transition is described by the phenomenological Landau theory. The crystal structure analyses for data collected at 297(2) K and 120.0(1) K show that there is half of a molecule of (I) in the asymmetric unit at 297(2) K whereas there are one and a half molecules of (I) in the asymmetric unit at 120.0(1) K. At both temperatures, 297(2) and 120.0(1) K, intermolecular O-H···O hydrogen bonds link the molecules of I into infinite 1D chains along [101] direction. However there are significantly more O-H···O hydrogen bonds presented in the 120.0(1) K polymorph, thereby indicating this phase transition is negotiated via hydrogen bonds. The relationship of the conformational changes and hydrogen bonding for these two polymorphs are explained in detail.

บรรณานุกรม :
Fun, Hoong Kun , Chantrapromma, Suchada , Ong, Lye Hock . (2557). First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach.
    กรุงเทพมหานคร : Universiti Sains Malaysia, Malaysia.
Fun, Hoong Kun , Chantrapromma, Suchada , Ong, Lye Hock . 2557. "First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach".
    กรุงเทพมหานคร : Universiti Sains Malaysia, Malaysia.
Fun, Hoong Kun , Chantrapromma, Suchada , Ong, Lye Hock . "First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach."
    กรุงเทพมหานคร : Universiti Sains Malaysia, Malaysia, 2557. Print.
Fun, Hoong Kun , Chantrapromma, Suchada , Ong, Lye Hock . First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach. กรุงเทพมหานคร : Universiti Sains Malaysia, Malaysia; 2557.