scholarly journals Frontispiece: Hydrogen‐Bonded Crystalline Molecular Machines with Ultrafast Rotation and Displacive Phase Transitions

2020 ◽  
Vol 26 (51) ◽  
Author(s):  
Abraham Colin‐Molina ◽  
Marcus J. Jellen ◽  
Joelis Rodríguez‐Hernández ◽  
Miguel Eduardo Cifuentes‐Quintal ◽  
Jorge Barroso ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Molecular Machines ◽  
Hydrogen Bonded

scholarly journals Hydrogen‐Bonded Crystalline Molecular Machines with Ultrafast Rotation and Displacive Phase Transitions

2020 ◽  
Vol 26 (51) ◽  
pp. 11727-11733 ◽  
Author(s):  
Abraham Colin‐Molina ◽  
Marcus J. Jellen ◽  
Joelis Rodríguez‐Hernández ◽  
Miguel Eduardo Cifuentes‐Quintal ◽  
Jorge Barroso ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Molecular Machines ◽  
Hydrogen Bonded

Role of crystallization water molecules on hydrogen-bonded structures and dielectric phase transitions in amino trimethylene phosphonic acid-based crystals

2017 ◽  
Vol 41 (12) ◽  
pp. 5142-5150 ◽  
Author(s):  
Yu-Ling Sun ◽  
Bei-Bei Zheng ◽  
Wen Zhang
Keyword(s):  
Phase Transitions ◽  
Water Molecule ◽  
Phosphonic Acid ◽  
Water Molecules ◽  
Crystallization Water Molecule ◽  
Crystallization Water ◽  
Organic Salts ◽  
Dielectric Phase ◽  
Hydrogen Bonded

Amino trimethylene phosphonic acid-based organic salts show crystallization water molecule-triggered dielectric transitions and relaxations.

Phase transitions in hydrogen-bonded phenol–amine adducts: analysis by ferroelastic theory

2003 ◽  
Vol 127 (9-10) ◽  
pp. 677-682 ◽  
Author(s):  
H.-K. Fun ◽  
A. Usman ◽  
S. Chantrapromma ◽  
J. Osman ◽  
L.-H. Ong ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Amine Adducts ◽  
Hydrogen Bonded

Phase Transitions in Some Hydrogen-Bonded Molecules

2002 ◽  
Vol 191 (1) ◽  
pp. 49-57 ◽  
Author(s):  
M.M. Abdel-Kader ◽  
S.E. Gwaily ◽  
M.Y. El Zayat
Keyword(s):  
Phase Transitions ◽  
Hydrogen Bonded

scholarly journals Formamidinium iodide: crystal structure and phase transitions

2017 ◽  
Vol 73 (4) ◽  
pp. 569-572 ◽  
Author(s):  
Andrey A. Petrov ◽  
Eugene A. Goodilin ◽  
Alexey B. Tarasov ◽  
Vladimir A. Lazarenko ◽  
Pavel V. Dorovatovskii ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Transitions ◽  
Powder Diffraction ◽  
Solid Phase ◽  
Monoclinic Space Group ◽  
Scanning Calorimetry ◽  
Polymorphic Modifications ◽  
Different Temperatures ◽  
Physicochemical Methods ◽  
Hydrogen Bonded

At a temperature of 100 K, CH5N2+·I−(I), crystallizes in the monoclinic space groupP21/c. The formamidinium cation adopts a planar symmetrical structure [the r.m.s. deviation is 0.002 Å, and the C—N bond lengths are 1.301 (7) and 1.309 (8) Å]. The iodide anion does not lie within the cation plane, but deviates from it by 0.643 (10) Å. The cation and anion ofIform a tight ionic pair by a strong N—H...I hydrogen bond. In the crystal ofI, the tight ionic pairs form hydrogen-bonded zigzag-like chains propagating toward [20-1]viastrong N—H...I hydrogen bonds. The hydrogen-bonded chains are further packed in stacks along [100]. The thermal behaviour ofIwas studied by different physicochemical methods (thermogravimetry, differential scanning calorimetry and powder diffraction). Differential scanning calorimetry revealed three narrow endothermic peaks at 346, 387 and 525 K, and one broad endothermic peak at ∼605 K. The first and second peaks are related to solid–solid phase transitions, while the third and fourth peaks are attributed to the melting and decomposition ofI. The enthalpies of the phase transitions at 346 and 387 K are estimated as 2.60 and 2.75 kJ mol−1, respectively. The X-ray powder diffraction data collected at different temperatures indicate the existence ofIas the monoclinic (100–346 K), orthorhombic (346–387 K) and cubic (387–525 K) polymorphic modifications.

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