TY - JOUR
T1 - Memory Effect and Crystallization of (R,S)-2-Chloromandelic Acid Glass
AU - Liu, Jie
AU - Liu, Guangfeng
AU - Song, Zijian
AU - Kaltenegger, Martin
AU - Silva de Moraes, Lygia
AU - Gopi, Elumalai
AU - Napolitano, Simone
AU - Geerts, Yves Henri
N1 - Funding Information:
G.L. thanks the European Union’s Horizon 2020 Research and Innovation Program under the Marie Sklodowska-Curie grant agreement no. 791207 (PARADA) and postdoctoral fellowship support from the FNRS for the POLYMOL project no. 1.B.253.20F. Y.H.G. is thankful to the Belgian National Fund for Scientific Research (FNRS) for financial support through research projects BTBT No 2.4565.11, Phasetrans No T.0058.14, and Pi-Fast No T.0072.18 and the financial support from ULB and the French Community of Belgian (ARC SADI No 20061). Y.H.G. also acknowledges the financial support from the FNRS and the Fonds voor Wetenschappelijk Onderzoek─Vlanderen (FWO) under the EOS project no.30489208. S.N. acknowledges financial support from the FNRS under Grant T.0184.20 EXOTICAGE. Z.S. thanks the China Scholarship Council (CSC) for a doctoral grant, no. 201807565008.
Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society
PY - 2021/12/9
Y1 - 2021/12/9
N2 - (R,S)-2-Chloromandelic acid, which can crystallize in racemic crystals (forms α and β) or a conglomerate (form γ), has been studied for its glass-forming behavior. Below the glass transition temperature, samples of the title compound crack into pieces. Correlation plots of DSC results have been used to investigate what determines the cracking and its occurrence temperature. We found that the latter is influenced by the polymorph from which the melt state has been obtained, showing that a certain memory of the previous crystalline phase persists in the undercooled melt. Moreover, this residual structure could be eliminated by elongating the annealing period or increasing the annealing temperature. Investigation using broadband dielectric spectroscopy confirmed such a memory effect. Finally, we studied the role of cracking in the control of the crystallization. In contrast with previous literature on other glass-forming molecular systems, we verified that the crystallization upon reheating is not impacted by the occurrence of cracks in the glassy state. This observation challenges the current views on polymorphic crystallization from organic glasses.
AB - (R,S)-2-Chloromandelic acid, which can crystallize in racemic crystals (forms α and β) or a conglomerate (form γ), has been studied for its glass-forming behavior. Below the glass transition temperature, samples of the title compound crack into pieces. Correlation plots of DSC results have been used to investigate what determines the cracking and its occurrence temperature. We found that the latter is influenced by the polymorph from which the melt state has been obtained, showing that a certain memory of the previous crystalline phase persists in the undercooled melt. Moreover, this residual structure could be eliminated by elongating the annealing period or increasing the annealing temperature. Investigation using broadband dielectric spectroscopy confirmed such a memory effect. Finally, we studied the role of cracking in the control of the crystallization. In contrast with previous literature on other glass-forming molecular systems, we verified that the crystallization upon reheating is not impacted by the occurrence of cracks in the glassy state. This observation challenges the current views on polymorphic crystallization from organic glasses.
UR - http://www.scopus.com/inward/record.url?scp=85120381594&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.1c07749
DO - 10.1021/acs.jpcb.1c07749
M3 - Article
C2 - 34808063
AN - SCOPUS:85120381594
SN - 1520-6106
VL - 125
SP - 13339
EP - 13347
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 48
ER -