Research output: Contribution to journal › Article › peer-review
Cooling rate “window” in the crystallization of metacetamol form II. / Drebushchak, V. A.; McGregor, L.; Rychkov, D. A.
In: Journal of Thermal Analysis and Calorimetry, Vol. 127, No. 2, 01.02.2017, p. 1807-1814.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Cooling rate “window” in the crystallization of metacetamol form II
AU - Drebushchak, V. A.
AU - McGregor, L.
AU - Rychkov, D. A.
N1 - Publisher Copyright: © 2016, Akadémiai Kiadó, Budapest, Hungary.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - Melting and crystallization of metacetamol (C8H9NO2, N-(3-hydroxyphenyl)acetamide, structural isomer of paracetamol) were measured using DSC cycling heating–cooling between room temperature and 165 °C with constant heating rate of 6 °C min−1 and variable cooling rate ranging from 3 to 24 °C min−1. The selection of the cooling rate allows us to control the crystallization of metacetamol into one of its two polymorphs, I or II. Pure form II of metacetamol (recently discovered) is crystallized after the cooling rate of 6 °C min−1. Increase or decrease in the cooling rate suppresses the crystallization of the form II and produces the form I with remnant amorphous phase and a small impurity of the form II. The melting points and enthalpies of fusion are 420 K and 26.0 ± 1.3 kJ mol−1 for the form I and 399 K and 21.3 ± 1.1 kJ mol−1 for the form II, respectively.
AB - Melting and crystallization of metacetamol (C8H9NO2, N-(3-hydroxyphenyl)acetamide, structural isomer of paracetamol) were measured using DSC cycling heating–cooling between room temperature and 165 °C with constant heating rate of 6 °C min−1 and variable cooling rate ranging from 3 to 24 °C min−1. The selection of the cooling rate allows us to control the crystallization of metacetamol into one of its two polymorphs, I or II. Pure form II of metacetamol (recently discovered) is crystallized after the cooling rate of 6 °C min−1. Increase or decrease in the cooling rate suppresses the crystallization of the form II and produces the form I with remnant amorphous phase and a small impurity of the form II. The melting points and enthalpies of fusion are 420 K and 26.0 ± 1.3 kJ mol−1 for the form I and 399 K and 21.3 ± 1.1 kJ mol−1 for the form II, respectively.
KW - Cooling rate
KW - DSC
KW - Metacetamol
KW - Polymorphism
KW - CALIBRATION
KW - PRESSURE
KW - GROWTH
KW - PARACETAMOL
KW - POLYMORPHISM
KW - NUCLEATION
UR - http://www.scopus.com/inward/record.url?scp=84996526161&partnerID=8YFLogxK
U2 - 10.1007/s10973-016-5954-0
DO - 10.1007/s10973-016-5954-0
M3 - Article
AN - SCOPUS:84996526161
VL - 127
SP - 1807
EP - 1814
JO - Journal of Thermal Analysis and Calorimetry
JF - Journal of Thermal Analysis and Calorimetry
SN - 1388-6150
IS - 2
ER -
ID: 9024935