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1.
Acta Crystallogr A Found Adv ; 80(Pt 1): 137-138, 2024 Jan 01.
Article in English | MEDLINE | ID: mdl-38063354

ABSTRACT

Obituary for Professor Dr Hendrik (Henk) Schenk.

2.
Acta Crystallogr C Struct Chem ; 74(Pt 3): 392-399, 2018 Mar 01.
Article in English | MEDLINE | ID: mdl-29504571

ABSTRACT

Paracetamol [N-(4-hydroxyphenyl)acetamide, C8H9NO2] has several polymorphs, just like many other drugs. The most stable polymorphs, denoted Forms I and II, can be obtained easily and their crystal structures are known. Crystals of the orthorhombic, less stable, room-temperature Form III are difficult to grow; they need a special recipe to crystallize and suffer from severe preferred orientation. A crystal structure model of Form III has been proposed and solved from a combination of structure prediction and powder X-ray diffraction (PXRD) [Perrin et al. (2009). Chem. Commun. 22, 3181-3183]. The final Rwp value of 0.138 and the corresponding considerable residual trace were reasons to check its validity. A new structure determination of Form III using new high-resolution PXRD data led to a final Rwp value of 0.042 and an improvement of the earlier proposed model. In addition, a reversible phase transition was found at 170-220 K between the orthorhombic Form III and a novel monoclinic Form III-m. The crystal structure of Form III-m has been determined and refined from PXRD data to a final Rwp value of 0.059.


Subject(s)
Acetaminophen/chemistry , Crystallography, X-Ray , Hydrogen Bonding , Phase Transition , Powder Diffraction , Temperature , X-Ray Diffraction
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