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Sulfamerazine: Understanding the influence of slip planes in the polymorphic phase transformation through X-ray crystallographic studies and ab initio lattice dynamics
(American Chemical Society, 2015-08-28)
Understanding the polymorphism exhibited by organic active-pharmaceutical ingredients (APIs), in particular the relationships between crystal structure and the thermodynamics of polymorph stability, is vital for the ...
Effects of ball-milling and cryomilling on sulfamerazine polymorphs: A quantitative study
(Elsevier, 2014-04-11)
The effects of ball-milling and cryomilling on sulfamerazine forms I and II (SMZ FI, FII) were investigated using X-ray powder diffraction, infrared and near-infrared (NIR) spectroscopy. Cryomilling resulted in a complete ...
Hydrogen bonding networks and solid-state conversions in benzamidinium salts
(2015-07-14)
Ten benzamidinium salts of carboxylic acids, amides, and sulfonamides have been crystallized from solution. Single-crystal X-ray analyses revealed various hydrogen bonding motifs which ate discussed in terms of supramolecular ...
Crystallization of organic salts from the gas phase: When does proton transfer take place?
(American Chemical Society, 2020-12-13)
Salt formation with proton transfer is observed in crystals grown by cosublimation of the salt coformers. Diflunisal salts were obtained with 4-[3-(pyridin-4-yl)propyl]pyridine, piperazine, and 4-dimethylaminopyridine. ...
Salts, binary and ternary cocrystals of pyrimethamine: mechanosynthesis, solution crystallization and crystallization from the gas phase
(American Chemical Society, 2020-11-24)
A series of salts and binary and ternary cocrystals of the antimalaria drug pyrimethamine (PYR) are reported. PYR has a donor–acceptor–donor (DAD) and a donor–acceptor (DA) binding site, and cocrystallization experiments ...
Manipulating cocrystal size and morphology using a combination of temperature cycling and additives
(American Chemical Society, 2020-11-20)
A cooling crystallization of benzoic acid and isonicotinamide in ethanol yields the 1:1 cocrystal with an extreme needle-like morphology with an initial mean aspect ratio of ∼10 and a size of ∼64 μm. We demonstrate that ...