Piela, Katarzyna published the artcilePolymorphism and cold crystallization in optically nonlinear N-benzyl-2-methyl-4-nitroaniline crystal studied by X-ray diffraction, calorimetry and Raman spectroscopy, Quality Control of 201157-13-3, the publication is Journal of Molecular Structure (2011), 991(1-3), 42-49, database is CAplus.
Polymorphism of N-benzyl-2-methyl-4-nitroaniline (BNA), a terahertz emitter and frequency doubler, was detected and the crystal structures of orthorhombic and monoclinic polymorphs have been determined at room temperature The differential scanning calorimetry (DSC) revealed monotropic phase transition of the monoclinic BNA crystal at 362 K and during re-heating, after the molten BNA cooling, the cold crystallization of both polymorphs. The variable-temperature Raman spectra in the 700-1700 cm-1 range evidenced the polymorphic transformation from the monoclinic to the orthorhombic structure, the latter stable in the wide temperature range. The comparison of the crystal structures, DSC curves, FT-IR and Raman spectra of the two polymorphs allowed the authors to recognize the N-H¡¤¡¤¡¤O hydrogen bond in the orthorhombic and C-H¡¤¡¤¡¤O hydrogen bond in the monoclinic one as well as other intermol. interactions. The role of dynamic disorder, intra- and intermol. charge transfers in the mol. mechanism of optical nonlinearity is discussed.
Journal of Molecular Structure published new progress about 201157-13-3. 201157-13-3 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is N-Benzyl-2-methyl-4-nitroaniline, and the molecular formula is C14H14N2O2, Quality Control of 201157-13-3.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia