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Concomitant polymorphism in the pseudo-peptide Me2N-pC6H4C(O)-Phe-OEt (CROSBI ID 188532)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Užarević, Krunoslav ; Kokan, Zoran ; Perić, Berislav ; Bregović, Nikola ; Kirin, Srećko I. Concomitant polymorphism in the pseudo-peptide Me2N-pC6H4C(O)-Phe-OEt // Journal of molecular structure, 1031 (2013), 160-167. doi: 10.1016/j.molstruc.2012.07.026

Podaci o odgovornosti

Užarević, Krunoslav ; Kokan, Zoran ; Perić, Berislav ; Bregović, Nikola ; Kirin, Srećko I.

engleski

Concomitant polymorphism in the pseudo-peptide Me2N-pC6H4C(O)-Phe-OEt

Pseudo-peptide Me2N-pC6H4C(O)-Phe-OEt (1) exhibits two polymorphic forms which crystallizes in non-centrosymmetric space groups, monoclinic 1m (P21) and orthorhombic 1o (P212121). Both forms occur concomitantly or as a pure phase depending on the solvent of crystallization. Single crystal X-ray diffraction revealed equivalent two-dimensional layers in both 1m and 1o, the different modes of layer stacking are caused by Csingle bondH⋯π interactions specific for each polymorph. Both solid forms are transparent in visible spectral region, with different absorbance patterns in lower UV region. Thermodynamic relations between two polymorphs were unambiguously established using room-temperature competitive slurry experiments, mechanochemistry and heating.

pseudo-peptide ; phenylalanine ; polymorphism ; crystal structure ; solid-state transformations ; mechanochemistry

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Podaci o izdanju

1031

2013.

160-167

objavljeno

0022-2860

1872-8014

10.1016/j.molstruc.2012.07.026

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Kemija

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