TY - JOUR A1 - Gnutzmann, Tanja A1 - Rademann, K. A1 - Emmerling, Franziska T1 - Fast crystallization of organic glass formers N2 - An unusually fast crystallization of the organic glass former nifedipine has been observed. The crystallization process, starting from an amorphous film to crystalline material, was investigated by time resolved Raman microspectroscopy. The crystallization rates of the initially crystallizing metastable β-form are four orders of magnitude higher than those of previous studies. KW - Polymorphism KW - Raman spectroscopy KW - Crystallization KW - Nifedipine PY - 2012 U6 - https://doi.org/10.1039/c1cc16301a SN - 0022-4936 SN - 0009-241x SN - 1359-7345 SN - 1364-548x VL - 48 SP - 1638 EP - 1640 PB - Royal Society of Chemistry CY - Cambridge AN - OPUS4-27735 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Emmerling, Franziska A1 - Orgzall, I. A1 - Dietzel, B. A1 - Schulz, B. A1 - Larrucea, J. T1 - Ordering the amorphous - Structures in PBD LED materials N2 - The class of 2,5 disubstituted-1,3,4-oxadiazoles containing a biphenyl unit on one side is intensively used as electron transport materials to enhance the performance of organic light emitting diodes (OLEDs). In contrast to the ongoing research on these materials insights in their structure-property relationships are still incomplete. To overcome the structural tentativeness and ambiguities the crystal structures of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole, that of the related compound 2-(4-biphenylyl)-5-phenyl-1,3,4-oxadiazole and of 2-(4-biphenylyl)-5-(2,6-dimethylphenyl)-1,3,4-oxadiazole are determined. A comparison with the results of GAUSSIAN03 calculations and similar compounds in the Cambridge Structural Database leads to a profound characterization. KW - OLED KW - PBD KW - Diphenyl-1,3,4-oxadiazole KW - Crystallization PY - 2012 U6 - https://doi.org/10.1016/j.molstruc.2012.04.040 SN - 0022-2860 SN - 1872-8014 SN - 0377-046X VL - 1030 SP - 209 EP - 215 PB - Elsevier CY - Amsterdam AN - OPUS4-27264 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -