cg0506572_si_003.avi (621.04 MB)
Polymorphism in 4-Methoxy-3-nitrobenzaldehyde
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posted on 2006-06-07, 00:00 authored by Sara Wishkerman, Joel Bernstein, Peter W. StephensTwo of the three earlier reported polymorphic forms of 4-methoxy-3-nitrobenzaldehyde have been reinvestigated
and fully characterized by a variety of methods including variable temperature powder X-ray diffraction, vibrational spectroscopy
(infrared and Raman), calorimetry (differential scanning calorimetry, DSC), and optical microscopy. Differences of DSC thermograms,
which were carried out with different cooling rates, suggest a thermodynamic/kinetic competition in the crystallization from the
melt. The crystal structures of these two forms have been solved, one by single-crystal methods and the second from synchrotron
powder diffraction.