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30 Space-group corrections: two examples of false polymorphism and one of incorrect interpretation of the fine details of an IR spectrum

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Abstract:

Revised structures are reported for 30 crystalline compounds, based on space groups of higher symmetry than originally reported. In 18 cases the Laue class is revised, in seven cases the center of symmetry is added, in two cases the Laue class change is coupled with the addition of the center of symmetry, in two cases the addition of the center of symmetry also requires the addition of systematic absences and, finally, one case of the addition of systematic absences without changing the Laue group is reported. Two examples (CSD refcodes: DAMLIM and ABPZCU01) of false polymorphism and one (PAVJUR) of the erroneous interpretation of the fine details of IR spectra, owing to incorrect space-group determination, have been detected.

Keywords: IR spectra; false polymorphism; space-group corrections

Document Type: Research Article

DOI: http://dx.doi.org/10.1107/S0108768104006391

Publication date: June 1, 2004

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