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Martin, Thomas ; Greim, Dominik ; Milius, Wolfgang ; Niedermaier, Michael ; Ludescher, Beate ; von Wegerer, Jörg ; Brysch, Wolfgang ; Bärwinkel, Kilian ; Senker, Jürgen ; Breu, Josef:
The Same at a First Glance : the Diffractogram of a New Polymorph of Anhydrous Sodium Luminolate Almost Perfectly Resembles the Diffraction Trace of an Already Known Polymorph.
In: Zeitschrift für anorganische und allgemeine Chemie.
Bd. 641
(2015)
Heft 2
.
- S. 332-338.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201400604
Abstract
A so far unknown third polymorph (form III) of 5-amino-2,3-dihydro-1,4-phthalazinedione (luminolate) monosodium salt could be isolated phase pure and its structure was determined by powder X-ray diffraction and Rietveld refinement cell parameters: a = 8.0364(2)angstrom, b = 3.69765(5)angstrom, c = 26.4246(7)angstrom, beta = 96.346(2)degrees, V = 780.42(3)angstrom(3), space group P21/c]. The new structure shows many similarities to the structure of the known form II and the consequently slim differences in the diffraction traces could have easily been over-looked. Slurry experiments prove the new form to be more stable than form II. Both form II and form III crystallize in a lamellar structure. The layers are in turn built by shifted pi-stacked strands of hydrogen bonded luminolate dimers. The strands are canted by +/- 25 degrees in respect to the layers. While in form II the tilt direction alternates from strand to strand within a single layer, in form III all strands within a layer are tilted in the same direction and the orientation rather alternates between adjacent layers.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Crystal engineering; Polymorphism; X-ray diffraction; Structure elucidation; Thermodynamics |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie III > Lehrstuhl Anorganische Chemie III - Univ.-Prof. Dr. Jürgen Senker Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie III |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 26 Jul 2016 12:31 |
| Letzte Änderung: | 05 Apr 2023 13:18 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/33645 |