at Google ScholarTitle data
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.
Vol. 641
(2015)
Issue 2
.
- pp. 332-338.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201400604
Abstract in another language
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.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Keywords: | Crystal engineering; Polymorphism; X-ray diffraction; Structure elucidation; Thermodynamics |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III > Chair Inorganic Chemistry III - Univ.-Prof. Dr. Jürgen Senker Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science > 540 Chemistry |
| Date Deposited: | 26 Jul 2016 12:31 |
| Last Modified: | 05 Apr 2023 13:18 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/33645 |