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Hausner, Josef ; Butterhof, Christian ; Martin, Thomas ; Milius, Wolfgang ; Breu, Josef:
Tris(2,4,6-triamino-1,3,5-triazin-1-ium) Dihydrogenphosphate Monohydrogenphosphate Tetrahydrate.
In: Zeitschrift für anorganische und allgemeine Chemie.
Bd. 640
(2014)
Heft 14
.
- S. 2871-2875.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201400391
Abstract
When "recrystallizing" the commercial flame retardant melaminium orthophosphate, surprisingly a hydrate with a diverging stoichiometry of melaminium (M) and phosphate (P) was obtained (M3P2·4H2O). The structure of M3P2·4H2O was solved by single-crystal X-ray diffraction analysis. The arrangement of positive melaminium and negative phosphate layers found in the crystal structure allows for both electrostatic attraction and hydrogen bonding networks. The melaminium layers are comprised of hydrogen-bonded ribbons of melaminium, which in turn are connected by π–π interactions into layers. The negatively charged phosphate layers are comprised of hydrogen bonded dihydrogenphosphate dimers and hydrogenphosphate dimers, which in turn are interconnected by direct and water-mediated hydrogen bonding into layers.