A Systematic Approach to Alkali Biuretooxophosphates

作者：Wirnhier Eva; Schnick Wolfgang^*

来源：European Journal of Inorganic Chemistry, 2012, (11): 1840-1847.

DOI：10.1002/ejic.201101317

• Structure elucidation
• Biureto-oxophosphates
• Photoluminescence spectroscopy
• Alkali metals

Biuretooxophosphates represent a link between carbon nitride and phosphorus (oxo)nitride precursor chemistry being closely related to cyanurates and trimetaphosphimates. The group of alkali biuretooxophosphates has been complemented by the synthesis of four salts M[PO2(NH)3(CO)2]center dot xH2O in which M = Li, K, Rb, and Cs (x = 1, 0, 0.5, 0, respectively). The structures were solved by single-crystal X-ray diffraction and compared with the corresponding ammonium and sodium salts. For all of the salts, the 1-phospha-2,4,6-s-triazine ring exhibits a nearly planar conformation with the phosphorus atom being slightly deflected. In the sequence Li to Cs, the crystal structures show a significant change in orientation leading from a parallel to a perpendicular arrangement of the rings, the latter being bridged by NH...O bonds. The thermal behavior of the biuretooxophosphates was examined by means of temperature-dependent powder X-ray diffraction measurements and combined thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Moreover, the FTIR and photoluminescence spectra of the salts are discussed.

• 出版日期2012-4