Lithium Melonate, Li3[C6N7(NCN)3].6H2O – Synthesis, Crystal Structure and Thermal Properties of a Novel Precursor for Graphitic Carbon Nitrides

Edwin Kroke (1) , Corinna Clauss (1) , Jörg Wagler (1) , Marcus Schwarz (1) , Anke Schwarzer (1)

1 Institut für Anorganische Chemie [Freiberg]

A new s-heptazine derivative, lithium melonate Li3[C6N7(NCN)3] (2), has been prepared from potassium melonate using an ion exchanger resin. The crystal structure of the hexahydrate Li3[C6N7(NCN)3].6H2O, 2a has been determined by X-ray diffraction analysis (hexagonal, P63/m, a = b = 12.2263(6), c = 6.8854(6) Å, V = 891.35(10) Å3). The results show that this s-heptazine derivative adopts ideal C3h symmetry, thus comprising 1/6 of the formula moiety in the asymmetric unit. 13C NMR data indicate that no melonate-lithium interaction occurs in solution, while Li is tetrahedrally coordinated by two O- and two N-atoms in 2a in the solid. The title compound 2 was further characterized by FTIR, Raman spectroscopy, TG/DTA and elemental analysis. In spite of the high nitrogen content 2 proved to be thermally stable up to ~500°C. The latter observation is typical for melonates and has been reported other s-heptazin derivatives as well.

Mots clés: Physical Sciences

Edwin Kroke, Corinna Clauss, Jörg Wagler, Marcus Schwarz, Anke Schwarzer. Lithium Melonate, Li3[C6N7(NCN)3].6H2O – Synthesis, Crystal Structure and Thermal Properties of a Novel Precursor for Graphitic Carbon Nitrides. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2009, 636 (1), pp.196. ⟨10.1002/zaac.200900326⟩. ⟨hal-00512212⟩