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Melamium Thiocyanate Melam, a Melamium Salt with Disordered Anion Sites
Author(s) -
Kessler Fabian K.,
Schuhbeck Alexander M.,
Schnick Wolfgang
Publication year - 2019
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201900054
Subject(s) - thiocyanate , monoclinic crystal system , ammonium thiocyanate , crystallography , adduct , crystal structure , chemistry , rietveld refinement , ion , hydrogen bond , powder diffraction , thermal analysis , inorganic chemistry , molecule , organic chemistry , physics , thermal , meteorology
Melamium salts are a group of ionic carbon nitride type compounds that has been investigated only scarcely. We herein present a novel representative of this group. A melamium thiocyanate melam (1:1) adduct was synthesized from dicyandiamide and ammonium thiocyanate in sealed glass ampoules. The structure of the adduct was determined from single‐crystal X‐ray diffraction. Melamium thiocyanate melam crystallizes in monoclinic space group P 2 1 / c (no. 14) with lattice parameters of a = 3.6041(11), b = 28.532(7), c = 10.937(4) Å, β = 99.051(14)°, and Z = 4. While the melamium ions form 2D extended hydrogen bridged networks, the thiocyanate ions are disordered and no distinct structural sites could be assigned to the respective atoms. Instead, continuous columns of electron density located in channels in the porous structure were identified as potential space for anion locations. The compound was further characterized by elemental analysis, FTIR spectroscopy and solid‐state MAS‐NMR spectroscopy of the nuclei 1 H, 13 C and 15 N. Rietveld refinement of powder samples was performed for phase analysis. Furthermore, DSC‐TG was used to investigate the thermal behavior of the compound.