3576-88-3Relevant articles and documents
Ammelinium Sulfate Monohydrate and Ammelinium Sulfate Cyanuric Acid – Synthesis and Structural Characterization
Kessler, Fabian K.,Schnick, Wolfgang
, p. 848 - 856 (2019)
Two ionic carbon nitride type compounds containing the ammelinium cation, ammelinium sulfate cyanuric acid (6C3N5H6O+·3SO4 2–·1?C3N3H3O3·H2O) (1) and ammelinium sulfate monohydrate (2C3N5H6O+·SO4 2–·H2O) (2) were synthesized through hydrolysis of melam (C6N11H9) in diluted sulfuric acid. 1 crystallizes in hexagonal space group P63 (no. 173) with lattice parameters of a = 14.642(3), c = 13.113(4), and Z = 2. The structure is comprised of protonated ammelinium ions and neutral cyanuric acid molecules, which form a layered structure, as well as sulfate ions that span through these layers. 2 crystallizes in the triclinic space group P1 with lattice parameters of a = 7.404(3), b = 9.673(4), c = 10.040(4), α = 91.098(15), β = 109.884(10), γ = 92.567(13), and Z = 2. As for 1, the ammelinium rings form layers with the sulfate ions located in between. In both structures, no extended hydrogen bond networks between the respective triazine-based molecules are formed. Instead, single molecules or small building blocks occur isolated and interact primarily with sulfate anions. Compound 1, which was obtained phase pure, was further investigated by FTIR spectroscopy, solid-state NMR spectroscopy and powder X-ray diffractometry.
Formation and characterization of melam, melam hydrate, and a melam-melem adduct
Wirnhier, Eva,Mesch, Maria B.,Senker, Juergen,Schnick, Wolfgang
, p. 2041 - 2049 (2013)
Until recently, melam, [C3N3(NH2) 2]2NH, has been regarded as a short-lived intermediate in the condensation process of melamine that is only detectable under special reaction conditions owing to its high reactivity. A new synthetic approach has allowed a closer look at the formation and condensation behavior of melam by using elevated ammonia pressure in autoclaves. Whereas the thermal treatment of dicyandiamide at 450 °C and 0.2 MPa ammonia yielded melam in large amounts, prolonged treatment under these conditions (9 days) led to the formation of a melam-melem adduct, thus enabling the first insight into the condensation process of melam into melem. The hydrothermal treatment of melam at 300 °C (24 h) yields melam hydrate, [C3N3(NH2) 2]2NH×2 H2O (space group P2 1/c; a=676.84(2), b=1220.28(4), c=1394.24(4) pm; β=98.372(2) °; V=1139.28(6)×106 pm3; Z=4), which crystallizes as a layered structure that is composed of almost-planar melam molecules, thereby forming ellipsoidal rosette-like motifs. The resulting voids are filled with four water molecules, thus forming a dense network of hydrogen bonds. Copyright
Novel carbon nitride composites with improved visible light absorption synthesized in ZnCl2-based salt melts
Fettkenhauer, Christian,Weber, Jens,Antonietti, Markus,Dontsova, Dariya
, p. 40803 - 40811 (2015/02/19)
Poly(triazine imide)-based carbon nitride materials with BET surface areas up to 200 m2g-1were synthesized in ZnCl2containing salt melts without the use of hard templates. We found that the composition, structural order, optical properties and morphology of the products can be adjusted by careful selection of synthesis parameters. The nature of the salt eutectic and precursor concentration in the melt have an especially large influence, with ZnCl2being a reactive solvent. This novel synthesis route provides access to easily processable materials with improved optical absorption in the visible range that can be used as composite photocatalysts, CO2adsorbents or nanocomposite fillers. This journal is
