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RESEARCH PRODUCT
Investigation of phthalocyanine crystals exposed to NO2 ambient gas
Rudolf SłotaW. WacławekGabriela Dyrdasubject
X-ray powder diffractometryMicroprobeScanning electron microscopePhthalocyaninesAnalytical chemistryInorganic ChemistryMetalCrystalchemistry.chemical_compoundAdsorptionchemistryvisual_artDesorptionMaterials Chemistryvisual_art.visual_art_mediumPhthalocyanineUV–Vis and FTIR spectroscopyPhysical and Theoretical ChemistryFourier transform infrared spectroscopyScanning electron microscopyX-ray microprobeNitrogen dioxidedescription
Crystals of free base phthalocyanine (H2pc) and its unsubstituted metal derivatives Mpc (where M=Ni, Cu, Zn, Pb, and pc=C32H16N8 2−=phthalocyanine ligand) were examined after being exposed to NO2 ambient gas. Scanning electron microscopy (SEM) supported by X-ray microprobe analysis (EDAX), UV–Vis and FTIR spectroscopy as well as X-ray powder diffractometry (XRD) were applied to study the crystals chemistry and surface morphology. The NO2 molecules were found to penetrate the crystal unit which led to the breakdown of the phthalocyanine macrocycle. The surface of the doped crystals has been scaled and covered by a layer composed predominantly of phthalimide. Despite vacuum desorption, it has been proved some free NO2 to be still adsorbed by the studied material. Surface of a crystal of H2pc, scaled due to the action of NO2 and covered by the reaction products is shown. Crystalline copper reactions, as determined by EDAX for Cupc crystals exposed to NO2 give evidence of the phthalocyanine macrocycle breakdown. FT-IR studies revealed phthalimide to be the main reaction product, and the phthalocyanine decay increases with the raise of temperature. Similarly this could be concluded from X-ray diffraction patterns.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-04-01 | Polyhedron |