title: Infrared absorption bands from NCO- and NCN2- in heated carbonate-containing apatites prepared in the presence of NH4+ ions.
abstract: Infrared bands at about 2200 and 2010 cm-1 in the spectra of heated synthetic and biological CO3Aps are assigned to cyanate and cyanamide ions respectively. The formation of these ions is associated with the presence of nitrogenous species in the unheated materials.
mesh_terms: D001031:Apatites; D002254:Carbonates; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003484:Cyanamide / Q000032:analysis*; D003485:Cyanates / Q000032:analysis*; D003486:Cyanides / Q000032:analysis*; D010710:Phosphates; D000644:Quaternary Ammonium Compounds; D013055:Spectrophotometry, Infrared
chemical_list: D001031:Apatites; D002254:Carbonates; D003485:Cyanates; D003486:Cyanides; D010710:Phosphates; D000644:Quaternary Ammonium Compounds; D003484:Cyanamide