Abstract
The amidosulfonates of Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ were prepared by the direct reaction between the metal carbonate and the amidosulfonic acid with heating and stirring. The compounds were characterized by infrared absorption spectroscopy (IRFT), elemental analysis, thermal analysis (TG and DTA) and X-ray diffraction by the powder method. The absorptions observed in IR spectra are associated with N-H and O-H stretching, as well as symmetrical and asymmetric S-O stretching in the sulfonic group. The compounds present X-ray diffraction pattern with well-defined reflections, showing no evidence of isomorphism. The TG-DTA curves allowed to establish the stoichiometry of compounds as M(NH2SO3)2.xH2O, where M = Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ and x ranging from 1 to 4. Dehydration leads to the formation of stable anhydrous. In all cases the respective sulfates are formed as an intermediate. After consecutive steps of decomposition, the respective oxides were obtained: Mn3O4, CoO, NiO, CuO and ZnO. The TG-DTA curves are characteristic for each sample, with thermal events related to dehydration and ligand decomposition.
Highlights
The amidosulfonic acid or sulfamic acid (NH2SO3H) has molar mass 97.10 g mol-1
The TG-differential thermal analysis (DTA) curves allowed to establish the stoichiometry of compounds as M(NH2SO3)2.xH2O, where M = Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ and x ranging from 1 to 4
The elemental analysis results are presented in Tab. 1 and are in agreement with the proposed general formula M(NH2SO3)2.xH2O, where M =
Summary
The amidosulfonic acid or sulfamic acid (NH2SO3H) has molar mass 97.10 g mol-1 When dry it is stable, but in solution, it is hydrolyzed, forming ammonium bisulfate. It is relatively soluble in water, moderately soluble in alcohol, poorly soluble in acetone, insoluble in ether and very soluble in nitrogenous bases, liquid ammonia, pyridine, formamide and dimethylformamide. In recent years sulfamic acid has been used as an efficient heterogeneous catalyst in a series of organic reactions, such as acetylation, esterification, condensation, transesterification, among others[2] It is a ZWITTERION, in other words, a dipolar ion having opposite charges on different atoms. In the formation of metal complexes, both amine and sulfonate groups participate in the coordination with the metal ion
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
