Abstract
Thermogravimetric and Differential Scanning Calorimetric investigation of the thermal behaviour of NH4+, Na+, Zn2+, Cd2+ e Pb2+ dithiocarbamates obtained from cyclic amines, is described under nitrogen and air atmospheres in order to investigate the effect of a cyclic ring on the mechanism of decomposition. Intermediates were identified by X-ray Diffraction analysis. Zn2+, Cd2+ e Pb2+ oxysulphates were detected under air atmosphere suggesting the thermal decomposition under these conditions as an alternating synthetic route to prepare those compounds. The final decomposition products were the metallic sulphides under N2 atmosphere while transition metal oxides and sodium sulphate were obtained under air. Melting enthalpies are also reported from DSC data.
Highlights
IntroductionDithiocarbamates (DTC), are products of a reaction of a primary or secondary amines with carbon disulphide, and has been described in several applications such as medicine, industry, agriculture and chemistry, that are commented in several reviews[1,2,3,4,5,6,7,8,9]
In three reviews about the thermal behaviour of DTC compounds[1,2,4], most of references are related with the aliphatic derivatives in which a decomposition mechanism involving metallic thiocyanate as the main intermediate
Few studies has been presented in relation to the cyclic DTC, such as pyrrolidinedithiocarbamate (Pyr) and
Summary
Dithiocarbamates (DTC), are products of a reaction of a primary or secondary amines with carbon disulphide, and has been described in several applications such as medicine, industry, agriculture and chemistry, that are commented in several reviews[1,2,3,4,5,6,7,8,9] In those reviews is possible to note that the knowledge of DTC thermal behaviour and information about their stability and decomposition residues, are important data and can show synthetic routes for unusual compounds. In the present work the thermal behaviour of ammonium, sodium, zinc, cadmium and lead complexes with Pyr and Pip under nitrogen and air atmospheres was investigated with the purpose of evaluating the influence of the different angular tension of the 5 and 6 members aminic rings on the decomposition and identify the intermediates formed
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