Abstract
Identification and monitoring of gaseous species released during thermal decomposition of title compound 1, Sn 2(tu) 5Cl 4·2H 2O (tu stands for thiourea (NH 2) 2C S)) in flowing air atmosphere have been carried out up to 600 °C by both online coupled TG-EGA-FTIR and simultaneous TG/DTA-EGA-MS apparatuses. The first gaseous products of the dehydrated 1, evolved around 190 °C, are carbonyl sulphide (COS), carbon disulfide (CS 2), and cyanamide (NH 2CN). At 240 °C isothiocyanic acid, HNCS becomes the main product, accompanied by CS 2, ammonia (NH 3), a small amount of hydrogen cyanide (HCN) and traces of hydrogen chloride (HCl), according to EGA-FTIR spectroscopic analysis. At 250 °C formation of sulphur dioxide (SO 2) has been observed by EGA-mass spectrometry. SO 2 as air oxidation product of tin sulphides, formed in the previous stages, occurs also around 430 °C, while gaseous oxidation products of the organic residues, such as CO 2 and NH 2CN are released at 515 °C. Both oxidation processes are accompanied by an exothermic heat effect. All species identified by FTIR gas cell are also confirmed by mass spectrometry, except HNCS.
Sign-in/Register to access full text options 
Free) 
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 call
