Abstract
The solid state deamination reactions of (+) 589-[Cr(en) 3](NCS) 3 and (±)-[Cr(en) 3](NCS) 3·H 2O have been investigated by DTA, TG and isothermal techniques. The rates of thermal deamination and apparent racemization reactions of (+) 589-[Cr(en) 3](NCS) 3 were determined at selected temperatures, and the activation energies of these reactions, 27 kcal/mol (deamination reaction) and 24 kcal/mol (racemization reaction), were obtained from these Arrhenius plots. The racemization was mainly accompanied with the deamination process. After the deamination reactions finished at 132°C for 7 hr (optically active complex) and 130°C for 7 hr (racemic complex), both yellow optically active- and racemic-complexes changed to orange powders and then for both deamination products the formation of trans-[Cr(en) 2(NCS) 2](NCS) was conclusively demonstrated by the chromatographic evidence. The mutual relation of the thermal behavior and the crystal structure in this system has also been discussed by comparison with present thermal data and our previous X-ray result of (+) 589-[Cr(en) 3](NCS) 3 crystal.
Published Version
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