Potentiality and Kinetic Thermal Decomposition Studies of Optically Nonlinear Rhodium- Tetracyanoquinodimethan Adducts

DOI : http://dx.doi.org/10.13005/msri/050102

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Some nonlinear Rhodium- tetracyanoquinodimethan were synthesized from the reaction of different counters of Rhodium with tetracyanoquinodimethan. Chemical structure of the obtained products will be investigated and confirmed by using elemental analysis and spectroscopic techniques such as IR-, UV/Vis- and 1H-NMR spectroscopy. In addition, the molecular structure of the obtained products determined. Described synthetic condition results in a significant improvement in both yield and reaction time of Z- b -(1-substituted-4-pyridinium)-a-cyano-4-styryldicyanomethanide chromophores. A decomposition study of the zwitterionic chromophores in solution is also described. The non-isothermal decomposition of rhodium adducts was studied on heating to the formation of rhodium metal at 400?C in N2 atmosphere using thermogravimetry (TGA), derivatives thermogravimetry (DTG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC), X-ray powder diffraction and IR spectroscopy were used for identification of solid decomposition products. The variation of the rate of heating was used to calculate the activation energy(Ea) and the frequency factor (ln A) for the dehydration and the decomposition processes. In addition, the enthalpy(DH), heat capacity (Cp) and the entropy (DS) changes were also calculated from DSC measurements. The final mass loss after complete decomposition was found to increase appreciably with increasing the heating rate.

Kinetic thermal decomposition; non-linear Rhodium tetracyanoquinodimethan