CU2-PROPYLAMMONIUM CHLORIDE, NH3(N-C3H7)CL( EPR OF N)

The phase transition in n-propylammonium chloride at 193 K from ambien t tetragonal to monoclinic phase has been studied through Cu2+ electro n paramagnetic resonance (EPR). The EPR spectrum is characterized by g (parallel-to) = 2.058(1), g(perpendicular-to) = 2.147 at 300 K. The ab sence of resolved hyperfine structure due to Cu-63, Cu-65(I= 3/2) nucl ei suggests a site of tetrahedral symmetry for Cu2+. g(parallel-to) g( perpendicular-to), (g) and line width monitored through the phase tran sition show a ''gradual'' change over characteristic of a second order phase transition. The thermal analysis (DSC) and room temperature inf rared spectra were also performed and the results are discussed in det ail.