Thermally decomposed products of heteronuclear complexes, CuRE(dhbaen) (NO3) (dmso)(m)(H2O)(n), (RE = Sm, Eu, Gd, Tb, Dy, Y, Ho, Er, Tm, Tb, and Lu)

The thermally decomposed products of the CuRE (dhbaen) (NO3) (dmso)(m)(H2O) (n) complex were investigated by differential thermal analysis (TGA), X-ray diffraction patterns (XRD), energy dispersive X-ray analysis (EDX), and X- ray photoelectron spectroscopy (XPS). A mixed phase of RE2O2SO4 and CuO was formed at a low temperature. The particle size of CuO in the mixed phase w as estimated to be 30-90 nm by XRD. When the ionic radius of RE3+ ion is sm all, the RE2O2SO4 phase decomposed and formed a heterometallic RE2Cu2O5 at 850-1100 degreesC, It appears that one dmso directly interacted with the RE ion (RE-O = S(- CH3)(2)) for the complex and the RE-O = S bond remained as RE2O2SO4 after the decomposition. CuO in the mixed phase did not interact with - SO4 which was confirmed by XPS.