The complex triaquasulfadiazinecopper(II) sulphate, (Cu(L)(H2O)3)SO4, has been synthesized from CuSO4.5H2O and sulfadiazine in methanol. The complex is paramagnetic with uobs of 1,86(I) BM, with cation: anion ratio of 1:1. The IR spectrum indicates that N-secondary is coordinated to Cu2+ion, while the UV-Vis spectrum shows one peak at maks equal to 787.0 nm (a0=151,95 kJ.mol-1,e=14,79 l.mol-1.cm-1), which corresponds to the transition of 2Eg--2T2g. The complex is probably square planar. keywords: synthesis, complex, copper(II), sulfadiazine. Sentot Budi Rahardjo, Sayekti Wahyuningsih, erlyn Saptorini; Jurusan kimia FMIPA Univ. Sebelas Maret, Surakarta.
