N, N-Diethyl-5(3)-methyl pyrazole-3(5)-CarboxaMide (MPDA) forms bis-complexes of the type M(MPDA)2X2.nH20 CM = Co/Ni/Cu; X = Cl/Br/I5CIl y2S04/N03/C104/BF4_7 which have been characterised by physicochemical methods. Electronic spectral features indicate that thn halo-complexes of Co(II) are mixtures of both tetrahedral and octahedral forms at least in the solid state while, the nickel(II) and the rest of the cobalt(II) species are normal pseudo-octahedral ones. The copper(II) complexes are assigned to have the usual octahedral configuration in the context of the present data the Dq values of Co{II), Ni(II) and Cu(II) complexes, however, are consistent with the position of these ions in the spectrochemical series. IR data point out the pyrazolyl ring nitrogen and the amide oxygen as the probable coordination sites, showing the neutral bidentate (NO) function of the title ligand. © 1984, Taylor & Francis Group, LLC. All rights reserved.