Abstract The preparation of morpholine complexes of nickel(II), copper(II) and zinc(II) sulphates is described. U.v., visible reflectance and i.r. spectra in the rock salt and low frequency region have been recorded for these complexes in the solid state. Possible structures for these complexes in the solid state are discussed. I.r. spectra in the rock salt region indicate coordinated sulphate groups and that the morpholine is coordinated via the nitrogen and not the oxygen atom. It is suggested that (a) Ni(morpholine) 2SO 4 is a polymeric structure with bridging sulphate groups, (b) Cu(morpholine) 2SO 4 is square planar with sulphate group acting as a chelate, and (c) Zn(morpholine) 2SO 4 and Zn(morpholine)SO 4 are polymeric structures with the sulphate group functioning probably as chelate and of symmetry lower than C 2v Allocation for the possible metal-oxygen and metal-nitrogen modes have also been made.