HETEROMETALLIC COMPLEXES CONTAINING D-BLOCK AND F-BLOCK ELEMENTS - SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF NOVEL NI-ER AND CO-DY COMPOUNDS

The structures of new heterometallic tetranuclear complexes have been determined which each feature two 3d-metal centres, either Co or Ni, a nd two 4f-metal sites; preliminary magnetic data have also been report ed.