The electronic, e.s.r., and i.r. spectra of a series of polycrystalline Cu(dien)XY,zH,O and Cu(dien) PX, type complexes are reported, where X and Y are various anions and p = ammonia, ethylenediamine, 2,2'-bipyridyl, and diethylenetriamine. From a correlation of the three types of spectral data a tentative prediction is made of the local molecular copper( 11) ion environment present in the different complexes. Colchester, EssexPREVIOUS papers have attempted to show a relationship between the electronic properties and the stereochemistry of the local molecular environment of the copper (11) ions present in copper (11) complexes involving nitrogen donor ligands, such as ammoniaJ2 ethylene-diarnir~e,~ and 2,2'-bipy15dyl.l.~ The present paper describes the properties of the mono(diethy1enetriamine)-copper (11) complexes. The ligand diethylenetriamine, C,H,,N, (hereafter referred to as dien) Figure IA may act as a mono-, bi-, or tri-dentate nitrogen

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Cobalt(ili) nitrate has been prepared by the reaction of dinitrogen pentoxide with cobalt(fll) fluoride. All three Fitrate groups are bonded in the same bidentate manner in the molecular unit, and the reactivity towards organic compounds is discussed in the light of this structure. Vibrational and electronic spectra and magnetic susceptibility measurements show that the six-co-ordinate molecular unit persists in carbon tetrachloride solution. Ligandfield parameters for Co (NO,), are calculated, and reactions leading to the synthesis of complexes with some organic donor ligands are described.