Summary
The tetramethylthiourea (TMTU) complexes of cobalt(II) and nickel(II) halides have been studied in the solid state by electronic, i.r. and far i.r. spectroscopy and magnetochemically. The tetrahedral Co(TMTU)2X2 (X = Cl, Br, 1) and Ni(TMTU)2X2 (X = Cl, Br) complexes have normal magnetic moments, electronic spectra and crystal field parameters; Ni2 (TMTU)3I4 is diamagnetic. The cobalt complexes have normal ν(CoX) and δ(CoX) vibrational frequencies. Ni(TMTU)2Cl2 and Ni2(TMTU)3I4 have ν(NiX) frequencies corresponding to “long” or bridging Ni-X bonds, while Ni(TMTU)2Br2 has normal ν(NiBr) frequencies for terminal Ni-Br bonds. The ν(MS) frequencies are similar to those of cobalt(II) and nickel(II) complexes of other thioureas.
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Peyronel, G., Pignedoli, A. Triphenylphosphineoxide nitrosyl complexes of molybdenum. Transition Met Chem 3, 63–66 (1978). https://doi.org/10.1007/BF01393510
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DOI: https://doi.org/10.1007/BF01393510