Unlabelled: Treatment of [Co(CO)] with the -substituted P(C-X)P ligands (X = Br, Cl; R = Pr, Bu) bearing Y = NH and CH linkers under solvothermal conditions affords the five-coordinate Co(I) and Co(III) complexes [Co(PCP-R)(CO)] and [Co(PCP-R)X]. The later are paramagnetic exhibiting a solution magnetic moment in the range of 3.0-3.3 μ which is consistent with a d intermediate spin system corresponding to two unpaired electrons. In the case of P(C-X)P ligands (X = Br, Cl; R = Bu; Y = NH) the formation of the square planar Co(II) complex [Co(PCP-Bu)X] was favored. This complex gives rise to a magnetic moment of 1.8 μ being consistent with a d low spin system corresponding to one unpaired electron. All complexes are characterized by means of spectroscopic techniques (NMR, IR), HR-MS. Representative complexes were also characterized by X-ray crystallography.
Supplementary Information: The online version contains supplementary material available at 10.1007/s00706-023-03123-x.
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