CoII‐Komplexe von 4,6‐Dimethylpyrimidin‐2(1H)‐on

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Abstract
Some cobalt(II) complexes of 4,6‐dimethylpyrimidine‐2(1H)‐one (HL) have been prepared and studied by infrared and electronic spectra and by magneto‐chemical and conductometric measurements. The ligand is coordinated through the unprotonated ring‐nitrogen atom and in one case also through the carbonylic oxygen atom. The “blue” complexes [CoX2 · 2HL] (X2 = Cl2, ClBr, Br2, (NCS)2) and [CoX2 · 2HL] · 2HL (X = Cl, Br) have a distorted C2v [CoX2N2] coordination; the thiocyanate ion is N‐bonded to the metal. The “green” complexes CoX2 · 2HL (X = Cl(4H2O), Br) have a square‐pyramidal [CoX2N2O] coordination. The “pink” CoX2 · 4HL · nH2O (X = ClO4, n = 2; X = BF4, n = 8; X = F3Ac, n = 4) and “cream” CoX2 · 4HL · 6 H2O (X = I, ClO4) complexes have an octahedral coordination; only the F3Ac− ion is coordinated. The “cyclamen” CoAcL · 2HL · 2 H2O and Co3Ac4L2 · 2HL · 2H2O complexes have a polynuclear constitution; the Ac− ion behaves as bidentate ligand.