The complexation reaction of cobalt(II) with 12-crown-4 and 15-crown-5 ethers in the presence of the boron cluster anion BH has been studied. Initially, the complexation reaction was carried out in the (EtNH)BH + CoCl + 12-crown-4 system in an acetonitrile/water mixture. Crystals of the compound (NHEt)Na(12-crown-4)CoCl, suitable for X-ray diffraction (XRD) analysis, were isolated from the reaction solution. The obtained compound does not contain the boron cluster anion, and cobalt is present as part of the anionic complex CoCl, while the crown ether is not part of the coordination environment of cobalt(II). Upon the interaction of cobalt chloride with 15-crown-5 in the presence of the closo-decaborate salt, crystals of the complex CoCl(HO)Co(15-crown-5)(HO) · 4(15-crown-5) were isolated from the reaction solution, and their structure was determined by XRD. The boron cluster anion does not participate in the complexation reaction and remains in the reaction solution. The target cobalt(II) complex was obtained in the absence of chloride ions by the reaction of the precursor Co(DMF)BH with the crown ether; the structure of the complex Co(15-crown-5)BH · CHCN was determined by XRD.
E. A. Malinina (Wed,) studied this question.