Synthesis and Properties of Cobalt Complexes with [B11H11]4- Ligands

Bernhardt, E.; Drichel, A.; Krnel, Mitja; Svanidze, Eteri; Slabon, A.

doi:10.1021/acs.inorgchem.3c04032

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Synthesis and Properties of Cobalt Complexes with [B₁₁H₁₁]^4- Ligands

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Krnel, Mitja
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Svanidze, Eteri
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bernhardt, E., Drichel, A., Krnel, M., Svanidze, E., & Slabon, A. (2024). Synthesis and Properties of Cobalt Complexes with [B₁₁H₁₁]^4- Ligands. Inorganic Chemistry, 63(12), 5414-5422. doi:10.1021/acs.inorgchem.3c04032.

Cite as: https://hdl.handle.net/21.11116/0000-000F-379F-1

Abstract

The unusually high oxidation state + IV of cobalt is stabilized by ligands based on [B11H11]4- in dark blue colored Cs4[Co(B11H10.11(OH)0.75)2]·4.56H2O, K4[Co(B11H9.19(OH)1.81)2]·2H2O, Cs8[Co{(B11H6)2(O)(O2BOH)4}]2·4H2O and K4[Co{(B11H6)2(O2BOH)5}]·7H2O. These compounds were obtained by reacting Co2+ salts with [B11H14]− under alkaline conditions. In the absence of oxygen, Co(+III) compounds such as the light brownish K4[Co(B11H11)(CN)3]·KCl·2.5H2O are formed. The title compounds were characterized by X-ray crystallography. Cs8[Co{(B11H6)2(O)(O2BOH)4}]2·4H2O and K4[Co(B11H11)(CN)3]·KCl·2.5H2O were also characterized using IR-, UV-vis and cyclovoltammetry. Magnetic measurements of Cs4[Co(B11H10.11(OH)0.75)2]·4.56H2O and ESR measurements of Cs8[Co{(B11H6)2(O)(O2BOH)4}]2·4H2O show that in these Co(+IV) low-spin d5 complexes the unpaired electron is on the dx2-y2, dxy (E2g) orbitals. © 2024 American Chemical Society.