Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene Ligands
Two new heteroleptic cobalt(II) complexes (3,6-Cat)Co(R-DAD) (where (3,6-Cat)<sup>2−</sup> is a dianion of 3,6-di-<i>tert</i>-butyl-<i>o</i>-benzoquinone, R-DAD is diisopropyl-1,4-diaza-1,3-butadiene (R = <i>i</i>-Pr (<b>1</b>)) or dicycloh...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
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| Series: | Molbank |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1422-8599/2025/1/M1972 |
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| Summary: | Two new heteroleptic cobalt(II) complexes (3,6-Cat)Co(R-DAD) (where (3,6-Cat)<sup>2−</sup> is a dianion of 3,6-di-<i>tert</i>-butyl-<i>o</i>-benzoquinone, R-DAD is diisopropyl-1,4-diaza-1,3-butadiene (R = <i>i</i>-Pr (<b>1</b>)) or dicyclohexyl-1,4-diaza-1,3-butadiene (R = <i>c</i>-Hex (<b>2</b>)) have been synthesized and characterized in detail by IR, UV–Vis–NIR spectroscopy, and elemental analysis. The molecular structure of <b>1</b> was determined by X-ray diffraction analysis. Magnetic properties of <b>1</b> and <b>2</b> were measured both in a solid state and in a solution. According to the single-crystal X-ray diffraction analysis, the metal ion in <b>1</b> has a planar coordination environment, but magnetic susceptibility measurements of the microcrystalline samples of <b>1</b> and <b>2</b> indicate the formation of both forms with tetrahedral (<i>d<sup>7</sup></i>, h.s., S<sub>Co</sub> = 3/2) and planar (<i>d<sup>7</sup></i>, l.s., S<sub>Co</sub> = ½) coordination environments of the metal ion. Absorption spectra of crystalline samples of <b>1</b> and <b>2</b> possess intense absorption band in the NIR region. Electrochemical measurements of <b>1</b> and <b>2</b> were also performed. |
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| ISSN: | 1422-8599 |