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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2025-02-01
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| author | Irina V. Ershova Maxim V. Arsenyev Ilya A. Yakushev Alexandr V. Piskunov |
| author_facet | Irina V. Ershova Maxim V. Arsenyev Ilya A. Yakushev Alexandr V. Piskunov |
| author_sort | Irina V. Ershova |
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| description | 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. |
| format | Article |
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| language | English |
| publishDate | 2025-02-01 |
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| spelling | doaj-art-77b057f22cf144b1ae0219905cbc2dd32025-08-20T02:42:22ZengMDPI AGMolbank1422-85992025-02-0120251M197210.3390/M1972Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene LigandsIrina V. Ershova0Maxim V. Arsenyev1Ilya A. Yakushev2Alexandr V. Piskunov3G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina Str., 603950 Nizhny Novgorod, RussiaG. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina Str., 603950 Nizhny Novgorod, RussiaN. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii Prosp. 31, 119991 Moscow, RussiaG. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina Str., 603950 Nizhny Novgorod, RussiaTwo 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.https://www.mdpi.com/1422-8599/2025/1/M1972cobaltredox-active ligandcatecholate1,4-diaza-1,3-butadienecharge transferX-ray diffraction |
| spellingShingle | Irina V. Ershova Maxim V. Arsenyev Ilya A. Yakushev Alexandr V. Piskunov Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene Ligands Molbank cobalt redox-active ligand catecholate 1,4-diaza-1,3-butadiene charge transfer X-ray diffraction |
| title | Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene Ligands |
| title_full | Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene Ligands |
| title_fullStr | Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene Ligands |
| title_full_unstemmed | Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene Ligands |
| title_short | Heteroleptic Cobalt Complexes with Catecholate and 1,4-Diaza-1,3-butadiene Ligands |
| title_sort | heteroleptic cobalt complexes with catecholate and 1 4 diaza 1 3 butadiene ligands |
| topic | cobalt redox-active ligand catecholate 1,4-diaza-1,3-butadiene charge transfer X-ray diffraction |
| url | https://www.mdpi.com/1422-8599/2025/1/M1972 |
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