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Catecholato complexes of cobalt and nickel with 1,4-disubstituted-1,4-diazabutadiens-1,3 and 1,2-bis(diphenylphosphino)ethane

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Abstract

Divalent cobalt and nickel form four-coordinate complexes with sterically hindered 3,6-di-tert-butylcatecholato dianion (3,6-DBCat) and neutral bidentate 1,4-disubstituted-1,4-diazabutadiens-1,3 (DAB). Structural study of (1,4-di-tert-butyl-1,4-diazabutadiene-1,3)(3,6-di-tert-butyl-catecolato)nickel and (1,4-bis-(2,6-di-iso-propylphenyl)-2,3-dimethyl-1,4-diazabutadiene-1,3)(3,6-di-tert-butyl-catecolato)cobalt indicates square-planar environment of metals. Chemical one-electron oxidation of nickel complexes proceeds through catecholate ligand and leads to o-semiquinonato adducts. EPR spectral parameters indicate preservation of square-planar configuration after oxidation. Complexes (DAB)M(Cat) (M = Ni, Co) undergo neutral ligand substitution reactions.

A number of four-coordinated square-planar mono-catecholato complexes of cobalt and nickel of general formula (L)M(3,6-DBCat) were synthesized and characterized (L= N,N’-disubstituted 1,4-diazabutadienes-1,3 (DAB), dipyridine, bis(diphenylphosphino)ethane; M=Co, Ni; 3,6-DBCat =3,6-di-tert-butyl-catecholato dianion).

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Acknowledgements

The authors are thankful to L. Abakumova, N. Khamaletdinova and O. Kuznetcova for IR spectra recording. This work was supported by RFBR (grants: 13-03-97070), by Russian President Grant supporting scientific schools (NSh-271.2014.3), by Program of presidium of RAS \(\mathcal {N}{\underline {\circ }}\) 18. This research was partly supported by the grant (the agreement of August 27, 2013 \(\mathcal {N}{\underline {\circ }}\) 02.B.49.21.0003 between The Ministry of education and science of the Russian Federation and Lobachevsky State University of Nizhni Novgorod).

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  1. G A Razuvaev Institute of Organometallic Chemistry of RAS, 603950 Tropinina str. 49, GSP-445, Nizhny Novgorod, Russia

    MICHAEL P BUBNOV, IRINA A TEPLOVA, NIKOLAY O DRUZHKOV, GEORGY K FUKIN, ANNA V CHERKASOVA & VLADIMIR K CHERKASOV

  2. Lobachevsky State University of Nizhny Novgorod, 23 Prospekt Gagarina, 603950, Nizhni Novgorod, Russia

    MICHAEL P BUBNOV, GEORGY K FUKIN & VLADIMIR K CHERKASOV

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  1. MICHAEL P BUBNOV
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  2. IRINA A TEPLOVA
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Correspondence to MICHAEL P BUBNOV.

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Supplementary Information

CCDC-678237 (1) and CCDC- 678238 (9) contain the supplementary crystallographic data, which can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; Fax: (internat.) + 44-1223-336-033; E-mail: deposit@ccdc.cam.ac.uk. Check CIF files are avaialble at www.ias.ac.in/chemsci

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BUBNOV, M.P., TEPLOVA, I.A., DRUZHKOV, N.O. et al. Catecholato complexes of cobalt and nickel with 1,4-disubstituted-1,4-diazabutadiens-1,3 and 1,2-bis(diphenylphosphino)ethane. J Chem Sci 127, 527–535 (2015). https://doi.org/10.1007/s12039-015-0805-2

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