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Synthesis, Crystal Structure, and Properties of Phenylsilicon(IV) Bis-catecholate Complexes

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Abstract

A series of anionic phenylsilicon(IV) bis-catecholate complexes, where (Cat1) = catecholate, (Cat2) = 3,4,5,6-tetrabromocatecholate, (Cat3) = 4-cyanocatecholate, (Cat4) = 4-nitrocatecholate, (Cat5) = 3-fluorocatecholate, and (Cat6) = 4,5-dibromocatecholate, were prepared by the reaction of trimethoxyphenylsilane with two equivalents of catechol or its derivatives containing electron-withdrawing substituents in the benzene ring in the presence of dicyclohexylamine. The complexes were characterized by IR spectra and 1H, 13C, and 29Si NMR spectra, voltammetry, and ESR. The heteroligand anionic phenylsilicon(IV) complexes crystallized from solutions as salts (Chex2NH2)[PhSi(Cat1)2] (I), (Chex2NH2)-[PhSi(Cat2)2]·0.5C6H14 (II), (Chex2NH2)[PhSi(Cat3)2]·2C6H6 (III), (Chex2NH2)[PhSi(Cat4)2]· H2O (IV), (Chex2NH2)[PhSi(Cat5)2] (V), and (Chex2NH2)[PhSi(Cat6)2] (VI) (Chex2\({\text{NH}}_{2}^{ + }\) = dicyclohexylammonium). The composition and structure of the products were confirmed by X-ray diffraction data (CCDC nos. 2150293–2150297 for IV, respectively). The effect of substituent in the benzene ring on the electronic structure of the anion was studied by PBE0/6-311G(d,p) quantum chemical calculations with allowance for non-specific solvation (PCM model). The oxidation potentials of IIVI were measured; radical formation upon electrochemical oxidation and reduction was observed for II.

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ACKNOWLEDGMENTS

Elemental analysis, X-ray diffraction studies, and recording of NMR and IR spectra were supported by the Ministry of Science and Higher Education of the Russian Federation and performed using research equipment of the Molecular Structure Investigation Center of the Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences. P.A. Buikin and A.A. Korlyukov are grateful to the Interdepartmental Supercomputer Center, Russian Academy of Sciences, for providing access to computational resources and software.

Funding

This study was supported by the Russian Foundation for Basic Research (grant no. 19-29-08021).

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Correspondence to A. V. Vologzhanina.

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Dedicated to Academician Yu.A. Zolotov in the year of his 90th birthday

Translated by Z. Svitanko

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Kramarova, E.P., Negrebetskii, V.V., Volodin, A.D. et al. Synthesis, Crystal Structure, and Properties of Phenylsilicon(IV) Bis-catecholate Complexes. Russ J Coord Chem 48, 647–658 (2022). https://doi.org/10.1134/S1070328422090019

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