3,6-Di-tert-Butyl-2-Hydroxy-4-Pyridinylphenolate and Tin(IV) Complexes it Forms: Synthesis and Structure Details and Solvatochromic Effect

• Published in: Russian journal of coordination chemistry Vol. 46; no. 12; pp. 795 - 804
• Main Authors: Piskunov, A. V., Pashanova, K. I., Mart’yanov, K. A., Arsen’eva, K. V., Cherkasov, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-12-2020
• Subjects: Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Physical Chemistry; electronic absorption spectroscopy; diolate ligand; zwitter-ion; X-ray diffraction; ESR spectroscopy; tin(IV); solvatochromism
• ISSN: 1070-3284; 1608-3318
• DOI: 10.1134/S1070328420120064

Two synthetic approaches were developed for the preparation of 3,6-di-
tert
-butyl-2-hydroxy-4-pyridinylphenolate (LH), a new zwitter-ionic redox-active diolate type ligand. Two heteroligand five-coordinate tin(IV) derivatives were prepared with this ligand: 3,6-di-
tert
-butyl-2-oxy-4-pyridinylphenolato(triphenyl)tin(IV) (
I
) and 3,6-di-
tert
-butyl-2-oxy-4-pyridinylphenolato(diphenyl)chlorotin(IV) (
II
). The molecular structures of the ligand LH ∙ 0.5Py and complex
I
∙ CH
3
CN were determined by X-ray diffraction (CIF files CCDC nos. 1974166 (LH), 1974165 (
I
)). It was shown that the ligand LH and the tin(IV) compound exhibit solvatochromism, which consists in a considerable blue shift with increasing solvent polarity.