New bis-o-benzosemiquinonato tin(IV) complexes

Ilyakina, Ekaterina V.; Poddel’sky, Andrey I.; Piskunov, A. V.; Сомов, Н. В.; Abakumov, G. A.; Cherkasov, V. K.

doi:10.1016/j.ica.2012.08.018

Cited by 22 publications

(17 citation statements)

References 25 publications

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“…All these complexes were found to be monomeric, colored viscous liquids and are sol uble in polar solvents (methanol, ethanol, DMSO, and DMF). On the basis of 119 Sn NMR observations, a five coordination geometry around tin(IV) atom in these complexes is proposed tentatively. Five new chlorodiorganotin(IV) complexes derived from dithio carbamate ligands have been prepared and structurally characterized in [113].…”

Section: Introductionmentioning

confidence: 90%

“…The crystal structures of three complexes, Ph 3 SnL 1 H, Ph 3 SnL 3 H, Ph 3 SnL 4 H, were determined. All these complexes display an essentially tetrahedral geometry with angles ranging from 93.50° to 124.5° and 119 Sn Mössbauer spectral data support this assignment [110].…”

Section: Introductionmentioning

confidence: 94%

“…On the basis of spectral and structural investigations, the Schiff base exists in the keto amine form in both solu tion and the solid phase, and is coordinated to tin as dianionic tridentate via the imine nitrogen and phe nolic and enolic oxygen atoms. On the basis of 119 Sn NMR data, the coordination number of tin is retained as five in solution. The synthesized organotin com plexes are specialized in inhibiting both Gram posi tive (B. subtilis and S. aureus) and Gram negative (E. coli and P. aeruginosa) bacterial species, and the diphenyl complex exhibits a greater inhibitory effect.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, six new tin complexes of the formulae [(Ph 3 Sn) 2 (PhSn) 10 2 ] displays a typical ladder structure [118]. New bis o benzosemiquinonato tin(IV) complexes (3,6 SQ) 2 SnCl 2 , (3,6 SQ) 2 SnBr 2 , and (3,6 SQ) 2 SnPh 2 (3,6 SQ is radical anion 3,6 di tert butyl o benzosemiquinone) were synthesized by different methods in [119]. The reaction of tin(IV) catecholates (3,6 Cat)SnX 2 · 2THF (Х = Cl, Br) with nitrogen(IV) oxide leads to EPR active six coordinated mono o benzosemiquinonato complexes of (3,6 SQ)SnX 2 (NO 2 ) · THF type which undergo symmetri zation to the corresponding diradical bis o benzosemi quinonato species (3,6 SQ) 2 SnX 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Some examples of the applications of this method are mentioned later in different sections. 119 Sn chemical shifts are influenced by variation in coordi nation number, bond angles, and nature of substitu ents at tin. 119 Sn NMR is strongly dependent on the coordination number of tin, and an increase in coor dination number produces a large upfield shift.…”

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Coordination chemistry of Schiff base tin complexes

2014

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Coordination chemistry of Schiff base tin complexes

2014

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Catecholate Complexes of p‐Block Elements: Redox Activity

Maskey¹,

Greb²

2022

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The chemistry of catecholate ligands at d‐block metals, particularly the ligand‐redox noninnocence happening in such complexes, is well established and has been summarized several times. Analog complexes with p‐block central elements have also been intensively studied, but these aspects have rarely been presented collectively. The present article describes the chemistry of p‐block elements substituted with catecholates or redox isomeric states (semiquinone and quinone), focusing on the redox activity within such assemblies. Representative examples spanning from group 13 to group 16 and covering the early beginnings till more recent developments are discussed, with corresponding aspects of magnetic properties and electron spin resonance spectroscopy. Due to the usually significant energetic difference between p‐block element‐located orbitals and ligand‐located orbitals, the occurrence of redox noninnocence or aspects such as valence tautomerism is much less numerous as in the related d‐block metal chemistry. However, as transpires, the heavier p‐block elements with more pronounced redox flexibility are more prone to participate in redox processes alongside ligand‐centered redox events. Although p‐block elements with redox‐active ligands still constitute a somewhat patchy field of research, the overview given in this article might offer a feeling for promising developments that are still to be developed.

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Tin(IV) and Antimony(V) Complexes Bearing Catecholate Ligands Connected to Ferrocene – Syntheses, Molecular Structures, and Electrochemical Properties

et al. 2016

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The ferrocenyl‐containing 3,5‐di‐tert‐butylcatechol Fc‐L‐CatH2 (2) was synthesized by the condensation of the precursor 6‐(hydrazonomethyl)‐3,5‐di‐tert‐butylcatechol 6‐(H2N–N=CH)CatH2 (1) with ferrocenecarboxaldehyde (L = –CH=N–N=CH–, Cat = 3,5‐di‐tert‐butylcatecholate, Fc = ferrocene). The exchange reaction between catechol 2 and Ph3SbBr2 in the presence of a base (Et3N) in toluene leads to the formation of the triphenylantimony(V) catecholate (Fc‐L‐Cat)SbPh3 (3) as the main product and the ionic bromotriphenylantimony(V) catecholate (Fc‐LH‐Cat)SbPh3Br (4) containing a hydraziniumylidene cation (LH = –CH=NH+–N=CH–) as the byproduct. The change of toluene to tetrahydrofuran (THF) results in the formation of 4 as the main product in nearly quantitative yield. The exchange reactions of catechol 2 with Ph2SnCl2 and SnCl4 give anionic catecholate complexes bridged with hydraziniumylidene cations even in the presence of excess base. Complexes (Fc‐LH‐Cat)SnPh2Cl (5), (Fc‐LH‐Cat)2SnPh2 (6), and (Fc‐LH‐Cat)2SnCl2 (7) were synthesized. The compounds obtained were characterized by IR spectroscopy, 1H and 13C NMR spectroscopy, elemental analysis, and cyclic voltammetry. The molecular structures of crystals of 5–7 were determined by X‐ray diffraction analysis. The formation of catecholates 4–7 with hydraziniumylidene cations is caused by intramolecular hydrogen bonding between the hydroxy and imine groups, which leads to proton transfer from the oxygen atom to the nitrogen atom of the hydrazine linker.

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New bis-o-benzosemiquinonato tin(IV) complexes

Cited by 22 publications

References 25 publications

Coordination chemistry of Schiff base tin complexes

Coordination chemistry of Schiff base tin complexes

Catecholate Complexes of p‐Block Elements: Redox Activity

Tin(IV) and Antimony(V) Complexes Bearing Catecholate Ligands Connected to Ferrocene – Syntheses, Molecular Structures, and Electrochemical Properties

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