Coordination properties of o-benzoquinones. Structure and bonding in tris(tetrachloro-1,2-benzoquinone)chromium(0)

Pierpont, Cortlandt G.; Downs, Hartley H.

doi:10.1021/ja00432a024

Cited by 53 publications

(26 citation statements)

References 11 publications

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“…The electronic spectrum of 61 is dominated by an intense sharp band at ∼520 nm (with ε = 1.7 × 10 3 M −1 cm −1 ) assigned to a spin forbidden transition of a spin flip in the ground state [84] intensified due to the strong antiferromagnetic exchange coupling between the Cr(III) and the three ISQ radicals. The same electronic spectroscopic features were observed in [Cr(CTH)(3,5-DBSQ)] 2 Cl(PF 6 ) 3 , [Cr(CTH)(oCl 4 SQ)](PF 6 ) [85] and in the Cr(SQ) 3 series [86][87][88]. The corresponding LLCT band is observed at ∼750 nm.…”

Section: Chromiumsupporting

confidence: 72%

See 1 more Smart Citation

Transition metal complexes with bulky 4,6-di-tert-butyl-N-aryl(alkyl)-o-iminobenzoquinonato ligands: Structure, EPR and magnetism

Poddel’sky

Cherkasov

Abakumov

2009

Coordination Chemistry Reviews

325

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Section: Chromiumsupporting

confidence: 72%

“…X-ray data for Cr(3,5-DBSQ) 3 [87] and Cr(o-Cl 4 SQ) 3 [88] show these compounds to be monomeric with octahedral structures. The C-O bonds average 1.28(1)Å and are typical for the radical-anion form of the ligands.…”

Section: Chromiummentioning

confidence: 97%

Transition metal complexes with bulky 4,6-di-tert-butyl-N-aryl(alkyl)-o-iminobenzoquinonato ligands: Structure, EPR and magnetism

Poddel’sky

Cherkasov

Abakumov

2009

Coordination Chemistry Reviews

325

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“…Based on this spectroscopic evidence and on the composition of the compound, a −3 charge should be distributable over two chromium complexes. As regards the structural parameters for the chromium complexes, only one crystallographically independent anion is found in which the average C−O bond lengths and O‐Cr‐O angles (Figure 1) are longer than those of Cr III (Cl 4 SQ) 3 ,10 indicating the reduction occurs on the ligand moieties.…”

Section: Methodsmentioning

confidence: 99%

An Unprecedented Mixed-Charged State in a Supramolecular Assembly of Ligand-Based Mixed-Valence Redox Isomers (ET.+)3[CrIII(Cl4SQ)2(Cl4Cat)]−[CrIII(Cl4SQ)(Cl4Cat)2]2−

Chang

Kitagawa

2002

Angew. Chem. Int. Ed.

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“…Anal. Calcd (Found) for C 43 [ONO q ]Al(quinO)Cl (3). A cooled solution of AlCl 3 (80.6 mg, 0.604 mmol, 1 equiv.)…”

Section: Synthesesmentioning

confidence: 99%

Aluminum complexes of the redox-active [ONO] pincer ligand

Szigethy

Heyduk

2012

Dalton Trans.

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A series of aluminum complexes containing the tridentate, redox-active ligand bis(3,5-di-tert-butyl-2-phenol)amine ([ONO]H(3)) in three different oxidation states were synthesized. The aluminum halide salts AlCl(3) and AlBr(3) were reacted with the doubly deprotonated form of the ligand to afford five-coordinate [ONHO(cat)]AlX(solv) complexes (1a, X = Cl, solv = OEt(2); 1b, X = Br, solv = THF), each having a trigonal bipyramidal coordination geometry at the aluminum and containing the [ONHO(cat)](2-) ligand with a protonated, sp(3)-hybridized nitrogen donor. The [ONO] ligand platform may also be added to aluminum through the use of the oxidized ligand salt [ONO(q)]K, which was reacted with AlCl(3) in the presence of either diphenylacetylacetonate (acacPh(2)(-)) or 8-oxyquinoline (quinO(-)) to afford [ONO(q)]Al(acacPh(2))Cl (2) or [ONO(q)]Al(quinO)Cl (3), respectively, with well-defined [ONO(q)](-) ligands. Quinonate complexes 2 and 3 were reduced by one electron to afford the corresponding complexes K{[ONO(sq)]Al(acacPh(2))(py)} (4) and K{[ONO(sq)]Al(quinO)(py)} (5), respectively, containing well-defined [ONO(sq)](2-) ligands. The addition of tetrachloro-1,2-quinone to 1a in the presence of pyridine resulted in the expulsion of HCl and the formation of an aluminum complex with two different redox active ligands, [ONO]Al(o-O(2)C(6)Cl(4))(py) (6). Similar results were obtained when 1a was reacted with 9,10-phenanthrenequinone to afford [ONO]Al(o-O(2)C(14)H(8))(py) (7) or with pyrene-4,5-dione to afford [ONO]Al(o-O(2)C(16)H(8))(py) (8). Structural, spectroscopic and preliminary magnetic measurements on 6-8 suggest ligand non-innocent redox behavior in these complexes.

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Coordination properties of o-benzoquinones. Structure and bonding in tris(tetrachloro-1,2-benzoquinone)chromium(0)

Cited by 53 publications

References 11 publications

Transition metal complexes with bulky 4,6-di-tert-butyl-N-aryl(alkyl)-o-iminobenzoquinonato ligands: Structure, EPR and magnetism

Transition metal complexes with bulky 4,6-di-tert-butyl-N-aryl(alkyl)-o-iminobenzoquinonato ligands: Structure, EPR and magnetism

An Unprecedented Mixed-Charged State in a Supramolecular Assembly of Ligand-Based Mixed-Valence Redox Isomers (ET.+)3[CrIII(Cl4SQ)2(Cl4Cat)]−[CrIII(Cl4SQ)(Cl4Cat)2]2−

Aluminum complexes of the redox-active [ONO] pincer ligand

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