Synthesis, Solid‐State Structures, and EPR Spectroscopic Studies on Polycrystalline and Single‐Crystal Samples of α‐Diimine Cobalt(II) Complexes

Rosa, Vítor; González, Pablo J.; Avilés, Teresa; Gomes, Pedro T.; Welter, Richard; Rizzi, Alberto Claudio; Passeggi, M. C. G.; Brondino, Carlos D.

doi:10.1002/ejic.200600448

Cited by 39 publications

(31 citation statements)

References 49 publications

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“…However, the aryl rings themselves are not exactly parallel to each other, making a dihedral angle of 16.79°. These features are similar to the ones found in previous a-diimine complexes synthesised by our group, namely 1a and 2a [9].…”

Section: Synthesis and Characterisation Of Compoundssupporting

confidence: 85%

“…d 107 to À25. These contact shifts are due to the paramagnetic character of the Co(II) complexes that exhibit high spin S = 3/2 in the solid state [9], although in solution they may be involved in equilibria with their S = 1/2 square planar conformers.…”

Section: Synthesis and Characterisation Of Compoundsmentioning

confidence: 98%

“…The planes defined by Cl1-Co1-Cl2 and N1-Co1-N2 form angles of 89.11 and 87.83°, for molecules A and B, respectively. The Cl1-Co1-Cl2 angles are 115.15 (9) and 117.27(8)°, while the N1-Co1-N2 bite angles are 81.5 (2) and 82.2(2)°, for molecules A and B, respectively. The distances Co-Cl and Co-N are similar to the ones found in complexes 2 and 3.…”

Section: Synthesis and Characterisation Of Compoundsmentioning

confidence: 99%

“…We have been interested in the synthesis and characterisation by X-ray diffraction and EPR spectroscopy of cobalt(II) complexes of the general formula [CoX 2 (a-diimine)], where X = Cl, or I and a-diimines such as bis(aryl)acenaphthenequinonediimine (Ar-BIAN) and 1,4-bis(aryl)-2,3-dimethyl-1,4-diaza-1,3-butadiene (Ar-DAB) [9]. The present paper reports on the synthesis and characterisation of further a-diimine Co(II) halide complexes (Scheme 1), namely, [CoI 2 (o,o …”

Section: Introductionmentioning

confidence: 99%

“…Complexes 3 and 4, and also the previously described BIAN analogues 1a and 2a (similar to 1 and 2, respectively, but with X = Cl instead) [9] were activated by methylaluminoxane and tested as catalysts for ethylene polymerisation.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterisation and solid state structures of α-diimine cobalt(II) complexes: Ethylene polymerisation tests

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Section: Synthesis and Characterisation Of Compoundssupporting

confidence: 85%

Section: Synthesis and Characterisation Of Compoundsmentioning

confidence: 98%

Section: Synthesis and Characterisation Of Compoundsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis, characterisation and solid state structures of α-diimine cobalt(II) complexes: Ethylene polymerisation tests

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et al. 2008

Journal of Organometallic Chemistry

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Mechanochemistry: A Tool in the Synthesis of Catalysts, Metallodrugs, and Metallopharmaceuticals

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Duarte

2013

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Cationic and Neutral (Ar‐BIAN)Copper(I) Complexes Containing Phosphane and Arsane Ancillary Ligands: Synthesis, Molecular Structure and Catalytic Behaviour in Cycloaddition Reactions of Azides and Alkynes

Lopes

Figueira

et al. 2013

Eur J Inorg Chem

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A series of new cationic and neutral (Ar‐BIAN)copper(I) complexes [in which Ar‐BIAN = bis(aryl)acenaphthenequinonediimine] was synthesised and characterised by elemental analysis, 1D and 2D NMR spectroscopy and single‐crystal X‐ray diffraction. The cationic complexes of the general formula [Cu(Ar‐BIAN)L2]BF4 [L2 = (PPh3)2 (1), dppe (2), dppf (3), (AsPh3)2 (4); Ar = 4‐iPrC6H4 (a), 4‐MeOC6H4 (b), 4‐NO2C6H4 (c), 2‐iPrC6H4 (d), Ph2PCH2CH2PPh2 (dppe), (Ph2PC5H4)2Fe (dppf)] were synthesised by reaction of [Cu(EPh3)4]BF4 (E = P or As) and equimolar amounts of Ar‐BIAN ligands, or by reaction of equimolar amounts of [Cu(NCMe)4]BF4, 4‐iPrC6H4‐BIAN (a) and diphosphanes dppe or dppf, in dichloromethane, whereas the neutral complexes of the types [CuX(Ar‐BIAN)(EPh3)] [X = Cl, E = P (5); X = I, E = P (6); X = Cl, E = As (9)] and [{CuX(Ar‐BIAN)}2] [X = Cl (7), I (8); Ar = a, b, c, d, 2,4,6‐Me3C6H2 (e), 2,6‐iPr2C6H3 (f)] were prepared by reaction of CuCl or CuI with equimolar amounts of Ar‐BIAN and EPh3 (E = P, As or Sb) in acetonitrile under reflux conditions. The type of ancillary ligand EPh3 and the aryl substituents on Ar‐BIAN play crucial roles in determining the formation of cationic or neutral copper(I) complexes. No copper(I) complexes containing coordinated SbPh3 were isolated; all the corresponding attempts led to dimeric complexes 7 or 8. Most of the complexes crystallised easily. Their study by X‐ray diffraction revealed distorted‐tetrahedral geometries around the copper(I) centres, which are quite influenced by the various aryl substituents on Ar‐BIAN and the ancillary ligands EPh3. All complexes 1–9 except cationic dppf derivative 3a are active catalysts for cycloaddition reactions of alkynes and azides, and also show good tolerance towards functionalised substituents of alkynes and azides. Among them, the PPh3‐coordinated complexes 1, 5 and 6 afforded the highest catalytic activities [turnover frequency = 26.9–45.7 h–1].

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Synthesis, Solid‐State Structures, and EPR Spectroscopic Studies on Polycrystalline and Single‐Crystal Samples of α‐Diimine Cobalt(II) Complexes

Cited by 39 publications

References 49 publications

Synthesis, characterisation and solid state structures of α-diimine cobalt(II) complexes: Ethylene polymerisation tests

Synthesis, characterisation and solid state structures of α-diimine cobalt(II) complexes: Ethylene polymerisation tests

Mechanochemistry: A Tool in the Synthesis of Catalysts, Metallodrugs, and Metallopharmaceuticals

Cationic and Neutral (Ar‐BIAN)Copper(I) Complexes Containing Phosphane and Arsane Ancillary Ligands: Synthesis, Molecular Structure and Catalytic Behaviour in Cycloaddition Reactions of Azides and Alkynes

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