Synthesis, structure and properties of mononuclear cobalt(II) and cobalt(III) pseudohalide complexes containing N-donor Schiff bases: Synthetic control of metal oxidation levels

Rahaman, Sk Hafijur; Chowdhury, Habibar; Bose, Doyel; Ghosh, Rajarshi; Hung, Chen‐Hsiung; Ghosh, Barindra Kumar

doi:10.1016/j.poly.2005.05.010

Cited by 52 publications

(24 citation statements)

References 16 publications

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“…The chemical structures of the complexes as catalysts are related to the overall catalytic copolymerization performance of CO 2 with an epoxide. [8] Transition metal Schiffbase complexes with N,N,O,O-tetradentate ligands have been extensively studied, [9][10][11][12][13][14][15][16] because of their various applications [17][18][19] and importance in the area of coordination chemistry. [20] Cobalt(III) Schiff-base complexes are characterized by the asymmetric structure containing axial ligands, which are frequently labile, and exhibit high activities and yet a significant stability.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Zhuang

Oyaizu

Niu

et al. 2010

Macro Chemistry & Physics

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A series of cobalt complexes with N,N,O,O‐tetradentate Schiff base ligands were prepared. All the complexes were characterized by spectroscopy and electrochemical methods. An X‐ray crystal structure analysis revealed that L1‐CoIII‐dnp was monomeric with a six‐coordinated central cobalt(III) atom in the solid state. The complexes were employed as catalysts for the alternating copolymerization of CO2 and racemic propylene oxide. End group analysis of the resulting polymer provided strong evidence for a monomer insertion mechanism for the propagation step. The catalytic activity was interpreted using the redox potential of cobalt(II/III) for the L‐CoIII‐dnp complexes, which offered a measure of the bond strength, or the degree of inertness of the axial ligand, to promote or suppress the monomer insertion.magnified image

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Section: Introductionmentioning

confidence: 99%

“…Crystal data for L 1 -Co IIIdnp: C 42 H 55 CoN 4 O 20 , M ¼ 786.83, triclinic space group P1. a ¼ 11.2788(13) …”

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confidence: 99%

Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Zhuang

Oyaizu

Niu

et al. 2010

Macro Chemistry & Physics

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“…The essential prerequisites for such research are the judicious choice [6] of organic spacers and inorganic/organic terminals/bridges that may lead to properties of interest. Recently, we have been interested [7][8][9][10][11] in the construction of different coordination complexes by variation of ligand backbones and metal coordination environments; in this regard, Schiff base spacers and pseudohalide terminal or bridging ligands have been widely used. Schiff bases [12] are useful chelators because of their ease of preparation, structural variety, varied denticities, and subtle steric and/or electronic effects.…”

Section: Introductionmentioning

confidence: 99%

Syntheses, structures, and properties of two mononuclear cobalt(III) azido complexes containing a tetradentate N-donor Schiff base as end-capping ligand

Khan

Roy

Bhar

et al. 2010

Transition Met Chem

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Two hexacoordinated mononuclear Co(III) compounds of the type cis-[Co(L)(N 3 ) 2 ] X [1, X = ClO 4 ; 2, X = PF 6 ; L = N,N 0 -(bis(pyridine-2-yl)benzylidine)-1,4-butanediamine] have been synthesized and characterized by physicochemical and spectroscopic methods. The crystal structures of complexes 1 and 2 both have distorted octahedral geometry with two terminal azides in mutual cis orientations. In the crystalline state, two mononuclear units of 1 are associated by weak C-H…p interactions to produce a dimeric unit, which packs through C-H…O hydrogen bonds and p…p interactions leading to a 2-D continuum. The mononuclear units in 2 are engaged in weak cooperative intermolecular C-H…p interactions and multiple C-H…F hydrogen bonds giving rise to a 3-D network structure. These diamagnetic compounds are redox active and show luminescence in DMF solutions.

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“…The electronic spectrum of the Fe(III) complex exhibits four bands at 312, 358, 440 and 627 nm. The first two peak in the UV region may be assigned to n-p* and p-p* transition [34,35]. The medium intensity band at 440 nm may be assigned as 6 A 1g ?…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and catalytic activity of polymer anchored transition metal complexes toward oxidation reactions

Mondal

Tuhina²,

Roy

et al. 2010

Transition Met Chem

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The polymer-anchored Schiff base complexes of Cu(II), Co(II), Ni(II), Mn(II) and Fe(III) were prepared by reacting polystyrene amine with 2-pyridinecarbaldehyde followed by loading of metal atom in methanol. These complexes were characterized by using different physicochemical and spectroscopic methods. The catalytic activity of these polymer-supported metal catalysts was tested for the oxidation of various olefins and alcohols. Influence of various reaction parameters, such as reaction temperature, reaction time, oxidant, substrate-to-oxidant mole ratio and nature of solvent, was studied for the oxidation of cyclohexene with these catalysts. Among the catalysts studied, Cu-Cat showed higher catalytic activity toward oxidation reactions than the other catalysts. Moreover, hot filtration experiments proved that these catalysts are truly heterogeneous and can be reused a number of times without significant loss of activity.

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Synthesis, structure and properties of mononuclear cobalt(II) and cobalt(III) pseudohalide complexes containing N-donor Schiff bases: Synthetic control of metal oxidation levels

Cited by 52 publications

References 16 publications

Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Syntheses, structures, and properties of two mononuclear cobalt(III) azido complexes containing a tetradentate N-donor Schiff base as end-capping ligand

Synthesis, characterization and catalytic activity of polymer anchored transition metal complexes toward oxidation reactions

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