Monometallic and heterobimetallic complexes derived from salen-type ligands

Schley, Michael; Lönnecke, Peter; Hey‐Hawkins, Evamarie

doi:10.1016/j.jorganchem.2009.04.017

Cited by 17 publications

(10 citation statements)

References 56 publications

(18 reference statements)

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“…those reported in related compounds, where the catecholato oxygens do not bridge to another metal. 8,9 As expected the bridging oxygen atoms have slightly longer bond lengths at 2.268(3)Å (avg). 10 The four-membered Zr2O2 ring is bent across the O-O vector by 18.9(1) (Zr1-O2-Zr2-O4) and 14.29(8)˚ (Zr3-O6-Zr4-O8).…”

supporting

confidence: 74%

Synthesis and Molecular Structure of Di(3,5-di-tert-butylcatecholato)-dicyclopentadienylzirconium(IV)

Flogeras

Allan

Vogels

et al. 2011

X-ray Structure Analysis Online

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supporting

confidence: 74%

Synthesis and Molecular Structure of Di(3,5-di-tert-butylcatecholato)-dicyclopentadienylzirconium(IV)

Flogeras

Allan

Vogels

et al. 2011

X-ray Structure Analysis Online

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“…[18] The two strongly electron-donatingg uanidino groups turn o-benzoquinone from an electron-acceptor into an electron-donor.T his study concentrates on Cu 2 and CuPd complexes,w hich are first characterized in their neutral form. In am arked differencet o heterobinuclear complexes with a1 ,2-dioxo-4,5-diimido framework, the ligand L is stable in its quinone rather than its catecholate form.…”

Section: Resultsmentioning

confidence: 99%

“…In the examples discussed in this work, mononuclear Cu andP dc omplexes are prepared in af irst coordination step, and these complexes are then used as precursors to homobinuclear [Cu II -L 0 -Cu II ]a nd heterobinuclear[ Pd II -L 0 -Cu II ]c omplexes. [18] Aside from this, ar eplacement of one Oa tom of 1 with an isosteric NR group leads to two different coordination sites. The heterobinuclear complex is in at emperature-dependent equilibrium with its dimer,w ith two unsymmetrical Cu-Cl-Cu bridges.T he redox-chemistry of the [Cu II -L-Cu II ]a nd [Pd II -L-Cu II ]c omplexes is studied.…”

mentioning

confidence: 98%

“…Tetraoxolene (1), showni ni ts À2charge state,t he two GFAl i-gands1 ,2,4,5-tetrakis(tetramethylguanidino)benzene (2a)a nd 2,3,5,6-tetrakis(tetramethylguanidino)-pyridine (2b), shownint heir neutral charge state, and the new redox-active"hybrid ligand" 4,5-bisguanidino-o-quinone (L), also in its neutral charge state, are presented in this work. [18] Aside from this, ar eplacement of one Oa tom of 1 with an isosteric NR group leads to two different coordination sites. [16] However,t he inherent labilityo ft hese compounds to polymerization and degradationh ampered more research in this area.…”

mentioning

confidence: 99%

“…[15] In their catechol or semi-quinone [17] form, homo-a nd heterobinuclear complexes with a1 ,2-dioxo-4,5-diimido framework are realized, but not in their quinone form. [18] Aside from this, ar eplacement of one Oa tom of 1 with an isosteric NR group leads to two different coordination sites. Recently,ahomobinuclear Fe complex was characterized with as imilar [O,O;N,O]-quinone-type ligand.…”

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confidence: 99%

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Homo‐ and Heterobinuclear Cu and Pd Complexes with a Bridging Redox‐Active Bisguanidino‐Substituted Dioxolene Ligand: Electronic Structure and Metal–Ligand Electron‐Transfer

Schrempp

Schneider

Kaifer

et al. 2017

Chemistry A European J

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A new redox-active 4,5-bisguanidino-substituted o-benzoquinone ligand L is synthesized, which allows rational access to heterobinuclear complexes through the sequential coordination of two metals. In the examples discussed in this work, mononuclear Cu and Pd complexes are prepared in a first coordination step, and these complexes are then used as precursors to homobinuclear [Cu -L -Cu ] and heterobinuclear [Pd -L -Cu ] complexes. In the heterobinuclear complex, the Pd is coordinated by the softer bisguanidine side of L and the Cu by the harder dioxolene side (in line with the HSAB concept). The heterobinuclear complex is in a temperature-dependent equilibrium with its dimer, with two unsymmetrical Cu-Cl-Cu bridges. The redox-chemistry of the [Cu -L-Cu ] and [Pd -L-Cu ] complexes is studied. One-electron oxidation of both complexes was found to be quasi-reversible in CV experiments, and chemical one-electron oxidation was achieved with NO (SbF ). In the case of the homobinuclear complex [L(CuCl ) ] , intramolecular ligand-metal electron-transfer, triggered by coordination of a CH CN solvent molecule, leads to a temperature-dependent equilibrium between the form [Cu -L -Cu ] at low temperatures (with CH CN coordinated to the Cu atom) and [Cu -L -Cu ] at higher temperatures (without CH CN).

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A Tetradentate β‐Diiminato Ligand Containing Phenolate Substituents: Flexivalent Coordination to Mn^III, Co^III, Ni^II, and Cu^II

et al. 2014

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A functionalized β-dialdimine was prepared, bearing a 3,3dimethylindoleninyl group at the meso-position and two Nphenolic groups. The structure contains three labile protons, which can be lost or migrate through tautomerism to provide an N 2 O 2 coordination core. A number of divalent and trivalent metal ions (Cu II , Ni II , Co II/III , and Mn III ) were accommodated inside the core, forming a series of intensely colored products consisting of a tricyclic MN 2 O 2 chelate. In the resulting divalent metal complexes, the dialdimine ligand is deprotonated only at the two phenolic oxygen atoms and is [a]5752 thus dianionic, whereas in the trivalent metal complexes, the dialdiminato ligand is triply deprotonated. The copper and nickel complexes adopt square-planar geometries, whereas in the trivalent cobalt and manganese complexes, two neutral ancillary ligands complete an octahedral geometry around the metal center. In each case, the denticity of the diimino-diiminato ligand is four. The electrochemical oxidation of the copper and nickel complexes was studied by cyclic voltammetry.

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Monometallic and heterobimetallic complexes derived from salen-type ligands

Cited by 17 publications

References 56 publications

Synthesis and Molecular Structure of Di(3,5-di-tert-butylcatecholato)-dicyclopentadienylzirconium(IV)

Synthesis and Molecular Structure of Di(3,5-di-tert-butylcatecholato)-dicyclopentadienylzirconium(IV)

Homo‐ and Heterobinuclear Cu and Pd Complexes with a Bridging Redox‐Active Bisguanidino‐Substituted Dioxolene Ligand: Electronic Structure and Metal–Ligand Electron‐Transfer

A Tetradentate β‐Diiminato Ligand Containing Phenolate Substituents: Flexivalent Coordination to Mn^III, Co^III, Ni^II, and Cu^II

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Monometallic and heterobimetallic complexes derived from salen-type ligands

Cited by 17 publications

References 56 publications

Synthesis and Molecular Structure of Di(3,5-di-tert-butylcatecholato)-dicyclopentadienylzirconium(IV)

Synthesis and Molecular Structure of Di(3,5-di-tert-butylcatecholato)-dicyclopentadienylzirconium(IV)

Homo‐ and Heterobinuclear Cu and Pd Complexes with a Bridging Redox‐Active Bisguanidino‐Substituted Dioxolene Ligand: Electronic Structure and Metal–Ligand Electron‐Transfer

A Tetradentate β‐Diiminato Ligand Containing Phenolate Substituents: Flexivalent Coordination to MnIII, CoIII, NiII, and CuII

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A Tetradentate β‐Diiminato Ligand Containing Phenolate Substituents: Flexivalent Coordination to Mn^III, Co^III, Ni^II, and Cu^II