Fluxionality in polynuclear copper(II) complexes containing aminoalcoholate ligands: syntheses, crystal structures, and 1H nuclear magnetic resonance studies

Breeze, Steven R.; Wang, Suning; Chen, Liqin

doi:10.1039/dt9960001341

Cited by 24 publications

(11 citation statements)

References 12 publications

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“…Compound 2 is composed of discrete neutral molecules consisting of two deprotonated ligands (L − ), each delivering a set of three donor atoms N 2 O to a cluster of four copper(II) centers μ 4 ‐bridged by a distorted tetrahedral oxygen atom (O 1 1) 27. 29, 36 Two benzoate groups link Cu1 and Cu4 and another two link Cu2 and Cu3, with each benzoate showing alternating short (1.94 Å) and long (2.35 Å) CuO bonds. The four CuN imine bonds are consistently found at 1.98 Å, fostering a five‐coordinate geometry.…”

Section: Resultsmentioning

confidence: 99%

Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L₂Cu₄(μ₄‐O)(μ₂‐carboxylato)₄] Soft Materials

Shakya¹,

Hindo²,

Wu³

et al. 2007

Chemistry A European J

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A general approach toward amphiphilic systems bearing multimetallic clusters and their ability to form Langmuir-Blodgett films is presented. The synthetic strategy to stabilize these clusters involves the use of a ligand (HL) containing an N(2)O-donor set and long octadecanoic chains to obtain the carboxylate-supported [L(2)Cu(4)(mu(4)-O)(mu(2)-OAc)(4)]EtOH (1) and [L(2)Cu(4)(mu(4)-O)(mu(2)-OBz)(4)] (2) in which OAc(-) and OBz(-) represent acetate (1) and benzoate (2) co-ligands. These species were thoroughly characterized and had their structures solved by X-ray crystallography. We observed that the mu-oxo Cu(4) cluster is antiferromagnetically coupled and used broken-symmetry density functional theory (DFT) calculations to describe the main superexchange pathways of the tetracopper core. We also describe the amphiphilic properties of the ligand and the cluster-containing systems by means of area versus pressure isotherms and show that these cluster-bearing species can be transferred onto solid substrates yielding homogeneous Langmuir-Blodgett films, as characterized by atomic force microscopy and contact angle measurements.

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Section: Resultsmentioning

confidence: 99%

Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L₂Cu₄(μ₄‐O)(μ₂‐carboxylato)₄] Soft Materials

Shakya¹,

Hindo²,

Wu³

et al. 2007

Chemistry A European J

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“…[33][34][35] Complexes with N 2 O donor ligands having tetranuclear {Cu 4 (m 4 -O)} cores are described in research articles and have been studied extensively. [36][37][38][39][40][41] The four copper atoms arrange themselves in a distorted tetrahedron keeping the m 4 -O at the center. These complexes have been widely studied because of their interesting structure in solution or solid state, their magnetic behavior 41-43 and catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Tetranuclear copper(ii)–Schiff-base complexes as active catalysts for oxidation of cyclohexane and toluene

Roy

Manassero

2010

Dalton Trans.

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Three new Cu(ii) complexes, [Cu(4)(O)(L(n))(2)(CH(3)COO)(4)] where HL(1) = 4-methyl-2,6-bis(2-fluoroethyliminomethyl) phenol for complex , HL(2) = 4-methyl-2,6-bis(2-chloroethyliminomethyl) phenol for complex .0.25CH(3)CN and HL(3) = 4-methyl-2,6-bis(2-bromoethyliminomethyl) phenol for complex have been synthesized and characterized by elemental analysis, FTIR, UV-vis spectroscopy, and electrospray ionization mass spectroscopy. The structure of complex .0.25CH(3)CN has also been confirmed by single crystal X-ray diffraction analysis. These complexes have been found to be active catalysts for the oxidation of cyclohexane and toluene in the presence of hydrogen peroxide as the oxidant under mild conditions. Cyclohexane is oxidized to yield cyclohexanol and cyclohexanone, whereas toluene is oxidized to benzyl alcohol and benzaldehyde.

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“…2. The structure of complex 2 is composed of four copper atoms, a l 4 -bridging oxygen atom, similar to those found in other copper(II) complexes [16,17], two l-chloride atoms, and four deprotonated ligands (L -). (2), respectively.…”

Section: Resultsmentioning

confidence: 96%

Copper complexes of 1-[(2-carboxyethyl)benzene]-3-[2-pyridine]triazene

Liu

et al. 2011

Transition Met Chem

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The triazenide, 1-[(2-carboxyethyl)benzene]-3-[2-pyridine]triazene (HL), has been synthesized. In the presence of Et 3 N, the reaction of HL with Cu(OAc) 2 ÁH 2 O or CuCl 2 Á2H 2 O gives the tetranuclear copper(II) complexes {Cu 4 (L) 2 (l 2 -OH) 2 (OAc) 4 } 1 and {Cu 4 L 4 (l 4 -O)Cl 2 } 2, respectively. The X-ray crystal structures of both complexes have been obtained. Magnetic studies indicate significant antiferromagnetic coupling between the copper(II) centers for both complexes, with coupling constants (J) of -493.4 cm -1 for 1 and -165 cm -1 for 2.

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Fluxionality in polynuclear copper(II) complexes containing aminoalcoholate ligands: syntheses, crystal structures, and 1H nuclear magnetic resonance studies

Cited by 24 publications

References 12 publications

Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L₂Cu₄(μ₄‐O)(μ₂‐carboxylato)₄] Soft Materials

Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L₂Cu₄(μ₄‐O)(μ₂‐carboxylato)₄] Soft Materials

Tetranuclear copper(ii)–Schiff-base complexes as active catalysts for oxidation of cyclohexane and toluene

Copper complexes of 1-[(2-carboxyethyl)benzene]-3-[2-pyridine]triazene

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Fluxionality in polynuclear copper(II) complexes containing aminoalcoholate ligands: syntheses, crystal structures, and 1H nuclear magnetic resonance studies

Cited by 24 publications

References 12 publications

Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L2Cu4(μ4‐O)(μ2‐carboxylato)4] Soft Materials

Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L2Cu4(μ4‐O)(μ2‐carboxylato)4] Soft Materials

Tetranuclear copper(ii)–Schiff-base complexes as active catalysts for oxidation of cyclohexane and toluene

Copper complexes of 1-[(2-carboxyethyl)benzene]-3-[2-pyridine]triazene

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Product

Resources

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Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L₂Cu₄(μ₄‐O)(μ₂‐carboxylato)₄] Soft Materials

Amphiphilic and Magnetic Properties of a New Class of Cluster‐Bearing [L₂Cu₄(μ₄‐O)(μ₂‐carboxylato)₄] Soft Materials