Structure and Metal‐Metal Interactions in Copper(II) Carboxylate Complexes

Doedens, Robert J.

doi:10.1002/9780470166222.ch9

Cited by 193 publications

(19 citation statements)

References 56 publications

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“…The Cu···Cu' distance is 2.6018(4) Å. This feature is normal as the copper acetate type clusters [3][4][5][6][7]. The N1-O3 and N2-O6 bond distances of the catempo -moieties are 1.2825(17) and 1.2879(15) Å, respectively, which is comparable to that of tempo radical (1.283(9) Å) [36], showing a normal distance as a free nitroxide radical.…”

Section: Crystal Structures Of Chain Compoundsmentioning

confidence: 50%

“…The J values of the chain adducts are in the range of −125-−245 cm −1 for the caproxy and catempo systems, confirming that the copper(II) ions are coupled antiferromagnetically. These coupling constants are comparable to those of the parent complexes as well as the copper(II) carboxylate clusters [3][4][5][6][7]. The interpretation of small negative θ values can be deduced for the radical and copper(II) ion, radical-radical, and/or the dinuclear cluster-dinuclear cluster interaction.…”

Section: Magnetic Data Of One-dimensional Coordination Polymersmentioning

confidence: 59%

“…Copper acetate is one of the old-fashioned metal complexes with a paddle-wheel-like or lantern-like cluster and has attracted much attention since the discovery of the unique dinuclear structure with antiferromagnetic spin-coupling [1][2][3][4][5][6][7]. We have engaged in the synthesis of copper acetate analogues and their coordination polymer complexes [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Chain Compounds Based on Paddle-wheel Copper(II) Carboxylate Bearing Four Nitroxide Radicals

et al. 2018

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Chain compounds of paddle-wheel Cu 2 -clusters of 3-carboxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxy (Hcaproxy) and 4-carboxy-2,2,6,6-tetramethylpiperidinyloxy (Hcatempo) and N,N'-bidentate ligands (L = 4,4 -bipyridine (4,4 -bpy), 1,2-bis(4-pyridyl)ethane (bpe), trans-1,2-bis(4-pyridyl)ethylene (bpel), 4,4 -dipyridyl disulfide (pds), 1,4-diazabicyclo[2.2.2]octane (dabco), and pyrazine (pyz)), [Cu 2 (caproxy) 4 (L)] n , and [Cu 2 (catempo) 4 (L)] n , were synthesized and characterized by elemental analysis, infrared and UV-vis spectra and temperature dependence of magnetic susceptibilities (4.5-300 K). The crystal structures of [Cu 2 (caproxy) 4 (pds)] n , [Cu 2 (catempo) 4 (4,4 -bpy)] n , and [Cu 2 (catempo) 4 (bpe)] n revealed zigzag or linear chains consisting of alternate arrangement of the dinuclear cluster bearing four nitroxide radicals and N,N'-bidentate ligand. Temperature dependence of magnetic susceptibilities showed a considerable antiferromagnetic interaction between the two copper(II) ions within the dinuclear cluster, and weak antiferromagnetic interaction between the dinuclear clusters and/or the radical and dinuclear cluster.

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Section: Crystal Structures Of Chain Compoundsmentioning

confidence: 50%

Section: Magnetic Data Of One-dimensional Coordination Polymersmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Chain Compounds Based on Paddle-wheel Copper(II) Carboxylate Bearing Four Nitroxide Radicals

et al. 2018

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“…[19] At this distance, it is unlikely that acetate bridges two Cu centers. [20] Since the addition of NaI caused the most dramatic changes in the electronic absorbance spectra, we examined the EPR spectra of the complexes with six molar equivalents of added NaI. In Figure 5 (dashed lines), added NaI results in increases in g ʈ , g Ќ , and A ʈ .…”

Section: Role Of the Counteranionmentioning

confidence: 99%

Anion Effects in Cu‐Crosslinked Palindromic Artificial Tripeptides with Pendant Bpy Ligands

2011

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An artificial peptide with three pendant bipyridine (bpy) ligands on a palindromic backbone was designed and used to make multimetallic assemblies. The tripeptide is synthesized by addition of ligand-substituted aminoethylglycine monomers to both ends of a bpy-substituted diacid. The tripeptide was treated with Cu II acetate, tetrafluoroborate, and nitrate salts, and the chelation stoichiometry was confirmed in spectrophotometric titrations. NMR spectroscopy, mass spectrometry, and analytical HPLC separations confirm the identity

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“…Copper(II) acetate forms both magnetically dilute and antiferromagnetic complexes with nitrogen and oxygen donor ligands (Doedens, 1976;Kato et al, 1964;Melnik, 1981a,b;Melnik, 1982;Oldham, 1968). The structure of the complexes depends upon factors such as the steric characteristics of the ligand, the stoichiometry of the complex, and reaction conditions (Bajju, 2002;Catterick and Thornton, 1977;MacDougall et al, 1976;Melnik, 1981;Valentine, et al, 1974).…”

Section: Introductionmentioning

confidence: 98%

Synthesis, Magnetic and Spectroscopic Characterization of Copper(II) Toluate Complexes with Substituted Piperazines

Manhas¹,

Sardana²,

Kalia³

2005

LSRT

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New copper(II) toluate complexes with the saturated heterocyclic bases [(L-L) having the tendency to coordinate through both 1 and 4 nitrogen atoms] 1-methylpiperazine, 1,4-dimethylpiperazine, 2,6-dimethylpiperazine and 1-phenylpiperazine have been prepared and characterized by physico-chemical and spectroscopic methods. All of the complexes were found to be antiferromagnetic with stoichiometries of the type Cu(OOCR) 2 (L-L) n (n 5 1 or 0.5, R 5 2-, 3-or 4-CH 3 C 6 H 4 ) except Cu(OOCC 6 H 4 CH 3 -4) 2 (L-L) (where L-L 5 2,6-dimethylpiperazine), which is magnetically dilute. The spin exchange parameter, 22J, for two of the antiferromagnetic complexes has been evaluated from magnetic susceptibility measurements at different temperatures. Binuclear copper(II) acetate monohydrate-like structure for the antiferromagnetic complexes of 1:1 stoichiometry and polymeric structure of the type Cu(OOCH) 2 (dioxan) 0.5 for the complexes of 1:0.5 stoichiometry have been proposed. The magnetically dilute complex has been assigned a polynuclear trans-pseudo-octahedral or polymeric square pyramidal structure.

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Structure and Metal‐Metal Interactions in Copper(II) Carboxylate Complexes

Cited by 193 publications

References 56 publications

Chain Compounds Based on Paddle-wheel Copper(II) Carboxylate Bearing Four Nitroxide Radicals

Chain Compounds Based on Paddle-wheel Copper(II) Carboxylate Bearing Four Nitroxide Radicals

Anion Effects in Cu‐Crosslinked Palindromic Artificial Tripeptides with Pendant Bpy Ligands

Synthesis, Magnetic and Spectroscopic Characterization of Copper(II) Toluate Complexes with Substituted Piperazines

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