Copper(ii) Coordination Compounds: Classification and Analysis of Crystallographic and Structural Data Iii. Dimeric Compounds

Melnı́k, Milan; Kabešová, M.; Koman, Marián; Macaskova, L.; Garaj, J.; Holloway, Clive Ε.; Valent, Aladár

doi:10.1080/00958979808027144

Cited by 66 publications

(34 citation statements)

References 511 publications

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“…The copper atom is displaced from the squares plane defi ned by the basal atoms toward the apical oxygen atom by 0.190(1) Å. The sum of the bond distances (ΣCu-L) 11.29 Å in 1 (the half value of the Cu···Cu distance is also included in the sum) agrees will with the values reported for known dimeric structures with the CuO 4 O chromophores (Melnik et al, 1998). The values of angles O1-C1-O2 [124.5(3) Å] and O3-C8-O4 [124.4(3) Å] are in the range 11.6-132.0° found for tetracarboxylato dimers with CuO 4 O chromophores (Sundberg et al, 1996).…”

Section: Resultssupporting

confidence: 76%

“…The apical site is occupied by the oxygen atom (O1W) from coordinated water molecules. The apical Cu-O1W bond length of 2.134(2) Å, and the Cu-O carb bond lengths are in good agreement with those found in the other dimeric copper(II) carboxylate complexes (Melnik et al, 1998;Sundberg et al, 1996). The copper atom is displaced from the squares plane defi ned by the basal atoms toward the apical oxygen atom by 0.190(1) Å.…”

Section: Resultssupporting

confidence: 70%

“…The crystal structure of 1 consists of centrosymmetric tetracarboxylato-bridged dimmers [Cu(2-Clbz) 2 (H 2 O)] 2 , where the Cu···Cu separation is 2.5934(6) Å. This molecular structure is typical of dimeric copper(II) carboxylate complexes, where the Cu···Cu distances are in the range 2.56-2.88 Å (Melnik et al, 1998;Sundberg et al, 1996). The τ value (Addison et al, 1984) of 0.0° for the copper atom is typical for square pyramidal geometry.…”

Section: Resultsmentioning

confidence: 99%

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Structures of copper(II) 2-chlorobenzoate monohydrate and copper(II) 3,5-dichlorobenzoate trihydrate

Medvecká¹,

Halaška²,

Jomová³

et al. 2012

Acta Chimica Slovaca

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The crystal structures of the title compounds, [Cu 2 (µ2-2-Clbz) 4 cations are bridged through four 2-chlorobenzoate ligands. The Cu 2+ ion in 1 is pentacoordinated by four oxygen atoms of bridging 2-chlorobenzoate ligands and one coordinated water molecule. The compound 2 forms mononuclear complex, where the Cu 2+ ion is pentacoordinated by two oxygen atoms of monodentate 3,5-dichlorobenzoate ligands and three coordinated water molecule. Both complexes are connected through O-H···O hydrogen bonds into frameworks. The π-π stacking interactions are also observed in crystal structure of 2.

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Section: Resultssupporting

confidence: 76%

Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

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Structures of copper(II) 2-chlorobenzoate monohydrate and copper(II) 3,5-dichlorobenzoate trihydrate

Medvecká¹,

Halaška²,

Jomová³

et al. 2012

Acta Chimica Slovaca

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“…The copper ligands must be well-defined structurally and chemically, and also numerous because NOM has a high sorption capacity and selectivity for Cu(II) over a large concentration range (Gao et al, 1997;Covelo et al, 2004). Since carboxylate moieties comprise the large majority of reactive sites below pH 7 in NOM, and can form a vast number of synthetic coordination complexes with Cu(II) (Melnik et al, 1998a(Melnik et al, ,b, 1999, the strongest bonds are expected to be with carboxyl ligands (Sposito et al, 1979;Boyd et al, 1981). The predominance of oxygen ligands does not exclude other electron donors from being involved in Cu bonding, such as nitrogen as suggested by electron spin resonance (ESR) spectroscopy (Boyd et al, 1983;Senesi and Sposito, 1984;Senesi et al, 1985;Luster et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

The nature of Cu bonding to natural organic matter

Manceau

Matynia

2010

Geochimica et Cosmochimica Acta

175

147

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“…5,6 The great structural diversity of the "paddle wheel" units reported over ca. 60 years 7 maintained the interest in their magnetic properties. Interesting quantum phase transitions produced by randomly distributed interactions between one unit and the "bath" of other units in the lattice have been recently observed by EPR.…”

Section: Introductionmentioning

confidence: 99%

EPR and magnetic studies of a carboxylate-bridged dinuclear copper(II) compound: [cu2(flu)4(dmf)2]

Nascimento

Napolitano

Torre

et al. 2011

J. Braz. Chem. Soc.

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Reportamos neste trabalho os estudos magnéticos e de RPE do composto [Cu 2 (flu) 4 (dmf) 2 ] (flu = flufenamato e dmf = dimetilformamida), tendo os ions Cu II como unidades dinucleares em forma de tetracarboxilato "paddle wheel". Medidas de susceptibilidade magnética na faixa de temperatura 10 ≤ T ≤ 275 K permitiram a determinação da energia de interação antiferromagnética J 0 = -294 ± 5 cm -1 entre os íons Cu II (H ex = −J 0 S 1 ·S 2 ). Medidas de RPE (espectroscopia de ressonância paramagnética eletrônica) em temperatura ambiente com a amostra em pó e monocristal em bandas X e Q resultaram nos valores g // = 2.373, g^ = 2.073 e parâmetros de campo zero D = (-0.334 ± 0.001) cm . Um limite superior de |J´| < 5×10 -3 cm -1 para o acoplamento de intercâmbio entre unidades dinucleares vizinhas a distâncias de ca. 14.24 Å foi estimado com base na variação angular do espectro ao redor do ângulo mágico. Os resultados são discutidos com base na estrutura da unidade dinuclear e das ligações que conectam os íons de Cu II , comparando-os com compostos similares descritos na literatura.We report magnetic and EPR (electron paramagnetic resonance) spectroscopy studies of [Cu 2 (flu) 4 (dmf) 2 ] (flu = flufenamate and dmf = dimethylformamide), which has Cu II ions in tetracarboxylate "paddle wheel" dinuclear units. Susceptibility measurements at 10 ≤ T ≤ 275 K allowed the evaluation of an antiferromagnetic intradinuclear exchange coupling J 0 = -294 ± 5 cm -1 between Cu II ions (H ex = −J 0 S 1 ·S 2 ). EPR experiments at 300 K in powder and single-crystals at 9.5 and 34.4 GHz indicated g // = 2.373, g^ = 2.073 and zero field splitting parameters D = (-0.334 ± 0.001) cm −1 and E ca. 0. EPR signal intensity measurements at X-band in the range 4 ≤ T ≤ 295 K indicated that J 0 = −283 ± 5 cm −1 . A higher limit |J´| < 5×10 -3 cm -1 for the interdinuclear exchange coupling between neighbor units at ca.14.24 Å was estimated from the angular variation of the single crystal spectra around the magic angles. The results are discussed in terms of the structure of the dinuclear unit and the bridges connecting Cu II ions and compared with values reported for similar compounds.

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Copper(ii) Coordination Compounds: Classification and Analysis of Crystallographic and Structural Data Iii. Dimeric Compounds

Cited by 66 publications

References 511 publications

Structures of copper(II) 2-chlorobenzoate monohydrate and copper(II) 3,5-dichlorobenzoate trihydrate

Structures of copper(II) 2-chlorobenzoate monohydrate and copper(II) 3,5-dichlorobenzoate trihydrate

The nature of Cu bonding to natural organic matter

EPR and magnetic studies of a carboxylate-bridged dinuclear copper(II) compound: [cu2(flu)4(dmf)2]

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