Structural characterization of copper(II) complexes based on a new 10-membered binucleating 1,6-diazecine ligand

Mautner, Franz-Andreas; Grȩbowicz, Janusz; Deifik, Patrick J.; Perkins, R. S.; Massoud, Salah S.

doi:10.1016/j.molstruc.2009.05.059

Cited by 3 publications

(4 citation statements)

References 42 publications

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“…The same arrangement in a similar triclinic cell for the ClO 4 − salt of the same cation has been recently characterized [30], while a monoclinic polymorph of this compound, with an asymmetric unit containing a single [Cu 2 (H 2 O) 4 (dimeim)](ClO 4 ) 4 formula, was previously reported [28]. These three closely related structures share a virtually identical conformation for the cation and present identical coordination geometries.…”

Section: [Cu 2 (H 2 O) 4 (Dimeim)](bf 4 ) 4 (1)supporting

confidence: 59%

“…However, on the basis of their colors, suitable single crystals for 1 and 2 were picked from the raw material, and their crystal structures determined. Numerous studies [26][27][28][29][30] carried out during the last ten years showed that the central 10-membered diazecine heterocycle of these compounds is systematically stabilized as a C 2h skewed boat-chair-boat conformer. Such a rigid, highly symmetrical conformation strongly favors the formation of centrosymmetric binuclear coordination compounds, using diazecine and imidazole N atoms as coordination sites [26][27][28][29][30].…”

Section: Resultsmentioning

confidence: 99%

“…In the crystal, cations and BF 4 − ions are held together by OH···F hydrogen bonds involving coordinated water molecules as donor groups (Table 1 and Figure 2). The resulting supramolecular structure is dominated by the formation of a R 4 4 (16) ring motif [31], which, interestingly, was also present in both polymorphs of the ClO 4 − salt [28,30]. Table 1).…”

Section: [Cu 2 (H 2 O) 4 (Dimeim)](bf 4 ) 4 (1)mentioning

confidence: 91%

See 2 more Smart Citations

Fluoride Ion as Ligand and Hydrogen Bond Acceptor: Crystal Structures of Two Dinuclear CuII Complexes Built on a Diazecine Template

2012

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Section: [Cu 2 (H 2 O) 4 (Dimeim)](bf 4 ) 4 (1)supporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: [Cu 2 (H 2 O) 4 (Dimeim)](bf 4 ) 4 (1)mentioning

confidence: 91%

See 1 more Smart Citation

Fluoride Ion as Ligand and Hydrogen Bond Acceptor: Crystal Structures of Two Dinuclear CuII Complexes Built on a Diazecine Template

2012

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“…1. It is relevant to mention that at least twelve other crystal structures of dicopper complexes with diazecine ligands have been described in the literature [5,13,[21][22][23][24][25], one of them (in Ref. [13]) with this same ligand and a different anion, and in each and every one of them copper ions exhibit a square pyramidal coordination geometry.…”

Section: Description Of the Crystal Structurementioning

confidence: 99%

Solvent and pH effects on the redox behavior and catecholase activity of a dicopper complex with distant metal centers

González‐Sebastián

Ugalde‐Saldívar

Mijangos

et al. 2010

Journal of Inorganic Biochemistry

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Revisiting the Synthesis and Nucleophilic Reactivity of an Anionic Copper Superoxide Complex

et al. 2019

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The addition of 1 equiv of KO 2 and Kryptofix222 (Krypt) in CH 3 CN to a solution of LCu(CH 3 CN) [L = N,N′-bis(2,6-diisopropylphenyl)-2,6-pyridinecarboxamide] in tetrahydrofuran at −80 °C yielded [K(Krypt)][LCuO 2 ], the enhanced stability of which enabled reexamination of its reactivity with 2-phenylpropionaldehyde (2-PPA). Mechanistic and product analysis studies revealed that [K(Krypt)][LCuO 2 ] reacts with wet 2-PPA to form [LCuOH] − , which then, deprotonates 2-PPA to yield the copper(II) enolate complex [LCu(OC=C(Me)Ph)] − . Acetophenone was observed upon workup of this complex or mixtures of KO 2 and 2-PPA alone, in support of an alternative mechanism(s) to the one proposed previously involving an initial nucleophilic attack at the carbonyl group of 2-PPA.Elucidating the structure and function of putative monocopper−oxygen intermediates is imperative for understanding many oxygenase enzymes 1 and abiological oxidation catalysts. 2 Common to all mechanistic schemes for the activation of O 2 in such systems is the initial formation of a 1:1 Cu/O 2 species, typically formulated as a copper(II) superoxide comprising a [CuO 2 ] + core. 3 Significant appreciation of the structures and spectroscopic properties of [CuO 2 ] + cores has been achieved through studies of synthetic complexes. 4 Some features of the reactivity of such complexes also have been examined, but many questions concerning detailed mechanisms, supporting ligand effects, 5 and other aspects remain unanswered because of their thermal instability, challenges associated with isolating the complexes in pure form, and complicated side reactions.

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Structural characterization of copper(II) complexes based on a new 10-membered binucleating 1,6-diazecine ligand

Cited by 3 publications

References 42 publications

Fluoride Ion as Ligand and Hydrogen Bond Acceptor: Crystal Structures of Two Dinuclear CuII Complexes Built on a Diazecine Template

Fluoride Ion as Ligand and Hydrogen Bond Acceptor: Crystal Structures of Two Dinuclear CuII Complexes Built on a Diazecine Template

Solvent and pH effects on the redox behavior and catecholase activity of a dicopper complex with distant metal centers

Revisiting the Synthesis and Nucleophilic Reactivity of an Anionic Copper Superoxide Complex

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