Double azido/cyanato bridged copper(II) dimers incorporating tridentate nitrogen donors Schiff base: Structure, EPR and magnetic studies

Nandy, Madhusudan; Shit, Shyamapada; Garribba, Eugenio; Gómez‐García, Carlos J.; Mitra, Samiran

doi:10.1016/j.poly.2015.07.034

Cited by 14 publications

(9 citation statements)

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“…The electronic spectra of complexes in DCM show d–d absorption at 618 nm as a broad peak, as expected for the octahedral Cu( ii ) complex. 58 The other band appearing at 290 nm is due to the internal transition of the ligand (Fig. S4†).…”

Section: Resultsmentioning

confidence: 99%

A binuclear Cu(ii) complex as an efficient photocatalyst for N-alkylation of aromatic amines

et al. 2022

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Section: Resultsmentioning

confidence: 99%

A binuclear Cu(ii) complex as an efficient photocatalyst for N-alkylation of aromatic amines

et al. 2022

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“…The bridging Cu1–N4–Cu1 (i) and Cu1–N4 (i) –Cu1 (i) bond angles are 102.71(16)°, similar to those observed in other similar dimers. [ 47 ] The cis angles (in the range 73.44–106.61°) and trans angles (with an average value of 161.37°) for the CuN 6 coordination sphere deviate from the ideal values for an octahedral geometry. These observations reveal a distorted octahedral geometry for the Cu1 and Cu1 (i) centers.…”

Section: Resultsmentioning

confidence: 99%

Part‐per‐million catalysis of azide‐alkyne cycloaddition reaction in water using a new ferromagnetic μ_1,1‐N₃ bridged dinuclear Cu(II) complex

Mirdarvatan

Bahramian

Khalaji

et al. 2022

Applied Organom Chemis

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An original copper(II) dimeric compound formulated as [Cu2(μ1,1‐N3)2L2(N3)2].2CHCl3 (1), with L = 2,6‐pyridinedicarboxaldehydebis(p‐iodophenyl‐imine), has been synthesized and characterized. Single crystal X‐ray structural characterization revealed that this complex displays a centrosymmetric dinuclear structure in which the two Cu(II) centers are connected by double symmetric μ1,1 (end‐on, EO) azido bridges, generating distorted octahedral CuN6 coordination geometry. Magnetic susceptibility measurements indicate a ferromagnetic Cu···Cu coupling with J = 26.7 cm−1 (J being the parameter of the exchange Hamiltonian H = −2JS1S2). The catalytic properties of complex 1 have been evaluated in the one‐pot azide‐alkyne cycloaddition reaction in water without any additional reducing agents or bases. As expected, the absence of any catalyst did not lead to product formation, whereas when complex 1 was introduced as catalyst, the reaction led to the desired product with different chemical yields (10–98%), for which the highest one (98%) corresponds to the reaction performed in the presence of 125 ppm of 1 in water at 90 C. These optimized parameters have been then taken into account to extend the initial reaction based on benzyl chloride and simple alkyne to different substituted benzyl chloride and alkyne molecules.

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“…Bands centered between 300–420 nm (λ max at 340 nm for 1 , 323 nm for 2 and 364 nm for 3 ) may be assigned to ligand to ligand charge transfer . The band at 475 nm for 1 may be assigned to a ligand to metal charge transfer, while the broad band at 580 nm for 2 and 620 nm for 3 corresponds to a d ‐ d transitions of the metal ion …”

Section: Resultsmentioning

confidence: 99%

Novel Supramolecular Assemblies of Co(III) & Cu(II) with Diethylenetriamine and Azide: Synthesis, Structure, Spectroscopic and Magnetic Studies

et al. 2018

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In exploring the role of increased ligand basicity as well as denticity on moving from ethylenediamine (en) or 1,3‐diaminopropane (1,3‐dap), on supramolecular solid formation, complexation involving diethylenetriamine (det) and azide with CoII and CuII afforded three new complexes [Co(det)2](N3)3 (1), [Co(det)(N3)3] (2) and [Cu2(det)2(N3)5(H2O)2Na] (3) under self assembling conditions and are characterized structurally and magnetically. Formation of 1 and 2 is sensitive to temperature of crystallization, while such a temperature influence could not be observed for CuII system due to lack of crystals at low temperatures. As expected with a tridentate ligand, strong chelation stabilizes 1 at LT and is a thermodynamically stable product, while isolation of 2 at RT conditions is under kinetic control. Decomposition of 2 at high temperatures (above 70 °C) as revealed through temperature dependent UV‐vis spectral studies also confirms its instability. Presence of three donor sites of det, leads to interesting structural pattern in Jahn‐Teller active CuII, resulting in cationic chains of [Cu(det)(N3)]n+ bridged by μ‐1,3 azido bridges to the neighboring [Na(H2O)2(N3)2]− units, thus leading to a 2‐D assembly of alternating layers of cationic and anionic chains in the unit cell of 3. Magnetic studies of 3 reveals anti‐ferromagnetic interaction between the copper ions (J=– 0.479 cm–1), in conformity with the bridge angle dependent magnetic behavior in azido bridged copper complexes.

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Double azido/cyanato bridged copper(II) dimers incorporating tridentate nitrogen donors Schiff base: Structure, EPR and magnetic studies

Cited by 14 publications

References 86 publications

A binuclear Cu(ii) complex as an efficient photocatalyst for N-alkylation of aromatic amines

A binuclear Cu(ii) complex as an efficient photocatalyst for N-alkylation of aromatic amines

Part‐per‐million catalysis of azide‐alkyne cycloaddition reaction in water using a new ferromagnetic μ_1,1‐N₃ bridged dinuclear Cu(II) complex

Novel Supramolecular Assemblies of Co(III) & Cu(II) with Diethylenetriamine and Azide: Synthesis, Structure, Spectroscopic and Magnetic Studies

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Double azido/cyanato bridged copper(II) dimers incorporating tridentate nitrogen donors Schiff base: Structure, EPR and magnetic studies

Cited by 14 publications

References 86 publications

A binuclear Cu(ii) complex as an efficient photocatalyst for N-alkylation of aromatic amines

A binuclear Cu(ii) complex as an efficient photocatalyst for N-alkylation of aromatic amines

Part‐per‐million catalysis of azide‐alkyne cycloaddition reaction in water using a new ferromagnetic μ1,1‐N3 bridged dinuclear Cu(II) complex

Novel Supramolecular Assemblies of Co(III) & Cu(II) with Diethylenetriamine and Azide: Synthesis, Structure, Spectroscopic and Magnetic Studies

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Part‐per‐million catalysis of azide‐alkyne cycloaddition reaction in water using a new ferromagnetic μ_1,1‐N₃ bridged dinuclear Cu(II) complex