Tuning the nature of the exchange interaction in out-of-plane oximato-bridged dinuclear copper(II) complexes

Cervera, Beatriz; Ruiz, Rafael; Lloret, Francesc; Julve, Miguel; Cano, Juan; Faus, Juan; Bois, Claudette; Mroziński, Jerzy

doi:10.1039/a604420d

Cited by 86 publications

(53 citation statements)

References 27 publications

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“…As expected the mononuclear precursors [NiL] 3 and [CuL] 4 effectively function as 'ligand complexes' to yield di-or trinuclear complexes (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). Complexes 3 and 4 are not involved in self-assembling processes.…”

Section: Synthesis and General Characterization Of The Di-and Tri-nucmentioning

confidence: 87%

Bridging ability of a novel polydentate ligand (H2L) comprising an oxime function. Structures of a mononuclear precursor [NiL] and a dinuclear CuII2 complex. Magnetic properties of mononuclear (NiII and CuII), dinuclear (CuII2, NiII2, NiIICuII and CuIICrIII) and trinuclear (CuII3, CuIIMnIICuII and CuIIZnIICuII) complexes ‡

Costes¹,

Dahan²,

Dupuis³

et al. 1998

J. Chem. Soc., Dalton Trans.

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A novel non-symmetrical polydentate Schiff base ligand 3-({2-[(1-methyl-3-oxobut-1-enyl)amino]ethyl}imino)-butan-2-one oxime (H 2 L) comprising an oxime function among various donor sites yields neutral [Ni II L] and [Cu II L] complexes. The structural determination of [NiL] confirms the deprotonation of the oxime function. The deprotonated oxime oxygen atom can react with auxiliary complexes to give homo-and hetero-di-and tri-nuclear entities. The structural determination of a homodinuclear copper complex clearly shows the presence of the expected oxime bridge, along with an unexpected ketonic bridge between the two copper centres leading to a Cu[O,NO]Cu core. A moderate antiferromagnetic interaction is present in the di-and tri-nuclear copper complexes. A similar interaction is also observed in the heteronuclear complexes (Cu II Ni II and Cu II Mn II ) and, more surprisingly, in the heterodinuclear Cu II Cr III entity. A generalization of the Cu [O,NO]Cu structure leads to a justification of these magnetic properties.In search of new polydentate bridging ligands we have been interested in designing a ligand (H 2 L, Fig. 1) which comprises an oxime function among various donor sites.Indeed it has been known for more than twenty years that oximato groups (᎐ ᎐ N᎐O Ϫ ) can bridge metal ions through their imino nitrogen and deprotonated oxygen atoms. Very generally double oximato bridges or association of a single N᎐O bridge with a second bridging ligand are involved in the resulting bi-or poly-nuclear complexes. Many types of homo-and heteropolynuclear complexes 1-15 have been obtained and magnetic investigations have revealed a great variety of behaviours, strong antiferromagnetism, weak antiferromagnetism and even ferromagnetism. It may be noted that singlet-triplet energy gaps of the order of 1000 cm Ϫ1 have been reported for oximato bridged dinuclear copper() complexes in which the double oximato bridge adopts the cis conformation. 3,10,11The present paper reports on the preparation, characterization and magnetic study of mononuclear Cu II and Ni II , dinuclear complexes involving the Cu II Cu II , Cu II Ni II and Cu II Cr III pairs and trinuclear complexes Cu II Cu II Cu II , Cu II Zn II Cu II and Cu II Mn II Cu II deriving from H 2 L. The structures of a mononuclear [NiL] precursor and a homodinuclear Cu II 2 complex are also reported.

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Section: Synthesis and General Characterization Of The Di-and Tri-nucmentioning

confidence: 87%

Bridging ability of a novel polydentate ligand (H2L) comprising an oxime function. Structures of a mononuclear precursor [NiL] and a dinuclear CuII2 complex. Magnetic properties of mononuclear (NiII and CuII), dinuclear (CuII2, NiII2, NiIICuII and CuIICrIII) and trinuclear (CuII3, CuIIMnIICuII and CuIIZnIICuII) complexes ‡

Costes¹,

Dahan²,

Dupuis³

et al. 1998

J. Chem. Soc., Dalton Trans.

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“…Fig.2 shows the tentative geometry of the complexes; the ligand acts as bidentate ligand with −O and =N sites and forms a dimeric complex with Co(II), Ni(II) and Cu(II). In the UV-visible spectra of the Cu(II) complex, a broad band at 437 nm and a shoulder at 480 nm were observed which may be assigned to 2 B 1g → 2 B 2g and 2 B 1g → 2 A 1g transition in a tetragonal field, respectively (Alvarez et al, 1990;Cervera et al, 1997). The UV-visible spectra of the Co(II) complex show two bands, one at 360 nm and the other at 452 nm, which may be assigned to 4 A 2 → 4 T 1 (F) and 4 A 2 → 4 T 1 (P) transitions in tetrahedral complexes, respectively (West, 1962).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Schiff bases of naphtha[1,2-d]thiazol-2-amine and metal complexes of 2-(2′-hydroxy)benzylideneaminonaphthothiazole as potential antimicrobial agents

Azam

Singh

Khokhra

et al. 2007

J. Zhejiang Univ. - Sci. B

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Abstract:Objective: A series of 2-benzylideneaminonaphthothiazoles were designed and synthesized incorporating the lipophilic naphthalene ring to render them more capable of penetrating various biomembranes. Methods: Schiff bases were synthesized by the reaction of naphtha[1,2-d]thiazol-2-amine with various substituted aromatic aldehydes. 2-(2'-Hydroxy)benzylideneaminonaphthothiazole was converted to its Co(II), Ni(II) and Cu(II) metal complexes upon treatment with metal salts in ethanol. All the compounds were evaluated for their antibacterial activities by paper disc diffusion method with Gram positive Staphylococcus aureus and Staphylococcus epidermidis and Gram negative Escherichia coli and Pseudomonas aeruginosa bacteria. The minimum inhibitory concentrations of all the Schiff bases and metal complexes were determined by agar streak dilution method. Results: All the compounds moderately inhibited the growth of Gram positive and Gram negative bacteria. In the present study among all Schiff bases 2-(2'-hydroxy)benzylideneaminonaphthothiazole showed maximum inhibitory activity and among metal complexes Cu(II) metal complex was found to be most potent. Conclusion: The results obtained validate the hypothesis that Schiff bases having substitution with halogens, hydroxyl group and nitro group at phenyl ring are required for the antibacterial activity while methoxy group at different positions in the aromatic ring has minimal role in the inhibitory activity. The results also indicated that the metal complexes are better antibacterial agents as compared to the Schiff bases.

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“…The enormous majority of publications on oximate complexes during last 15 years have dealt with the synthesis and study of magnetic properties of polynuclear l-oximato complexes. This is due to the prominent capacity of the bridging N,O-oxime function to mediate very efficiently exchange interactions between paramagnetic metal ions; in some dicopper(II) l-oximate complexes the exchange parameters (2J) reach the value À1000 cm À1 and even higher [4][5][6].…”

Section: Introductionmentioning

confidence: 98%

Syntheses, characterization and X-ray crystal structures of a mono- and a penta-nuclear nickel(II) complex with oximato Schiff base ligands

Maity

Chattopadhyay

Ghosh

et al. 2011

Inorganica Chimica Acta

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Tuning the nature of the exchange interaction in out-of-plane oximato-bridged dinuclear copper(II) complexes

Cited by 86 publications

References 27 publications

Synthesis of Schiff bases of naphtha[1,2-d]thiazol-2-amine and metal complexes of 2-(2′-hydroxy)benzylideneaminonaphthothiazole as potential antimicrobial agents

Syntheses, characterization and X-ray crystal structures of a mono- and a penta-nuclear nickel(II) complex with oximato Schiff base ligands

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