A double helical dicopper(II) complex with biacetyl bis(benzoylhydrazone)

Ghosh, Tulika; Pal, Samudranil

doi:10.1016/j.ica.2010.07.007

Cited by 10 publications

(7 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The broad band is centered at 410 nm for the dinuclear complex and two bands at 547 and 423 nm for the mononuclear complex are attributed to LMCT transitions. 21 The Fig. 2 and Table 2.…”

Section: Characterization Of the Complexmentioning

confidence: 99%

“…Helical structures are often formed via a self-assembly process by ligands that connect two or more bidentate coordinating units with appropriate spacers and two or more metal ions. [19][20][21] Herein, we have described the synthesis and crystal structures of a dinuclear copper(II) complex double helicates with the tetradentate N 2 O 2 -donor ligand biacetyl bis(benzoylhydrazone), H 2 babh (Scheme 1). Also, the structure of the complex is compared with mono-and dinuclear copper(II) complexes that have been previously reported with the H 2 babh ligand.…”

Section: Introductionmentioning

confidence: 99%

“…Also, the structure of the complex is compared with mono-and dinuclear copper(II) complexes that have been previously reported with the H 2 babh ligand. 21,22 2. Experimental…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and Structural Characterization of a Double Helical Dinuclear Copper(II) Complex With Tetradentate Biacetyl Bis(benzoylhydrazone)

Vafazadeh

Abdollahi²,

Willis³

2017

ACSi

View full text Add to dashboard Cite

The reaction of tetradentate hydrazone ligand H 2 babh with Cu(CH 3 COO) 2 in methanol solvent leads to the formation of the mono-nuclear complex [Cu(babh)]. However, on being dissolved in dichloromethane solvent and on addition of ethanol solvent, a dinuclear complex of [Cu 2 (μ 1,3 -babh) 2 (C 2 H 5 OH) 2 ] is obtained. The X-ray crystallography indicates that the dinuclear helical complex formation is caused due to the unsymmetrical twisting of the H 2 babh ligand. One oxygen and two nitrogen atoms from the ligand and one oxygen atom from the other ligand coordinate to each copper(II) center. Both the copper(II) centers in a dinuclear unit are penta-coordinate with a slightly distorted square pyramidal geometry. The IR spectra of mono-and dinuclear copper(II) complexes have different bands. The absorption spectra of mono-and di-nuclear complexes are quite similar in methanol solvent. However, the electronic absorption spectra of the two complexes are basically different in the solid state.

show abstract

“…The broad band is centered at 410 nm for the dinuclear complex and two bands at 547 and 423 nm for the mononuclear complex are attributed to LMCT transitions. 21 The Fig. 2 and Table 2.…”

Section: Characterization Of the Complexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Structural Characterization of a Double Helical Dinuclear Copper(II) Complex With Tetradentate Biacetyl Bis(benzoylhydrazone)

Vafazadeh

Abdollahi²,

Willis³

2017

ACSi

View full text Add to dashboard Cite

show abstract

“…Recently, we have reported two mononuclear complexes of nickel(II) and copper(II) and a double helical dicopper(II) complex with the tetradentate Schiff base biacetyl bis(benzoylhydrazone) (H 2 babh, 2 H's represent the two dissociable amide protons). 23,24 In the mononuclear complexes, the dianionic ligand (babh 2− ) provides the expected N 2 O 2 square-plane around the metal centre and forms 5,5,5-membered fused chelate rings. 23 On the other hand, each bridging ligand in [Cu 2 (μ-babh) 2 ] is twisted along the single bond of its =(CH 3 )C−C(CH 3 )= fragment to accommodate the two metal centres.…”

Section: Introductionmentioning

confidence: 99%

“…23 On the other hand, each bridging ligand in [Cu 2 (μ-babh) 2 ] is twisted along the single bond of its =(CH 3 )C−C(CH 3 )= fragment to accommodate the two metal centres. 24 Thus, apparently rigid babh 2− is rather flexible and can adopt an unusual bridging coordination mode to provide the double helical motif of the dicopper(II) complex. Since lanthanide ions can have high (> 6) coordination numbers and hence unusual coordination geometries, complexes of them with not so rigid tetradentate babh 2− is anticipated to be interesting.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of dodecahedral cerium(IV) and gadolinium(III) complexes with a tetradentate Schiff Base

Ghosh

Pal

2015

J Chem Sci

Self Cite

View full text Add to dashboard Cite

Reactions of CeCl 3 •6H 2 O and Gd(NO 3) 3 •5H 2 O with biacetyl bis(benzoylhydrazone) (H 2 babh) and KOH in 1:2:2 mole ratio in methanol afford the complexes [Ce(babh) 2 ](1) and [Gd(babh)(Hbabh)]•H 2 O (2•H 2 O), respectively in good yields. Characterization of the complexes has been performed with the help of elemental analysis, magnetic susceptibility, spectroscopic (IR, UV-Vis, EPR and NMR) and X-ray crystallographic measurements. 1 is diamagnetic and NMR active, while 2•H 2 O is paramagnetic (μ eff = 8.03 μ B at 300 K) and EPR active. The complexes crystallize as 1•CH 2 Cl 2 and 2•H 2 O. X-ray structures show that the metal centre in each of 1 and 2 is in a distorted dodecahedral N 4 O 4 coordination sphere assembled by two meridionally spanning ONNO-donor ligands. Self-assembly of 1•CH 2 Cl 2 via intermolecular C−H•••N and C−H•••Cl hydrogen bonds and π-π interactions provides one-dimensional 'ladder' type structure. On the other hand, 2•H 2 O assembles into a two-dimensional 'sheet' like network through intermolecular N−H•••O and O−H•••N hydrogen bonds.

show abstract

Syntheses, Crystal Structure, and Magnetic Properties of a Self‐assembling Dicopper(II) Helicate with Novel Bipyridine Ligand

Wang¹,

Wang²,

Kao³

2012

J Chinese Chemical Soc

View full text Add to dashboard Cite

A novel double helical dicopper(II) complex was synthesized by reaction of a polydentate ligand L = 2,2¢bipyridyl-6,6¢-bis(2-acetylpyrazinohydrazone) with copper(II) perchlorate in CH 3 CN. The self-assembling process was studied by UV-Vis spectrometric titration experiments which revealed the formation of dinuclear complexes [Cu 2 L 2 ](ClO 4 ) 4 . The structure of dicopper double-helicate was confirmed by X-ray diffractometry. Each copper(II) center occupies a distorted octahedral environment. Variable-temperature magnetic measurements reveal weak antiferromagnetic interactions between Cu(II) ion centers with J = -0.63 cm -1 .

show abstract

A double helical dicopper(II) complex with biacetyl bis(benzoylhydrazone)

Cited by 10 publications

References 40 publications

Synthesis and Structural Characterization of a Double Helical Dinuclear Copper(II) Complex With Tetradentate Biacetyl Bis(benzoylhydrazone)

Synthesis and Structural Characterization of a Double Helical Dinuclear Copper(II) Complex With Tetradentate Biacetyl Bis(benzoylhydrazone)

Synthesis and characterization of dodecahedral cerium(IV) and gadolinium(III) complexes with a tetradentate Schiff Base

Syntheses, Crystal Structure, and Magnetic Properties of a Self‐assembling Dicopper(II) Helicate with Novel Bipyridine Ligand

Contact Info

Product

Resources

About