Macrocyclic heterodinuclear NiMn and CuMn complexes: crystal structure and electrochemical behaviour

Wada, Hisae; Aono, Takanori; Motoda, Ken Ichiro; Ohba, Masaaki; Matsumoto, Naohide; Ökawa, Hisashi

doi:10.1016/0020-1693(96)05045-1

Cited by 38 publications

(13 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our research has continued on bis-hydrazones with glyoxal, biacetyl and benzil with 2,6-diformyl-4-methylphenol. Many binuclear metal complexes have been studied extensively as phenoxo bridged acyclic and macrocyclic complexes of 2,6-diformyl-4-methylphenol, which have specific electric, magnetic, optical and catalytic properties [12,[14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, spectral characterization and in vitro microbiological evaluation of novel glyoxal, biacetyl and benzil bis-hydrazone macrocyclic Schiff bases and their Co(II), Ni(II) and Cu(II) complexes

et al. 2011

View full text Add to dashboard Cite

A series of binuclear Co(II), Ni(II) and Cu(II) complexes were synthesized by the template condensation of glyoxal, biacetyl or benzil bis-hydrazide, 2,6-diformyl-4-methylphenol and Co(II), Ni(II) or Cu(II) chloride in a 2:2:2 M ratio in ethanol. These 22-membered macrocyclic complexes were characterized by elemental analyses, magnetic, molar conductance, spectral, thermal and fluorescence studies. Elemental analyses suggest the complexes have a 2:1 stoichiometry of the type [M 2 LX 2 ]ÁnH 2 O and [Ni 2 LX 2 2H 2 O]ÁnH 2 O(where M = Co(II) and Cu(II); L = H 2 L 1 , H 2 L 2 and H 2 L 3 ; X = Cl; n = 2). From the spectroscopic and magnetic studies, it has been concluded that the Co(II) and Cu(II) complexes display a five coordinated square pyramidal geometry and the Ni(II) complexes have a six coordinated octahedral geometry. The Schiff bases and their metal complexes have also been screened for their antibacterial and antifungal activities by the MIC method.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis, spectral characterization and in vitro microbiological evaluation of novel glyoxal, biacetyl and benzil bis-hydrazone macrocyclic Schiff bases and their Co(II), Ni(II) and Cu(II) complexes

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Splitting is due to coordinated perchlorate, while the other peak indicates uncoordinated perchlorate ion [21]. Apart from this an additional peak is observed in the range 624-630 cm À1 , characteristic for perchlorate [22] bending, and does not show any splitting even if it coordinates. New bands from 1530-1558 cm À1 in all the complexes suggest bridging phenoxide [23].…”

Section: Spectroscopic Studiesmentioning

confidence: 85%

“…The red shift of the d-d transition of copper(II) for L 1a to L 1c and L 1d to L 1e indicates that the coordination geometry around copper is distorted. This is due to the flexibility of the macrocyclic ring upon increasing the chain length of the imine compartment, causing more distortion [21,22]. …”

Section: N-functionalized Cyclam 3077mentioning

confidence: 98%

N-functionalized, cyclam-based unsymmetrical dicompartmental binuclear copper(II) complexes containing 4- and 6-coordination sites: electrochemical, magnetic, catalytic, and antimicrobial studies

Sreedaran

Bharathi

Rahiman

et al. 2009

Journal of Coordination Chemistry

View full text Add to dashboard Cite

A series of unsymmetrical dicompartmental binuclear copper(II) complexes have been prepared by Schiff-base condensation of 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclotetradecane (L) with aliphatic and aromatic diamines, copper(II) perchlorate and triethylamine. The complexes were characterized by elemental and spectral analysis. Electronic spectra of the complexes show d-d transitions in the range 663-786 nm. Electrochemical studies of the complexes in DMF show two irreversible one electron reduction processes E 1 pc ¼ À0.62 to À0.77 V and E 2 pc ¼ À0.94 to À1.17 V. Cryomagnetic investigations of the binuclear complexes show À2J values in the range of 154 to 236 cm À1 . The rate constants for hydrolysis of 4-nitrophenylphosphate are in the range of 2.27 Â 10 À2 to 9.21 Â 10 À2 min À1 and for catecholase activity in the range of 3.06 Â 10 À2 to 8.35 Â 10 À2 min À1 . All the complexes were screened for antifungal and antibacterial activity.

show abstract

“…No splitting of the ν 3 mode means that the Perchlorate group is free from coordination. 7 Strong absorption at 1648 and 1624 cm −1 of complexes [Ni 2 L 1 ](ClO 4 ) 2 and [Ni 2 L 2 ](ClO 4 ) 2 could be assigned as the stretching band of C N double band within the ligands, respectively. 4 Both dinuclear complexes were found to be diamagnetic (µ = 0.0 BM in both cases), which is consistent with a square planar nickel(II) formation and the nickel(II) ions being assumed to be low spin states.…”

Section: F Farsavi and H Golchoubianmentioning

confidence: 98%

Synthesis of Dinuclear Thiolate-Bridged Macrocyclic Nickel(II) Complexes with C₂ Linker Diimine

Farsavi

Golchoubian

2006

Phosphorus, Sulfur, and Silicon and the Related Elements

View full text Add to dashboard Cite

show abstract

Macrocyclic heterodinuclear NiMn and CuMn complexes: crystal structure and electrochemical behaviour

Cited by 38 publications

References 48 publications

Synthesis, spectral characterization and in vitro microbiological evaluation of novel glyoxal, biacetyl and benzil bis-hydrazone macrocyclic Schiff bases and their Co(II), Ni(II) and Cu(II) complexes

Synthesis, spectral characterization and in vitro microbiological evaluation of novel glyoxal, biacetyl and benzil bis-hydrazone macrocyclic Schiff bases and their Co(II), Ni(II) and Cu(II) complexes

N-functionalized, cyclam-based unsymmetrical dicompartmental binuclear copper(II) complexes containing 4- and 6-coordination sites: electrochemical, magnetic, catalytic, and antimicrobial studies

Synthesis of Dinuclear Thiolate-Bridged Macrocyclic Nickel(II) Complexes with C₂ Linker Diimine

Contact Info

Product

Resources

About

Macrocyclic heterodinuclear NiMn and CuMn complexes: crystal structure and electrochemical behaviour

Cited by 38 publications

References 48 publications

Synthesis, spectral characterization and in vitro microbiological evaluation of novel glyoxal, biacetyl and benzil bis-hydrazone macrocyclic Schiff bases and their Co(II), Ni(II) and Cu(II) complexes

Synthesis, spectral characterization and in vitro microbiological evaluation of novel glyoxal, biacetyl and benzil bis-hydrazone macrocyclic Schiff bases and their Co(II), Ni(II) and Cu(II) complexes

N-functionalized, cyclam-based unsymmetrical dicompartmental binuclear copper(II) complexes containing 4- and 6-coordination sites: electrochemical, magnetic, catalytic, and antimicrobial studies

Synthesis of Dinuclear Thiolate-Bridged Macrocyclic Nickel(II) Complexes with C2 Linker Diimine

Contact Info

Product

Resources

About

Synthesis of Dinuclear Thiolate-Bridged Macrocyclic Nickel(II) Complexes with C₂ Linker Diimine