Synthesis, spectral and biological studies of nitrogen–sulphur donor macrocyclic ligands and their transition metals complexes

Verma, Shweta; Chandra, Sulekh; Dev, Usha; Joshi, Nidhi

doi:10.1016/j.saa.2009.06.029

Cited by 23 publications

(13 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DMSO is an aggressive solvent, so solvolysis of the complex and a change in coordination geometry in that solvent is not unreasonable. The spectrum of compound 4 does not show any anisotropic feature and hyperfine splittings, which may be due to poor glass formation, while 5 and 6 were found to be axial in nature with four hyperfine splittings due to the coupling of the electron spin with the nuclear spin of 63 Cu (I = 3/2) with different g || and g ⊥ values consistent with a d x 2 −y 2 ground state with an elongated octahedral geometry [42,43].…”

Section: Epr Spectramentioning

confidence: 99%

Versatile binding properties of a di-2-pyridyl ketone nicotinoylhydrazone ligand: Crystal structure of a Cu(II) complex

Mangalam

Kurup

2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

View full text Add to dashboard Cite

Six new copper complexes of di-2-pyridyl ketone nicotinoylhydrazone (HDKN) have been synthesized. The complexes have been characterized by a variety of spectroscopic techniques and the structure of [Cu(DKN)(2)]·H(2)O has been determined by single crystal X-ray diffraction. The compound [Cu(DKN)(2)]·H(2)O crystallized in the monoclinic space group P2(1) and has a distorted octahedral geometry. The IR spectra revealed the presence of variable modes of chelation for the investigated ligand. The EPR spectra of compounds [Cu(2)(DKN)(2)(μ-N(3))(2)] and [Cu(2)(DKN)(2)(μ-NCS)(2)] in polycrystalline state suggest a dimeric structure as they exhibited a half field signal, which indicate the presence of a weak interaction between two Cu(II) ions in these complexes.

show abstract

Section: Epr Spectramentioning

confidence: 99%

Versatile binding properties of a di-2-pyridyl ketone nicotinoylhydrazone ligand: Crystal structure of a Cu(II) complex

Mangalam

Kurup

2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

View full text Add to dashboard Cite

show abstract

“…The electronic spectrum of the Ni(II) complex in CH 3 CN shows an absorption bands at the 402, 606 and 877 nm attributed to d-d transitions. These are assigned to the spin-allowed transitions 3 A 2g (F)→ 3 T 1g (P), 3 A 2g (F)→ 3 T 1g (F) and 3 A 2g (F)→ 3 T 2g (F) respectively, consistent with their well-defined octahedral configuration. The reflectance spectrum in the visible region shows bands at 410, 610 and 870 nm.…”

Section: Spectral Propertiesmentioning

confidence: 89%

“…2 Many of them have been examined because of their potential as dyestuffs or pigments. 3 Some of them are involved in a number of biological processes such as photosynthesis and dioxygen transport, 4 and also have high potential in antitumor therapy. 5 The formation of macrocyclic complexes depends significantly on the dimension of the internal cavity, on the rigidity of the macrocycles, on the nature of its donor atoms and on the complexing properties of the anion involved in the coordination.…”

Section: Introductionmentioning

confidence: 99%

New mixed-ligand Ni(II) and Zn(II) macrocyclic complexes with bridged (endo,endo)-bicyclo [2.2.1]hept-5-ene-2,3-dicarboxylate: Synthesis, characterization, antimicrobial and cytotoxic activity

Nikolić¹,

Dražić²,

Antić-Stanković³

et al. 2019

JSCS

View full text Add to dashboard Cite

New carboxylate complexes of the tetraazamacrocyclic ligand N,N',N'',N'''-tetrakis(2-pyridilmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) with Ni(II) and Zn(II) as central ions were prepared. In mixed-ligand complexes (endo,endo)-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate dianion (C 9 H 8 O 4 2-) is also coordinated to metal ions. The complexes were characterized by elemental analysis (C, H, N), FTIR and UV-Vis spectroscopy, molar conductivity determination and magnetic susceptibility measurement at room temperature. The analytical data of the complexes show the formation of binuclear [Ni 2 (C 9 H 8 O 4)tpmc](ClO 4) 2 •4H 2 O and tetranuclear [Zn 4 (C 9 H 8 O 4)(tpmc) 2 ](ClO 4) 6 • •CH 3 CN•KClO 4 •4H 2 O complexes. In tetranuclear Zn(II) complex bicyclic dicarboxylate ligand is most likely to be bridge coordinated, and in binuclear Ni(II) complex it is coordinated in a combined bridged manner with chelate rings formation. In both complexes macrocyclic ligand was exo coordinated, out of cyclam ring and adopts a boat conformation. The Zn(II) complex is one of the rare tetranuclear Zn(II)-tpmc complexes with carboxylate ion bridging two Zn 2 tpmc units. The complexes were tested for antibacterial activity against Gram-positive bacteria Staphylococcus aureus (ATCC 25923) and Bacillus subtilis (ATCC 6633), Gram-negative bacterium Escherichia coli (ATCC 25922), and yeast Candida albicans (ATCC 10231), and were screened for antiproliferative activity against human cervix adenocarcinoma (HeLa) and human myelogenous leukemia (K562) cell lines.

show abstract

“…The e.p.r spectra of the polycrystalline complexes under study 28 were recorded at liquid nitrogen temperature (LNT). The rapid spin lattice relaxation of Co 2+ broadens the lines at higher temperatures.…”

Section: Eprmentioning

confidence: 99%

Biological Studies, Synthesis and Spectral Characterization of Nitrogen Donor Macrocyclic Co(II) Complexes

Kataria¹,

BHAYANA²

2017

juc

View full text Add to dashboard Cite

New Co(II) complexes with macrocyclic ligands 2, 7, 9, 14-tetrahydroxy phenyl-1, 3, 6, 8, 10, 13-hexaazacyclooctadecane (L 1 ), 2, 7, 9, 14-tetracyclohexane-1, 3, 6, 8, 10, 13-hexaazacyclo octadecane(L 2 ) have been synthesized by template method. The structure of complexes was determined by elemental analysis, molar conductance measurements, magnetic susceptibility measurements, IR and electronic spectral studies. Based on the analytical analysis i.e. molar conductance the complexes were found to be non-electrolytic in nature except the complexes [Co(L . Magnetic moment and the electronic spectra of the complexes suggest that the ligands coordinate to metal ion via four donor sites to give six coordinate complexes having octahedral geometry except [Co(L 1,2 )] (NO 3 ) 2 ] which is four coordinated tetrahedral geometry. Food Poison Technique was employed for screening the in vitro antifungal studies of the complexes. The complexes were also examined for antifungal studies against pathogenic strains like Alternaria brassicae, Fusarium moniliformae, Rhizoctonia solani.

show abstract

Synthesis, spectral and biological studies of nitrogen–sulphur donor macrocyclic ligands and their transition metals complexes

Cited by 23 publications

References 19 publications

Versatile binding properties of a di-2-pyridyl ketone nicotinoylhydrazone ligand: Crystal structure of a Cu(II) complex

Versatile binding properties of a di-2-pyridyl ketone nicotinoylhydrazone ligand: Crystal structure of a Cu(II) complex

New mixed-ligand Ni(II) and Zn(II) macrocyclic complexes with bridged (endo,endo)-bicyclo [2.2.1]hept-5-ene-2,3-dicarboxylate: Synthesis, characterization, antimicrobial and cytotoxic activity

Biological Studies, Synthesis and Spectral Characterization of Nitrogen Donor Macrocyclic Co(II) Complexes

Contact Info

Product

Resources

About