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1.
Kalagouda B. Gudasi Manjula S. Patil Ramesh S. Vadavi Rashmi V. Shenoy Siddappa A. Patil 《Transition Metal Chemistry》2006,31(8):986-991
A new tetradentate NOOO-donor ligand, N-(salicylidene)nitrosophenylglycine (H2snpg) has been designed, synthesized and structurally characterized. Copper(II), nickel(II), cobalt(II), manganese(II) and
zinc(II) complexes of H2snpg have been prepared for the first time. The authenticities of the ligand and its metal complexes have been established
on the basis of elemental analyses, molar conductance measurements, magnetic properties, spectral (i.r., 1H-n.m.r., u.v.–vis. and mass) studies. The i.r. spectral studies of all the complexes exhibit a similar feature about the
ligating nature of the ligand to the metal ions and revealed that the ligand has coordinated through the carbonyl oxygen,
azomethine nitrogen, nitroso oxygen and deprotonated hydroxyl oxygen. The molar conductance data suggest them to be non-electrolytes.
The antimicrobial activity of all the compounds was studied against Escherichia coli, Bacillus cirroflagellosus, Aspergillus niger and Candida albicans. All the complexes have shown a moderate to high fungal activity compared to the ligand. 相似文献
2.
A novel tetradentate nitrogen donor [N4] macrocyclic ligand, i.e. 3,5,13,15,21,22-hexaaza-2,6,12,16-tetramethyl-4,14-dithia-tricyclo[15.3.1.1(7–11)]docosane-1(21),2,5,7,9,11(22),12,15,17,19-decaene,
has been synthesized. Mn(II), Co(II), Ni(II) and Cu(II) complexes with this ligand have been prepared and subjected to elemental
analyses, molar conductance measurements, magnetic susceptibility measurements, mass, 1H-n.m.r. (Ligand), i.r., electronic, and e.p.r. spectral studies. On the basis of molar conductance the complexes may be formulated
as [M(L)X2] and [Ni(L)]X2 [where M = Mn(II), Co(II) and Cu(II), and X = Cl− and NO3−] due to their nonelectrolytic nature in dimethylsulphoxide (DMSO). All the complexes are of the high spin type and are six
coordinated. On the basis of i.r., electronic and e.p.r. spectral studies an octahedral geometry has been assigned to Mn(II)
and Co(II), square planar for Ni(II) complexes, and tetragonal for Cu(II) complexes. The antimicrobial activities of the ligand
and its complexes, as growth inhibiting agents, have been screened in vitro against several species of bacteria and plant pathogenic fungi. 相似文献
3.
A novel tetradentate nitrogen donor [N4] macrocyclic ligand, i.e. 1,3,4,8,9,11-hexaaza-2,5,10,12-tetraoxo-7,14-diphenyl-cyclotetradecane (L), has been synthesized. Mn(II), Co(II), Ni(II)
and Cu(II) complexes of this ligand have been prepared and subjected to elemental analyses, molar conductance measurements,
magnetic susceptibility measurements, mass, 1H-n.m.r. (Ligand), i.r., electronic, and e.p.r. spectral studies. On the basis of molar conductance the Mn(II), Co(II) and
Cu(II) complexes may be formulated as [M(L)X2] [where X = Cl− & NO
3
−
] due to their non-electrolytic nature in dimethylformamide (DMF). Whereas the Ni(II) complexes are 1:2 electrolytes and formulated
as [Ni(L)]X2. All the complexes are of the high spin type and are six/four coordinate. On the basis of i.r., electronic and e.p.r. spectral
studies an octahedral geometry has been assigned to Mn(II) and Co(II), square planar for Ni(II) complexes, and tetragonal
for Cu(II) complexes. The antimicrobial activities of the ligand and its complexes, as growth inhibiting agents, have been
screened in vitro against several species of bacteria and plant pathogenic fungi. 相似文献
4.
Cobalt(II), nickel(II) and copper(II) complexes are synthesized with 1,3,7,9-tetraaza- 4,6,10,12-tetraphenyl-2,8-dithiacyclododecane,
a tetradentate ligand (L) and characterized by elemental analysis, molar conductance measurements, magnetic susceptibitity
measurements, mass, i.r., electronic and e.p.r. spectral studies. All the complexes are non-electrolytes so they may be formulated
as [M(L)X2] [where, M = Co(II), Ni(II) and Cu(II) and X = Cl− and NO
3
−
]. All the complexes are of high spin type. On the basis of i.r., electronic and e.p.r. spectral studies an octahedral geometry
has been assigned for Co(II) and Ni(II) complexes and tetragonal geometry for Cu(II) complexes. The antimicrobial activities
of the ligand and its complexes, as growth inhibiting agents, have been screened in vitro against two different species of bacteria and plant pathogenic fungi. 相似文献
5.
A novel tetradentate nitrogen donor [N4] macrocyclic ligand, i.e. 1,3,4,8,9,11-hexaaza-2,10-dithia-5,12-dioxo-7,14-diphenyl-cyclotetradecane (L), has been synthesized. Manganese(II),cobalt(II),
nickel(II) and copper(II) complexes with this ligand have been prepared and subjected to elemental analyses, molar conductance
measurements, magnetic susceptibility measurements, mass, 1H-n.m.r. (Ligand), i.r., electronic, and e.p.r. spectral studies. On the basis of molar conductance the complexes may be formulated
as [M(L)X2] [where M = MnII, CoII, NiII, and CoII,and X = Cl− & NO
3
−
] due to their nonelectrolytic nature in dimethylformamide (DMF). All the complexes are of the high spin type and are six
coordinated. On the basis of i.r., electronic and e.p.r. spectral studies an octahedral geometry has been assigned to MnII, and II, II, complexes, and tetragonal for copper(II) complexes. The antimicrobial activities of the ligand and its complexes, as growth
inhibiting agents, have been screened in vitro against several species of bacteria and plant pathogenic fungi. 相似文献
6.
The synthesis of a tetradentate nitrogen donor macrocyclic ligand i.e. 2,5,11,14,19,20-hexaaza-3,12-dimethyl-4,13-dipropyl-tricyclo[13.3.1.1(6-10)]cosane-1(19),2,4,6(20),7,9,11,13,15,17-decaene and its complexes with manganese(II), cobalt(II), nickel(II) and copper(II) have been reported. The complexes were characterized by elemental analyses, molar conductance measurements, magnetic susceptibility measurements, mass, 1H-n.m.r. (Ligand), i.r., electronic, and e.p.r. spectral studies. On the basis of molar conductance the complexes may be formulated as [M(L)X2] [where M = Mn(II), Co(II), Ni(II) and Cu(II), and X = Cl− & NO 3− ] due to their nonelectrolytic nature in dimethylformamide (DMF). All the complexes are of the high spin type and are six coordinated. On the basis of i.r., electronic and e.p.r. spectral studies an octahedral geometry has been deduced for Mn(II), Co(II) and Ni(II) complexes, and tetragonal geometry for Cu(II) complexes. The antimicrobial activities of the ligand and its complexes, as growth inhibiting agents, have been screened in vitro against several species of bacteria and plant pathogenic fungi. 相似文献
7.
Synthesis,characterization and antifungal activity of glycylglycine Schiff base complexes of 3d transition metal ions 总被引:1,自引:0,他引:1
Summary Two new Schiff bases, N-4-hydroxysalicylidene-glycylglycine (K·GGRS·H2O), N-O-vanillal-glycylglycine (K· GGVS·3H2O) and their manganese(II), cobalt(II), nickel(II) and copper(II) complexes have been synthesized and characterized by elemental analysis, t.g.a., molar conductance, i.r. and u.v. spectral studies. The 13Cn.m.r. spectrum of one of the Schiff base ligands has been recorded. The results show that the ligand is coordinated to the central metal ion via amide nitrogen, imino nitrogen, phenolic oxygen and carboxyl oxygen to form a quadridentate complexes. Some of the complexes exhibit strong inhibitory action towards Candida albicans and Cryptococcus neoformans. 相似文献
8.
Serbest Kerim Değirmencioğlu İsmail Karaböcek Serdar Güner Saadettin 《Transition Metal Chemistry》2001,26(1-2):232-236
A new binucleating ligand incorporating four oxime groups, butane-2,3-dione O-[4-aminooxy-2,3-bis-(2-hydroxyimino-1-methyl-propylideneaminooxymethyl)-but-2-enyl]-dioxime, (H4mto), has been synthesized and its dinuclear cobalt(III), copper(II), and homo- and hetero-tetranuclear copper(II)–manganese(II) complexes have been prepared and characterized by 1H- and 13C-n.m.r., i.r., magnetic moments and mass spectral studies. Elemental analyses, stoichiometric and spectroscopic data indicate that the metal ions in the complexes are coordinated to the oxime nitrogen atoms (C=N) and the data support the proposed structure for H4mto and its complexes. Moreover, dinuclear cobalt(III) and copper(II) complexes of H4mto have a 2:1 metal:ligand ratio. 相似文献
9.
Kalagouda B. Gudasi Ramesh S. Vadavi Rashmi V. Shenoy Siddappa A. Patil Munirathinam Nethaji 《Transition Metal Chemistry》2006,31(3):374-381
The synthesis of manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) complexes of a new ligand 2-thiophene-2-yl-3(thiophene-2-carboxylidene-amino)-1,2-dihydroquinazolin-4(3H)-one
(TTCADQ) is described. The ligand and metal complexes were characterized by elemental analysis, conductivity measurements,
spectral (u.v.–vis., i.r., 1D n.m.r., 2D hetcor and e.p.r.) and thermal studies. The formation of 1,2-dihydroquinazolin-4(3H)-one
rather than hydrazone, in the reaction of aromatic aldehyde and o-aminobenzoylhydrazide is proved by single crystal X-ray diffraction and 2D hetcor n.m.r. studies. On the basis of elemental
analysis, u.v.–vis.spectroscopy and magnetic moment studies, six coordinate geometry for all the complexes was proposed. The
i.r. spectral studies reveal the bidentate behaviour of the ligand. 相似文献
10.
Summary A new series of complexes with the tridentate dibasic Schiff base ligand o-vanillin isonicotinoyl hydrazone (o-VINH) were prepared and characterized by i.r., 1H n.m.r. and electronic spectral studies, magnetic susceptibility measurements and t.g.a. The disappearance of low field signals due to OH, NH protons at 10.23 and 9.31 p.p.m. and downfield shift of the –CH=N proton signal at 8.17 p.p.m. in the n.m.r. spectrum confirms the involvement of these groups in coordination. Both t.g.a. and i.r. spectral data show evidence for one molecule of coordinated H2O. These results taken in conjunction with electronic spectral data allow assignation of tetrahedral geometry for manganese(II), nickel(II) and palladium(II) complexes but a square planar configuration to cobalt(II), copper(II) amd zinc(II) complexes. 相似文献
11.
Vettaikaranpudur G. Gnanasoundari Karuppannan Natarajan 《Transition Metal Chemistry》2005,30(4):433-438
A series of new β-diketonato complexes have been synthesized from the reactions of iron(III), cobalt(II), nickel(II) and copper(II) Ph3P complexes with β-diketones (acetylacetone, benzoylacetone and dibenzoylmethane). All the complexes have been characterized by elemental analyses, spectral studies (i.r., electronic., magnetic., e.p.r., 1H-n.m.r.) and cyclic voltammetry. The new complexes have been used as catalysts for aromatic coupling and oxidation reactions. Higher catalytic activity has been observed for the nickel(II) complexes compared to the other complexes. 相似文献
12.
A bishydrazone was prepared by reacting isatin monohydrazone with 2-hydroxy-1-naphthaldehyde and a series of metal complexes
with this new ligand were synthesised by reaction with MnII, FeII, CoII, NiII, CuII and ZnII salts. The complexes were characterised on the basis of elemental analysis, molar conductance, magnetic susceptibility data,
u.v.–visible, i.r., e.s.r. and n.m.r. spectral studies, wherever possible and applicable. Analytical data reveal that the
nickel(II), copper(II) and zinc(II) complexes possess 1:1 metal–ligand ratios and that manganese(II), iron(II) and cobalt
(II) complexes exhibit 1:2 ratios. Infrared spectral data suggest that the bishydrazone behaves as a monobasic tridentate
ligand with ONO donor sequence towards the metal ions. X-ray diffraction study of the copper(II) complex indicated an orthorhombic
crystal lattice. The e.p.r. spectral data show that the metal–ligand bond has considerable covalent character. The electrochemical
behaviour of the copper(II) complex was investigated by cyclic voltammetry (CV). Antibacterial tests of the ligand and the
metal complexes were also carried out and it has been observed that the complexes are more potent bactericides than the ligand. 相似文献
13.
Karaböcek Serdar Değirmencioğlu İsmail Karaböcek Nevin Serbest Kerim 《Transition Metal Chemistry》2003,28(5):529-533
1,9-Dioxa-3,6-dithiacyclotridecane-10,12-dione (L1), and 1,4-dioxa-7,10-dithiacyclododecane-2,3-dione, (L2), two novel ligands, and their mono- and di-nuclear copper(II) and/or nickel(II) complexes have been prepared and characterized by elemental analyses, 1H- and 13C-n.m.r., i.r., magnetic moments and mass spectral studies. Elemental analyses, stochiometric and spectroscopic data on the complexes indicate that the metal ions are coordinated to the nitrogen, oxygen and sulphur atoms and the data support the proposed structure for the diones and their mono–dinuclear copper(II) complexes. Moreover, copper(II) complexes of the dione ligands have a 1:1 metal:ligand ratio. 相似文献
14.
A new dioxime ligand, (2E,3E)-3-[(6-{[(1E,2E)-2-(hydroxyimino)-1-methylpropylidene]amino}-pyridin-2-yl)imino]butan-2-one oxime, (H2Pymdo) (3) has been synthesized in H2O by reacting 2,3-butenedione monoxime (2) with 2,6-diaminopyridine. Mono-, di- and tri-nuclear copper(II) complexes of the dioxime ligand (H2Pymdo) and/or 1,10-phenanthroline have been prepared. The dioxime ligand (H2Pymdo) and its copper(II) complexes were characterized by 1H-n.m.r., 13C-n.m.r. and elemental analyses, magnetic moments, i.r. and mass spectral studies. The mononuclear copper(II) complex of H2Pymdo was found to have a 1:1 metal:ligand ratio. Elemental analyses, stoichiometric and spectroscopic data of the metal complexes
indicated that the metal ions are coordinated to the oxime and imine nitrogen atoms (C=N). In the dinuclear complexes, in
which the first Cu(II) ion was complexed with nitrogen atoms of the oxime and imine groups, the second Cu(II) ion is ligated
with dianionic oxygen atoms of the oxime groups and are linked to the 1,10-phenanthroline nitrogen atoms. The trinuclear copper(II)
complex (6) was formed by coordination of the third Cu(II) ion with dianionic oxygen atoms of each of two molecules of the mononuclear
copper(II) complexes. The data support the proposed structure of H2Pymdo and its Cu(II) complexes. 相似文献
15.
Summary The 4-hydroxyphenylthiocarboxyhydrazide (Hoth) ligand has been characterized by i.r.,1H and13C spectral studies. Its metal complexes with FeII, CoII,III, NiII, CuII and ZnII have been prepared and characterized on the basis of elemental analyses, molar conductance, magnetic susceptibility. Mössbauer, visible, e.s.r., i.r.,1H and13C n.m.r. spectral studies. The bonding and stereochemistry of the complexes are discussed. Hoth and its CuII complexes have been screened towards bacteria, viruses and fungi. 相似文献
16.
A new Schiff base, 2,6-diacetylpyridine bis(3-methylsulfhydryl-4-amino-5-mercapto-1,2,4-triazole) (DPMAMT) is designed and
synthesized by the condensation of 2,6-diacetylpyridine with 3-methylsulfhydryl-4-amino-5-mercapto-1,2,4-triazole, and structurally
characterized. Copper(II), cobalt(II), nickel(II), manganese(II), zinc(II), cadmium(II) and oxovanadium(IV) complexes of DPMAMT
have been prepared for the first time, and characterized on the basis of elemental analyses, conductance measurements, magnetic
properties, spectral (i.r., 1H-n.m.r., u.v.–vis., e.p.r. and FAB-mass) and thermal studies. The complexes exhibit an octahedral geometry around the metal
center. The pentadentate behavior of the ligand was confirmed on the basis of spectral studies. 相似文献
17.
《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1986,42(4):507-513
A new ONS donor ligand, N-salicyl-N′-2-furanthiocarboxy hydrazine (H2sfth) has been synthesized, characterized by i.r., 1H, 13C NMR and mass spectral studies and its VO(IV), Mn(II), Fe(II), CO(II), Ni(II) and Zn(II) chelates of the types M(Hsfth)2 and M(sfth) · nH2O, a new class of antitumour compounds, have been synthesized and authenticated by analytical data and by molar conductance, magnetic susceptibility and spectroscopic methods. Electronic, photoacoustic and Mössbauer spectra indicate highspin octahedral geometry for all the complexes. Infrared and PMR spectral studies imply mononegative tridentate and dinegative tetradentate behaviour of the ligand in 1 : 2 and 1 : 1 (polymeric) deprotonated complexes, respectively, the bonding sites being thione sulphur, phenolate oxygen and hydrazinic nitrogen in the former type and thiolo sulphur, enolic oxygen and both of the hydrazinic nitrogens in the latter type. The X-band ESR spectral data are further suggestive of two nitrogen coordination with a dXY ground state for vanadium in VO(sfth) · H2O and octahedral geometry for Mn(Hsfth)2. The ligand and its Cu(II) complex has been tested for antineoplastic activity, a full account of which together with the synthesis and characterization of the latter is to be published [1]. 相似文献
18.
A tetraazamacrocyclic ligand, L, containing six non-equivalent benzene rings, derived from the condensation of benzil with 1,2- diaminobenzene, has been isolated and its complexes [MLCl2] (M = Ni2+ and Cu2+) prepared and characterized by elemental analysis, i.r., u.v.–vis., e.p.r. spectral studies, magnetic moments, redox potentials and conductivity measurements. The complexes have axially elongated octahedral geometries with two axial chlorines, and adopt the trans-configuration. These studies also indicate the covalent nature and the high-spin octahedral structure for these complexes. A cyclic voltammetric investigation reveals that the complexes exhibit a single one-electron redox couple, as anticipated for a copper(II) complex (Cu2+/Cu+) and a single two-electron redox couple for a nickel(II) complex (Ni2+/Ni0). The electrochemical processes are considered quasi-reversible. Antimicrobial activities of the ligand and the complexes have been tested against Bacillus megaterium and Candida tropicallis. 相似文献
19.
Kalagouda B. Gudasi Siddappa A. Patil Ramesh S. Vadavi Rashmi V. Shenoy Munirathinam Nethaji 《Transition Metal Chemistry》2006,31(5):586-592
A new 1,2-dihydroquinazolin-4(3H)-one ligand, 2-[2-hydroxy-3-methoxyphenyl]-3-[2-hydroxy-3-methoxybenzylamino]-1,2-dihydroquinazolin-4(3H)-one
(Hmpbaq), formed by the condensation of 2-aminobenzoylhydrazide with 2-hydroxy-3-methoxybenzaldehyde and its copper(II), nickel(II),
cobalt(II), manganese(II), zinc(II) and cadmium(II) complexes, have been synthesized. Their structures have been elucidated
on the basis of elemental analyses, conductance measurements, magnetic moments, spectral (i.r., 1H-n.m.r., u.v.–vis., e.p.r. and FAB-mass) and thermal studies. The formation of 1,2-dihydroquinazolin-4(3H)-one rather than
hydrazone in the reaction of 2-aminobenzoylhydrazide with 2-hydroxy-3-methoxybenzaldehyde is confirmed by the 1H-n.m.r. spectra and single crystal X-ray diffraction studies. The tridentate behavior of the ligand was proposed on the basis
of spectral studies. X-band e.p.r. spectra of the copper(II) and manganese(II) complexes in the polycrystalline state at room
temperature and liquid nitrogen temperature were recorded and their salient features are reported. Thermal stabilities of
the manganese(II) and zinc(II) complexes have been studied. 相似文献
20.
Summary
o-Hydroxyacetophenone (N-benzoyl)glycyl hydrazone (o-HABzGH) has been characterized by i.r.,1H n.m.r.,13C n.m.r. and mass spectral studies, and its complexes of the types [Ln(o-HABzGH)Cl2(H2O)2]Cl and [Ln(o-HABzGH–2H)OH(H2O)3], where Ln=La, Pr, Nd, Sm and Eu, have been synthesized. The structures of the complexes have been studied by conductance, magnetic, electronic, i.r.,1H n.m.r. and13C n.m.r. spectral techniques. The hypersensitive bands of the electronic spectra suggest coordination numbers six and seven around NdIII in its adduct and neutral complexes respectively. I.r. and n.m.r. spectral data suggest a neutral bidentate behaviour for the ligand in the adducts and a dinegative tridentate nature in the neutral complexes. 相似文献