Synthesis, structural characterization and biological properties of Cu(II), Ni(II), Mn(II), Zn(II) and VO(II) complexes of tetradentate Schiff bases

New binucleating Cu(II), Ni(II), Mn(II), Zn(II) and VO(II) complexes of the prepared ligands with N4 donor were synthesized. The ligands are obtained by the condensation of para-phenylenediamine with diacetylmonoxime and benzilmonoxime. The synthesized ligands and their metal complexes were characterized by elemental analysis and various spectroscopic techniques. The Cu(II), Ni(II) complexes were square planar, VO(II) complex was square pyramidal, whereas Mn(II), Zn(II) complexes were of tedrahedral geometry. Both the ligands and their metal complexes were screened for their antibacterial and antifungal activities by minimum inhibitory concentration method. The results showed that the metal complexes were found to be more active than free ligand. The DNA binding capacities of all the complexes were analyzed by using UV absorption spectra. The DNA cleaving capacities of all complexes were analyzed by agarose gel electrophoresis method against pBR322 DNA

Synthesis, spectral characterization, electrochemical and anti-microbial activities of new binuclear Schiff base metal complexes derived from 3,3’ diaminobenzedine

A novel oxime ligand has been synthesized by refluxing 3,3’-diaminobenzedine and phthalaldehyde monoxime. Copper (II), cobalt (II), nickel (II) and manganese (II) binuclear complexes of this ligand have been prepared and characterized by using elemental analysis, molar conductance studies, IR, UV, NMR, EPR and magnetic studies. The molar conductance measurements correspond to a non-electrolytic nature for all complexes which can be formulated as [M2(L)X4] (Where M = Cu(II), Ni(II), Co(II) and Mn(II); X = Cl−). The UV-visible spectra of all the complexes are well characterized by broad weak d-d band and a high intensity charge-transfer transition. Thermal studies supported the chemical formation of these complexes showed that they decomposed in three or four stages depending on the type of ligand. The far-IR spectrum confirms the presence of coordinate chloride ion in all the complexes as evidenced by one intense far IR bands around 310-330 cm−1. In electrochemical studies the resulting cyclic voltammogram consists of single quasi-reversible one electron transfer. The ligand and complexes have been screened for their antimicrobial activity against two Gram-positive bacteria, two Gram-negative bacteria and fungi. The binuclear metal complexes were found to possess potent antimicrobial, antifungal activity better than ligand alone

Synthesis, spectral elucidation, antibacterial, antioxidant and DNA studies of ONNO tetradentate Schiff base metal(II) complexes derived from Benzene-1,4-dicarboxaldehyde

The new dibasic tetradentate (ONNO) Schiff base ligands (L1and L2) have been synthesized by the reaction of terephthalaldehyde with 2-amino 4-chlorophenol and X (where, X=2-amino 4-ethylphenol, 2-aminophenol) in 1:1:1 molar ratio. The macrocyclic binuclear Co(II), Ni(II) and Cu((II) metal complexes are prepared in ligand to metal ratio 2:2. The elements, metal structure and binding sites of Schiff bases and its complexes are established by diverse studies like elemental, molar conductance, UV, magnetic moment, FT-IR, H1 and C13 NMR, ESI-mass, ESR, thermal and powder-XRD. The spectral studies reveal that the ligands are tetradentate and its metal complexes possess a square planar geometry. All the compounds are screened for antibacterial, antioxidant and DNA cleavage and the results show high activity for metal complexes than the ligand. The DNA binding studies of Cu(II) complexes were measured by electronic absorption method. In vitro cytotoxicity assay of Cu(II) complexes have been tested for their tumour inhibiting potential against MCF-7 human breast cancer cell by using MTT method

Synthesis, spectral elucidation, antibacterial, antioxidant and DNA studies of ONNO tetradentate Schiff base metal(II) complexes derived from Benzene-1,4-dicarboxaldehyde

682-691The new dibasic tetradentate (ONNO) Schiff base ligands (L1and L2) have been synthesized by the reaction of terephthalaldehyde with 2-amino 4-chlorophenol and X (where, X=2-amino 4-methylphenol, 2-aminophenol) in 1:1:1 molar ratio. The macrocyclic binuclear Co(II), Ni(II) and Cu((II) metal complexes are prepared in ligand to metal ratio 2:2. The elements, metal structure and binding sites of Schiff bases and its complexes are established by diverse studies like elemental, molar conductance, UV, magnetic moment, FT-IR, H1 and C13 NMR, ESI-mass, ESR, thermal and powder-XRD. The spectral studies reveal that the ligands are tetradentate and its metal complexes possess a square planar geometry. All the compounds are screened for antibacterial, antioxidant and DNA cleavage and the results show high activity for metal complexes than the ligand. The DNA binding studies of Cu(II) complexes were measured by electronic absorption method. In vitro cytotoxicity assay of Cu(II) complexes have been tested for their tumour inhibiting potential against MCF-7 human breast cancer cell by using MTT method

Synthesis, characterization, biological activities of Schiff base metal(II) complexes derived from 4-hydroxy-3,5-dimethoxybenzaldehyde and 3-aminoquinoline

1427-1436A new Schiff base ligand (E)-2,6-dimethoxy-4-((quinolin-3-ylimino)methyl)phenol (HL) and its Cu(II), Co(II), Ni(II) and Zn(II) metal complexes have been synthesized and characterized by various spectroscopic (UV-visible, IR, NMR and mass), SEM and magnetic susceptibility measurement. The ligand (HL) have been synthesized by condensation of 4-hydroxy-3,5-dimethoxybenzaldehyde and 3-aminoquinoline. Based on electronic spectral data and magnetic susceptibility measurement the tetrahedral geometry is proposed for all the complexes. The ligand and metal complexes are screened for their antimicrobial activities against bacteria (Staphylococcus aureus, Escherichia coli) and antifungal activity against the fungi (Candida albicans). Further, the ligand and its Cu(II) complex are also screened for anticancer activity on human breast (MCF7) cancer cell lines by the MTT assay method. Interestingly, Cu(II) complex shows better anticancer activity than the free Schiff base ligand. The in vitro anti-inflammatory and anti-diabetic activities of the ligand and Cu(II) complex are studied. The Cu(II) complex show higher inhibition activity than that of the free ligand

Synthesis, characterization and biological studies on Co(II), Ni(II), Cu(II) and Zn(II) complexes derived from 4-(2-amino ethyl) benzene-1,2-diol and 1,4 benzoquinone

26-36A novel Schiff base ligand (L) has been synthesized using 4-(2-amino ethyl) benzene-1,2-diol (Dopamine) and 1,4 benzoquinone. Co(II), Ni(II), Cu(II) and Zn(II) complexes with this hexadentate ligand have been synthesized with metal:ligand (1:1) stoichiometry. The Schiff base ligand and its metal complexes have been characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared and electronic spectra, ESR, NMR, Mass spectra, powder X-ray diffraction and SEM studies. Molar conductance showed that all complexes are non-electrolytic in nature. The Co(II), Ni(II), Zn(II) complexes are found to be octahedral and distorted octahedral structure for Cu(II) complex. Powder X-ray diffraction reveals that Schiff base ligand and its metal complexes are nano-crystalline in nature but Co(II) complex is amorphous. Different morphologies of synthesized compounds are identified by SEM images. Schiff base ligand and its metal complexes were screened against gram-positive bacteria, gram-negative bacteria and one fungus strain. The data show that the ligand and its metal complexes have significant activity. Copper(II) complex shows better activity than other complexes. The Schiff base ligand and its copper(II) complex are evaluated for the anti-inflammatory by HRBC membrane stabilization method. The anti-cancer activity of Schiff base ligand and its copper complex was also studied against human breast cancer cell line by MTT assay method. The anti-diabetic activity of Schiff base ligand and its copper(II) complex is also studied by alpha-amylase method

Synthesis, spectral characterisation and pharmacological studies on Co(II), Ni(II), Cu(II) and Zn(II) bis-Schiff base complexes derived from 4-hydroxybenzohydrazide

915-926The transition metal(II) chelates have been prepared by the reactions of bis-Schiff base ligands derived from 4-hydroxy benzohydrazide and isophthalaldehyde/ o-phthaldehyde in 1:1 metal to ligand ratio. The formed ligands and their metal complexes have been investigated by elemental analysis, different spectroscopic and thermal analyses techniques. The low molar conductance values give the non-electrolytic nature of the metal(II) chelates. From the spectroscopic observations of complexes, the molecular formula is found to be [M(Ln)2Cl2] (where M= Co(II), Ni(II), Cu(II) and Zn(II), n=1 and 2) and the tetradentate N2O2 donor sites of ligands is attached to the metal centre. The docking results predicts that the protein with ligands have good interaction energy. All formed complexes have efficient antibacterial activity than ligand for tested pathogens. The mode of binding interaction of ct-DNA and Cu(II) complexes gives the intercalative binding with hypochromism shifts using electronic titrations method. In electrophoresis, cleavages of PUC18DNA to cleave effectively with Cu(II) complexes in the presence of hydroxyl radicals. The antioxidant assay of DPPH radical scavenging activity of tested compounds shows good results, when compared to ascorbic acid as standard. The anticancer MTT assay of Cu(II) complexes tested against MCF-7 cancerous cells gives the promising therapeutic activity

Synthesis, characterization and biological studies on Co(II), Ni(II), Cu(II) and Zn(II) complexes derived from 4-(2-amino ethyl) benzene-1,2-diol and 1,4 benzoquinone

A novel Schiff base ligand (L) has been synthesized using 4-(2-amino ethyl) benzene-1,2-diol (Dopamine) and 1,4 benzoquinone. Co(II), Ni(II), Cu(II) and Zn(II) complexes with this hexadentate ligand have been synthesized with metal:ligand (1:1) stoichiometry. The Schiff base ligand and its metal complexes have been characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared and electronic spectra, ESR, NMR, Mass spectra, powder X-ray diffraction and SEM studies. Molar conductance showed that all complexes are non-electrolytic in nature. The Co(II), Ni(II), Zn(II) complexes are found to be octahedral and distorted octahedral structure for Cu(II) complex. Powder X-ray diffraction reveals that Schiff base ligand and its metal complexes are nano-crystalline in nature but Co(II) complex is amorphous. Different morphologies of synthesized compounds are identified by SEM images. Schiff base ligand and its metal complexes were screened against gram-positive bacteria, gram-negative bacteria and one fungus strain. The data show that the ligand and its metal complexes have significant activity. Copper(II) complex shows better activity than other complexes. The Schiff base ligand and its copper(II) complex are evaluated for the anti-inflammatory by HRBC membrane stabilization method. The anti-cancer activity of Schiff base ligand and its copper complex was also studied against human breast cancer cell line by MTT assay method. The anti-diabetic activity of Schiff base ligand and its copper(II) complex is also studied by alpha-amylase method

Effect of Benzotriazole on the microhardness of copper electrodeposits.

The microhardness of copper electrodeposited from an acid sulphate bath with and without the addition agent, Benzotriazole (BTA), has been investigated. From a pure acid bath, the microhardness of deposit varies from 94 VHN to 10 VHN as cd is changed from 6. 5 mA/cm**2 to 39 mA/cm**2. When BTA is added, the microhardness varies from 200 VHN to 379 VHN as cd is changed from 6. 5 mA/cm**2 to 39 mA/cm**2. It is seen that profound increase in microhardness is brought about by the use of BTA as an addition agent. There are many factors which can affect hardness of metals, e. g. internal stress, grain size, banded structure, dispersion of fine particles etc. The role of these in hardness of electrodeposited copper is discussed in detail