11129-89-8

Rubel, M.,Pszonicka, M.,Ebel, M. F.,Jablonski, A.,Palczewska, W.

, p. 7 - 24 (1986)

New metal complexes of N3 tridentate ligand: Synthesis, spectral studies and biological activity

Al-Hamdani, Abbas Ali Salih,Al Zoubi, Wail

, p. 75 - 89 (2014)

New tridentate ligand 3-amino-4-{1,5-dimethyl-3-[2-(5-methyl-1H-indol-3-yl)-ethylimino]-2phenyl-2,3-dihydro-1H-pyrazol-4-ylazo}-phenol L was synthesized from the reaction of 1,5-dimethyl-3-[2-(5-methyl-1H-indol-3-yl)-ethylimino]-2-phenyl-2,3-dihydro-1H-pyrazol-4-ylamine and 3.4-amino phenol. A complexes of these ligand [Ni(II)(L)(H2O)2Cl]Cl, [pt(IV)(L)Cl3]Cl and [M(II)(L)Cl]Cl (M = Pd (II), Zn (II), Cd (II) and Hg (II) were synthesized. The complexes were characterized by spectroscopic methods and magnetic moment measurements, elemental analysis, metal content, Chloride containing and conductance. These studies revealed octahedral geometries for the Ni (II), pt (IV) complexes, square planar for Pd (II) complex and tetrahedral for the Zn (II), Cd(II) and Hg (II) complexes. The study of complexes formation via molar ratio and job method in DMF solution has been investigated and results were consistent to those found in the solid complexes with a ratio of (M:L) as (1:1). The thermodynamic parameters, such as ΔE?, ΔH?, ΔS?ΔG?and K are calculated from the TGA curve using Coats-Redfern method. Hyper Chem-8 program has been used to predict structural geometries of compounds in gas phase. The synthesized ligand and its metal complexes were screened for their biological activity against bacterial species, two Gram positive bacteria (Bacillus subtilis and Staphylococcus aureus) and two Gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa).

The permanent electric dipole moment of PtO, PtS, PtN, and PtC

Steimle, T. C.,Jung, K. Y.,Li, B.-Z.

, p. 1767 - 1772 (1995)

The permanent electric dipole moments of the ground, and the low-lying excited electronic states of platinum monocarbide, PtC, platinum monoxide, PtO, and platinum monosulfide, PtS, were measured using a molecular beam optical Stark spectroscopic scheme.The determined values were (in Debye): PtO(X 3Σ-) 2.77(2); PtO(A 1Σ+) 1.15(4); PtS 1.78(2); PtS 0.54(6); PtC(X 1Σ+) 0.99(5); and PtC(A 1Π) 2.454(3).These results, along with the previous results for PtN(X 2Π1/2) 1.977(9); PtN(d 4Π1/2) 1.05(9) , are used as basis for a discussion of the nature of the electronic states.

Influence of C-H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study

Blagojevi?, Vladimir,Chylewska, Agnieszka,Donnard, Morgan,Filipovi?, Nenad,Gulea, Mihaela,Janji?, Goran,Makowski, Mariusz,Risti?, Predrag,Rodi?, Marko,Todorovi?, Tamara,Vuli?, Predrag

, p. 3018 - 3033 (2020)

Pt(II) and Pd(II) complexes (1 and 2, respectively) with thiomorpholine-4-carbonitrile (TM-CN), an N-substituted thiomorpholine derivative, were synthesized from tetrachlorido precursors in water. Structural analysis has shown that 1 represents the first monomeric metal complex with this ligand type with an axial M-S bond with respect to the TM-CN ring chair conformation, while in 2 a typical equatorial M-S bond position with respect to the ring chair conformation was observed. A detailed DFT investigation revealed that axial conformers are more stable for molecular forms of both metals, while intermolecular interactions in the crystals stabilize the axial conformer for Pt(II) and the equatorial conformer for Pd(II). The magnitude of this stabilization in the case of 2 is large enough to change the most stable axial conformer in the molecular form to the equatorial conformer in the crystal. Further investigation of the strength of individual intermolecular interactions revealed significant differences of some interactions between the two structures. The likely cause of the difference in the crystal structures of experimentally obtained complexes is the fact that 1 and 2 exhibit different dominant interactions: C-H/M and C-H/S are more dominant in 1 and C-H/Cl interactions are more dominant in 2. In addition, DFT calculations have shown that while the axial position of the Pt-S bond with respect to the ring chair conformation results in a significantly shorter C-H/Pt interaction distance than that in the hypothetical equatorial conformer, there is very little difference in C-H/Pd interaction distances in conformers with axial and equatorial positions of Pd-S bond with respect to the ring chair conformation.

The color, photophysical and electrochemical properties of azo-imine ligands and their copper(II) and platinium(II) complexes

Onur, Sultan,Güng?r, Seyit Ali,Tümer, Ferhan,Tümer, Mehmet

, (2020)

Five novel imine based organic ligands (HL1-HL5) and their Cu2+ and Pt2+ metal complexes have obtained and characterized by the micro-analyses, 1H(13C)NMR, Uv–Vis absorption, emission-excit

Quantitative determination of the catalytic activity of bulk metal oxides for formic acid oxidation

Wachs,Fein

, p. 241 - 254 (2002)

The dissociative chemisorption of formic acid to surface formate species on metal oxide catalysts was studied. Comparison of the number of active surface sites for bulk metal oxides yielded similar adsorption surface site densities for the majority of samples studied, ～ 5-6 μmole HCOOads/sq m. Kinetic studies of formic acid oxidation made possible the determination of the apparent activation energies for the various metal oxide catalysts for formic acid oxidation. The turnover frequencies (TOF) values for the various metal oxide catalysts studied varied over 11 orders of magnitude. A strong inverse relationship was observed between the TOF values and the decomposition temperatures of the surface formate intermediates, indicating that the thermal stability of the surface formate intermediate is the only significant kinetic factor. Thus, dissociative adsorption of the formic acid molecule is not kinetically significant for kinetic activity during formic acid oxidation over the metal oxide catalysts. The surfaces of the metal oxide catalysts studied were also oxidized, analogous to in situ Raman observation made with V2O5 and MoO3 during methanol oxidation, since methanol and formic acid both lose two hydrogen atoms during oxidation to H2CO and CO2, respectively.

Synthesis, spectral, thermal and antibacterial studies of schiff base complexes derived from tyrosine and benzaldehyde

Anjum, Rukhsana,Khan, Irfan Ullah,Khan, Bushra,Javed, Muhammad

, (2018/06/06)

In order to develop more potent and novel antibacterial agents, a Schiff base derived from tyrosine and benzaldehyde was prepared along with its Cu(II), Pd(II) and Pt(II) complexes. Formation and purity of the ligand L-1 was determined by1H NMR and elemental analysis along with other analytical techniques like FTIR, UV-Vis spectroscopies, XRD and TGA/DSC analysis. The chemical structures of the prepared Schiff base-metal complexes were suggested depending upon the results obtained from FTIR, UV-Visible spectroscopy, XRD,1H NMR, CHN and TGA/DSC analyses. Analytical data revealed that the Schiff base ligand L-1, can coordinate in the bidentate manner with the metal ions via N and O atoms resulting in the formation of Cu(II), Pd(II) and Pt(II) complexes with 1:2 stoichiometry. Thermal analysis results explained the general decomposition pattern of the prepared compounds and the presence of water molecule in the prepared ligand and its complexes. The crystalline nature of the compounds was confirmed by the powder XRD analysis except for the platinum complex, which was amorphous. The in vitro antibacterial activity of the uncomplexed ligand L-1 and its complexes (Cu(II), Pd(II) and Pt(II)) was also evaluated against gram positive bacterium, Bacillus subtilis and gram negative bacterium, Pseudomonas aeruginosa by the well-diffusion method. Antibacterial activity of the prepared Schiff base ligand L-1 and its complexes was determined in terms of inhibition zones.