Metal complexes of 1,10-phenanthroline derivatives. XIV. Complexes of 1,10-Phenanthrolin-2-yl(pyridin-2-yl)amine

1984 ◽  
Vol 37 (2) ◽  
pp. 281 ◽  
Author(s):  
AS Abushamleh ◽  
HA Goodwin ◽  
CG Benson ◽  
GJ Long
Keyword(s):  
Metal Complexes ◽  
Spectral Data ◽  
High Spin ◽  
Metal Ion ◽  
Chelate Ring ◽  
Chelating Agent ◽  
Membered Chelate Ring

1,10-Phenanthrolin-2-yl(pyridin-2-yl)amine has been prepared in low yield from 2-chloro-1,10- phenanthroline and pyridin-2-amine. The molecule coordinates as a tridentate chelating agent of the ter-imine type and produces low-spin complexes with iron(II) in both its neutral and anionic forms. The bis(ligand) cobalt(II) complex is high-spin. Although the ligand provides a slightly weaker field than terpyridine, electronic and Mossbauer spectral data indicate a less distorted metal ion environment in its complexes, compared with those of terpyridine. This is correlated with the presence of the six-membered chelate ring.

Metal complexes of 1,10-Phenanthroline derivatives. IV. Complexes of 1,10-Phenanthroline-2-carboxamide

1972 ◽  
Vol 25 (1) ◽  
pp. 37 ◽  
Author(s):  
HA Goodwin ◽  
FE Smith
Keyword(s):  
Oxygen Atom ◽  
Metal Complexes ◽  
High Spin ◽  
Chelating Agent ◽  
Weak Field ◽  
Amide Group ◽  
Magnetic Data ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Bivalent Iron

Complexes of the tridentate chelating agent 1,l0-phenanthroline-2- carboxamide, with bivalent iron, cobalt, nickel, and copper are described. Bis-ligand, six-coordinate complexes were obtained with all metals. A series of mono-ligand complexes, which are also believed to be six-coordinate, was also obtained. Infrared evidence indicates that the amide group is bound through the oxygen atom. Electronic spectral and magnetic data indicate that the ligand produces a relatively weak field and the iron complexes are high-spin. The tris-ligand iron(11) complex of pyridine-2-carboxamide is also described. This too is high-spin, although the bidentate amide apparently produces a slightly stronger field than the tridentate.

Structural Studies of Complexes of Tridentate Terimine Systems. Crystal Structure of Bis(2,2′:6′,2′′-terpyridine)ruthenium(II) Perchlorate Hydrate, Bis(2,2′:6′,2′′-terpyridine)- osmium(II) Perchlorate Hemihydrate and Bis((1,10-phenanthrolin-2-yl)(pyridin-2-yl)amine)iron(II) Tetrafluoroborate Dihydrate

1998 ◽  
Vol 51 (12) ◽  
pp. 1131 ◽  
Author(s):  
Donald C. Craig ◽  
Marcia L. Scudder ◽  
Wendy-Anne McHale ◽  
Harold A. Goodwin
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Metal Ion ◽  
Chelate Ring ◽  
Monoclinic Space Group ◽  
Structural Studies ◽  
Triclinic Space Group ◽  
Space Group ◽  
Membered Chelate Ring ◽  
Group I

The crystal structures of bis(2,2′:6′,2″-terpyridine)ruthenium(II) perchlorate hydrate, bis(2,2′:6′,2″- terpyridine)osmium(II) perchlorate hemihydrate and bis((1,10-phenanthrolin-2-yl)(pyridin-2-yl)- amine)iron(II) tetrafluoroborate dihydrate are described. In the terpyridine complexes the ruthenium-nitrogen distances and the corresponding osmium-nitrogen distances are not significantly different. In both complexes the ligand geometry and the metal ion environment show the distortions usual for bis(terpyridine) systems. Distortions are less marked in the bis((1,10-phenanthrolin-2-yl)(pyridin-2-yl)amine)iron(II) cation in which each tridentate unit forms one five-membered and one six-membered chelate ring. [Ru(trpy)2] [ClO4]2.(H2O)1.1: tetragonal, space group I 41/a, a, b 12·527(2), c 40·202(11) Å, Z 8. [Os(trpy)2] [ClO4]2.(H2O)0·5: monoclinic, space group P 21/n, a 8·842(3), b 8·861(1), c 39·22(2) Å, β93·89(2)°, Z 4. [Fe(phpyam)2] [BF4]2.(H2O)2: triclinic, space group P -1, a 12·43(1), b 12·45(1), c 13·35(1) Å, α 62·70(10), β 78·55(8), γ 72·46(9)°, Z 2.

scholarly journals Study of Coordination Characteristics of some Metal Complexes of 2-Thiouracil by Infrared Spectroscopy

2015 ◽  
Vol 49 ◽  
pp. 74-80 ◽  
Author(s):  
P. Jacquline Rosy ◽  
S. Kalyanasundharam ◽  
K. Santhanalakshmi ◽  
S. Muthukumar ◽  
P. Manivannan
Keyword(s):  
Infrared Spectroscopy ◽  
Metal Complexes ◽  
Spectral Data ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Vibrational Frequencies ◽  
Vibrational Assignments ◽  
Fundamental Frequencies ◽  
Ion Interactions ◽  
Metal Ion Interactions

The infrared spectra of 2-Thiouracil (Thu) have been recorded in the region 4000-400 cm-1. The assignments of fundamental frequencies have been proposed on the basis of assignments in related molecules. Correlation of vibrational assignments with those of related molecules have been pointed out. The metal ion interactions of Thu with Cd (II), Hg (II), Cu (II), and Zn (II) bromides have been investigated by infrared spectroscopy. The results are consistent with the bonding of ligands through sulphur in all the complexes. The vibrational frequencies of metal complexes of 2-Thiouracil are correlated with the spectral data of other structurally related pyrimidine thione complexes.

scholarly journals Schiff bases of 1,5-diarylpent-4-ene-1,3-diones and their metal complexes: Synthesis, characterization and fluorescent studies

2020 ◽  
pp. 62-62
Author(s):  
Muhammed Ummathur ◽  
Radhika Pallikkavil ◽  
Krishnannair Krishnankutty
Keyword(s):  
Hydrogen Bonding ◽  
Schiff Base ◽  
Metal Complexes ◽  
Spectral Data ◽  
Schiff Bases ◽  
1H Nmr ◽  
Fluorescence Intensity ◽  
Metal Ion ◽  
Fluorescence Emission ◽  
Fluorescent Studies

Four Schiff bases (H2L1 to H2L4) have been synthesized by the con-densation between o-aminophenol and unsaturated diketones (1,5-diarylpent-4--ene-1,3-diones). Analytical, IR, 1H NMR and mass spectsral data revealed their existence in the imine-enamine form. Dibasic tetradentate coordination of the Schiff bases in their ML complexes [M = Cu(II), Ni(II), Co(II), Zn(II), Cd(II), and Hg(II)] has been established on the basis of physical, analytical and spectral data. The fluorescent studies of H2L4 show that fluorescence emission maxima shift with increase in polarity and hydrogen bonding ability of the solvent. Paramagnetic Cu(II), Ni(II) and Co(II) ions decrease the fluorescence intensity with increase in concentration of the metal ion while diamagnetic Zn(II), Cd(II) and Hg(II) ions have very little influence on the intensity of fluorescence of the Schiff base H2L4.

Metal complexes of quadridentate Schiff bases which can form a four-membered chelate ring

1997 ◽  
Vol 266 (1) ◽  
pp. 1-3 ◽  
Author(s):  
Alessandro Pasini ◽  
Rosa Pia Ferrari ◽  
Sarah Lanfranconi ◽  
Andrea Pozzi ◽  
Enzo Laurenti ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Schiff Bases ◽  
Chelate Ring ◽  
Membered Chelate Ring

scholarly journals Designing, synthesis and spectral characterization of Schiff base transition metal complexes: DNA cleavage and antimicrobial activity studies

2008 ◽  
Vol 73 (11) ◽  
pp. 1063-1071 ◽  
Author(s):  
N. Raman ◽  
Syed Ali ◽  
Dhaveethu Raja
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Spectral Data ◽  
Transition Metal Complexes ◽  
Metal Ion ◽  
Spectral Studies ◽  
Central Metal ◽  
Elemental Analyses

A new series of transition metal complexes of Cu(II), Ni(II), Co(II) and Zn(II) have been designed and synthesized using a Schiff base (L) derived from 4-aminoantipyrine, benzaldehyde and o-phenylenediamine. The structural features were derived from their elemental analyses, magnetic susceptibility and molar conductivity, as well as from mass, IR, UV-Vis, 1H-NMR and ESR spectral studies. The FAB mass spectral data and elemental analyses showed that the complexes had a composition of the ML type. The UV-Vis and ESR spectral data of the complexes suggested a square-planar geometry around the central metal ion. The magnetic susceptibility values of the complexes indicated that they were monomeric in nature. Antimicrobial screening tests were also performed against four bacteria, viz. Salmonella typhi, Staphylococcus aureus, Escherichia coli, and Bacillus subtilis and three fungi, viz. Aspergillus niger, Aspergillus flavus and Rhizoctonia bataicola. These data gave good results in the presence of metal ion in the ligand system. The nuclease activity of the above metal complexes shows that only the copper complex cleaves CT DNA in the presence of an oxidant.

Sulphur-nitrogen chelating agents. III. Metal complexes of 2-methylthiomethylpyridine

1967 ◽  
Vol 20 (2) ◽  
pp. 239 ◽  
Author(s):  
PSK Chia ◽  
SE Livingstone ◽  
TN Lockyer
Keyword(s):  
Absorption Spectrum ◽  
Solid State ◽  
Metal Complexes ◽  
Spectral Data ◽  
High Spin ◽  
Chelating Agents ◽  
Chloride Ion ◽  
Visible Absorption Spectrum ◽  
Visible Absorption ◽  
Pyridine Nitrogen

Complexes of 2-methylthiomethylpyridine (mmp) have been obtained with cobalt(II), nickel(II), copper(II), copper(I), palladium(II), platinum(II), silver(I), and mercury(II). The compounds MX2 mmp2 (M = Co, Ni; X = Cl, Br, SCN) and NiI2 mmp2 are high-spin and their reflectance spectra indicate that the complexes are octahedral in the solid state. The visible absorption spectrum of CoCl2 mmp2 in nitrobenzene indicates that the complex is tetrahedral in solution with the ligand probably coordinated through the pyridine nitrogen only. The tris-chelated complexes [M mmp3](ClO4)2 were also characterized. Spectral data indicate that the complexes CuX2 mmp (X = Cl, Br) possess a tetragonal polymeric structure in the solid state. Conductimetric titration of the perchlorate [Cu mmp2](ClO4)2 with chloride ion in nitromethane demonstrated the formation of [CuCl mmp2]+ in solution. This was confirmed by the isolation of [CuCl mmp2]ClO4 and [CuBr mmp2]ClO4. The bis-chelated complex CuCl2 mmp2 gives a solution in nitrobenzene which is virtually non-conducting. The complexes PdX2 mmp (X = Cl, Br, I, SCN), Pt(SCN)2 mmp, [M mmp2]- (ClO4)2 (M = Pd, Pt, Hg), [Pt mmp2][PtCl4], and [Cu mmp2]ClO4 were also isolated. The silver(I) complex Ag mmp ClO4 probably contains the dimeric cation [Ag2 mmp2]2+.

scholarly journals Study of Metal Complexes with Schiff Base Derived from 2-Amino-4, 6-dimethylbenzothiazole and Pyrrole-2- aldehyde

2021 ◽  
Vol 9 (VIII) ◽  
pp. 931-936
Author(s):  
Dr. Vilas G. Deshpande
Keyword(s):  
Metal Complexes ◽  
Spectral Data ◽  
Schiff Bases ◽  
Metal Ion ◽  
Thermal Studies ◽  
Analytical Data ◽  
Conductivity Measurement ◽  
Planar Geometry ◽  
Central Metal

As it is proved that the transition metal complexes have drug activities, hence we have synthesized heterocyclic Schiff bases. Six complexes of Co(II), Ni(II), Fe(III), Mn(II), Cr(II) and Cu(II) Schiff bases have been prepared. All ligands and its metal complexes the structures of the complexes have been proposed by analytical data, conductivity measurement, magnetic moment, IR, 1H NMR spectra and thermal studies. Analytical data confirmed 1:2 (metal:ligand) stoichiometry and the spectral data suggest that all Fe(III), Mn(II), Cr(II), Ni(II) and Co(II) complexes have octahedral geometry where as the Cu(II) metal complex shows the square planar geometry. The molar conductance values of metal complexes suggest their non electrolytic nature. The IR spectral data reveals that the ligand behaves as bidentate with O,N donor atoms sequence towards central metal ion. Antibacterial and antifungal activities of ligands and its metal complexes were performed in vitro against E.coli, S. typhi, S. aureus, B. subtilis and against various fungi like P.chrysogenum, A. niger, F. moniliformae, and A.Flavus. The complexes show more activity compare to the ligand.

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