scholarly journals Synthesis and characterization of divalent metal complexes with ligand derived from the reaction of 3-aminopyridine and biacetyl

2006 ◽  
Vol 71 (8-9) ◽  
pp. 939-944 ◽  
Author(s):  
D.P. Singh ◽  
Ramesh Kumar ◽  
Rimpi Mehani ◽  
S.K. Verma
Keyword(s):  
Far Infrared ◽  
Azomethine Nitrogen ◽  
Spectral Studies ◽  
Copper Salts ◽  
Cobalt Nickel ◽  
Pyridine Nitrogen ◽  
Distorted Octahedral ◽  
Infrared Spectral ◽  
Divalent Cobalt

Divalent cobalt, nickel and copper salts reacted in situ with 3-aminopyridine and biacetyl to form complexes of the type: [M(Ap2biac) 2X2], where Ap 2biac is the ligand and X=Cl, Br, NO3 or NCS. The complexes were analyzed and characterized as distorted octahedral by conductance, molecular weight magnetic, electronic and IR spectral studies. The electronic spectra were interpreted and tentative assignments made. The infrared spectral studies revealed that two molecules of 3-aminopyridine were joined by molecules of biacetyl through a two carbon atom bridge and that the ligand coordinated through azomethine nitrogen atoms, whereas the pyridine nitrogen does not participate in the coordination. In the far infrared spectra, various metal-ligand vibrations were observed and are discussed.

scholarly journals Synthesis, characterization and antibacterial and antifungal studies of some tetraazamacrocyclic complexes

2010 ◽  
Vol 75 (10) ◽  
pp. 1369-1380 ◽  
Author(s):  
Dharam Singh ◽  
Vandna Malik ◽  
Ramesh Kumar ◽  
Krishan Kumar ◽  
Saurabh Dhiman
Keyword(s):  
Spectral Studies ◽  
Antibacterial And Antifungal Activities ◽  
Cobalt Nickel ◽  
Nickel Copper ◽  
Elemental Analyses ◽  
Infrared Spectral ◽  
Copper Zinc ◽  
Divalent Cobalt ◽  
Antibacterial And Antifungal

A new series of complexes was synthesized by template condensation of malonyl dihydrazide and glyoxal in methanolic medium in the presence of divalent cobalt, nickel, copper, zinc and cadmium salts, whereby complexes of the type: [M(C5H6N4O2)X2] where M = Co(II), Ni(II), Cu(II), Zn(II) and Cd(II), and X = Cl-, NO3- and OAc-, were formed. The complexes were characterized with the aid of elemental analyses, conductance measurements, magnetic susceptibility measurements, and electronic, NMR and infrared spectral studies. Based on these studies, a six coordinate octahedral geometry is proposed for these complexes. The complexes were tested for their in vitro antibacterial and antifungal activities. The minimum inhibitory concentration shown by complexes was compared with that of standard drugs.

scholarly journals Synthesis, Spectroscopic and Physicochemical Characterization and Biological Activity of Co(II) and Ni(II) Coordination Compounds with 4-Aminoantipyrine Thiosemicarbazone

2005 ◽  
Vol 3 (3-4) ◽  
pp. 271-288 ◽  
Author(s):  
Ram K. Agarwal ◽  
Surendra Prasad
Keyword(s):  
Coordination Compounds ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Physicochemical Characterization ◽  
Spectral Studies ◽  
Distorted Octahedral ◽  
Infrared Spectral ◽  
Thermogravimetric Studies ◽  
Antibacterial And Antifungal

We describe the synthesis and characterization of cobalt(II) and nickel(II) coordination compounds of 4[N-(furan-2’-aldimine)amino]antipyrine thiosemicarbazone (FFAAPTS) and 4[N-(4'-nitrobenzalidene) amino]antipyrine thiosemicarbazone (4'-NO2BAAPTS). All the isolated compounds have the general composition MX2(L)(H2O) (M = Co2+or Ni2+; X = Cl, Br, NO3, NCS or CH3COO; L = FFAAPTS or 4'-NO2BAAPTS) and M(ClO4)2(L)2(M = Co2+or Ni2+; L = FFAAPTS or 4'-NO2BAAPTS). Infrared spectral studies indicate that both the thiosemicarbazones coordinate in their neutral form and they act as {N,N,S} tridentate chelating ligands. Room temperature magnetic measurements and electronic spectral studies suggest the distorted octahedral geometries of the prepared complexes. Thermogravimetric studies are also reported and the possible structures of the complexes are proposed. Antibacterial and antifungal properties of these metal-coordination compounds have also been studied.

scholarly journals Transition metal M(II) complexes with isonicotinoylhydrazone-9-anthraldehyde

2010 ◽  
Vol 75 (11) ◽  
pp. 1515-1531 ◽  
Author(s):  
M.L. Dianu ◽  
A. Kriza ◽  
N. Stanica ◽  
A.M. Musuc
Keyword(s):  
Thermal Analyses ◽  
Thermal Studies ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Conductivity Measurements ◽  
Tetrahedral Geometry ◽  
Physico Chemical ◽  
Pyridine Nitrogen ◽  
Infrared Spectral ◽  
Nitrate Complexes

New complexes of isonicotinoylhydrazone-9-anthraldehyde with Cu(II), Co(II) and Ni(II) have been prepared and characterized by analytical and physico-chemical techniques, such as elemental and thermal analyses, magnetic susceptibility and conductivity measurements, and electronic, EPR and IR spectral studies. The infrared spectral studies revealed the bidentate or monodentate nature of the Schiff base in the complexes; the pyridine nitrogen does not participate in the coordination. A tetrahedral geometry is suggested for the nitrate-complexes and an octahedral geometry for the others. Thermal studies support the chemical formulation of these complexes.

2-Aminothiazole, acetylaminothiazole, dimethylhydantoin and thiohydantoin complexes of tin(IV) and titanium(IV) halides

1974 ◽  
Vol 27 (8) ◽  
pp. 1827 ◽  
Author(s):  
PP Singh ◽  
UP Shukla
Keyword(s):  
Infrared Spectra ◽  
Donor Site ◽  
Far Infrared ◽  
Carbonyl Oxygen ◽  
Spectral Studies ◽  
Infrared Spectral ◽  
Far Infrared Spectra

Complexes of the type MX4L2 (M = Sn, Ti; X = Cl, Br, I; L = dimethylhydantoin, thiohydantoin, 2-aminothiazole and 2-acetylaminothiazole) have been prepared and characterized. Infrared spectral studies indicate exocyclic nitrogen of 2:aminothiazole and carbonyl oxygen of all other ligands as the donor site. Far-infrared spectra suggest that dimethylhydantoin and 2-acetylaminothiazole complexes are trans, and 2-aminothiazole and thiohydantoin complexes are cis octahedral.

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