Browsing by Author "C.L. Yadava"
Now showing 1 - 17 of 17
- Results Per Page
- Sort Options
PublicationArticle PublicationArticle Electron spin resonance and photoacoustic spectral studies on manganese(II) and copper(II) sulphate and thiocyanate complexes with hexamethylenetetramine(1983) Raghuvir Singh; I.S. Ahuja; C.L. Yadava[No abstract available]PublicationArticle Electron spin resonance studies on some manganese(II) complexes(1983) Raghuvir Singh; I.S. Ahuja; C.L. Yadava[No abstract available]PublicationArticle Hexamethylenetetramine complexes with manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) thiocyanates(1981) I.S. Ahuja; Raghuvir Singh; C.L. YadavaCoordination compounds formed by the interaction of hexamethylenetetramine (Hmta), a potentially tetradentate ligand, with Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) thiocyanates have been prepared and characterized from their elemental analyses, magnetic susceptibilities, electronic and i.r. spectral studies down to 200 cm-1 as well as X-ray powder diffraction patterns in the solid state. The compounds isolated are: Mn(NCS)2(Hmta)2(EtOH)2, Mn(NCS)2(Hmta)2, Co(NCS)2(Hmta)2(EtOH)2, Co(NCS)2(Hmta)2, Ni(NCS)2(Hmta)2(EtOH)2, Ni(NCS)2(Hmta)2, Cu(NCS)2(Hmta)2, Zn(NCS)2(Hmta)2 and Cd(NCS)2(Hmta). It is shown that Hmta, though a potentially tetradentate ligand, acts only as a terminally bonded monodentate ligand or a bidentate ligand bridging between two metal atoms retaining the chair configuration of the uncoordinated molecule in all these complexes. The tentative stereochemistries of the complexes are discussed. The ligand field parameters 10 Dq, B, β, λ and ν2/ν1 calculated for the cobalt, nickel and copper complexes are consistent with their proposed stereochemistries. © 1981.PublicationArticle Infrared spectral evidence for mono-, bi- and tetra-dentate behaviour of hexamethylenetetramine(Springer India, 1983) I.S. Ahuja; Raghuvir Singh; C.L. YadavaInfrared spectral features to distinguish the different modes of hexamethylenetetramine in metal complexes have been presented. The tentative mode of metalhexamethylenetetramme bonding has been arrived at from the pattern of the two p cn bands at 1225 and 1000 cm-1. It is shown that in complexes with terminal monodentate, bidentate and tetradentate the bands show differing behaviour. Except for the splitting of v cn bands the IR spectra are superimposable on that of the uncoordinated molecule supporting the theory that chair configuration of the uncoordinated hexamethylenetetramine is retained in all the complexes. © 1983 Indian Academy of Sciences.PublicationArticle Short communication: Neutral Four-coordinate Tetrahedral Manganese(H) Species Involving Coordinated Chloro- and Thiocyanato-Groups(1982) I.S. Ahuja; Raghuvir Singh; C.L. Yadava[No abstract available]PublicationArticle Some neutral three-coordinate complexes of mercury(II) halides and pseudohalides with N-methylnicotinamide(Springer India, 1989) I.S. Ahuja; C.L. Yadava; Shailendra TripathiCoordination compounds of mercury(II) chloride, bromide, cyanide and thiocyanate with N-methylnicotinamide, a potentially bidentate ligand, have been prepared. The complexesisolated have 1:1 (metal:ligand)stoichiometry. Molecular weight measurements in molten camphor indicate that the mercury (II) chloride and bromide complexes are monomeric. Based on conductance values, molecular weight determinations and infrared spectral data, it is inferred that in the solid state in all these complexes the metal ion has a coordination number three and is bonded to the N-methylnicotinamide via its pyridine ring nitrogen, and is terminally bonded to the halogen/pseudohalogens. © 1981 Indian Academy of Sciences.PublicationArticle Structural information on cobalt(II), nickel(II), copper(II), zinc(II), silver(I) and cadmium(II) nitrate complexes with hexamethylenetetramine from their magnetic moments, electronic and infrared spectra(1980) I.S. Ahuja; Raghubir Singh; C.L. Yadava[No abstract available]PublicationArticle STructural information on manganese(II), cobalt(II), nickeL(II), zinC(II) and cadmium(II) sulphate complexes with hexamethylenetetramine (a potentially tetradentate ligand) from their magnetic moments, electronic and infrared spectra(1982) I.S. Ahuja; C.L. Yadava; Raghuvir SinghCoordination compounds formed by the interaction of hexamethylenetetramine (Hmta), a potentially tetradentate ligand, with manganese(II), cobalt(II), nickel(II), zinc(II) and cadmium(II) sulphates have been prepared and characterized from their elemental analyses, magnetic susceptibilities and electronic and infrared spectral studies down to 200 cm-1 in the solid state. The compounds isolated are: Mn(Hmta)SO4, Co(Hmta)SO4, Ni(Hmta)SO4, Zn(Hmta)SO4, and Cd(Hmta)SO4. It is shown that Hmta, though a potentially tetradentate ligand, acts only as a bidentate ligand bridging between two metal ions retaining the chair configuration of the uncoordinated molecule in all these complexes. Tentative stereochemistries of the complexes in the solid state are discussed. The ligand field parameters 10 Dq,B,β and λ calculated for the manganese(II), cobalt(II) and nickel(II) complexes are consistent with their proposed stereochemistries. © 1982.PublicationArticle STRUCTURAL INFORMATION ON NICKEL(II) AND, ZINC(II) ACETATE COMP1EXES WITH HEXAMETHYLENETETRAMINE(Indian Academy of Sciences, 1981) I.S. Ahuja; Raghuvir Singh; C.L. Yadava1: 2 Coordination compounds formed by the interaction of nickel(II) and zinc(II) acetates with hexamethylenetetramine—a potentially tetradentate ligand—have been prepared and characterized by magnetic susceptibility, electronic and infrared spectral studies in the solid state. It is shown that hexamethylenetetramine, though a potentially tetradentate ligand, acts only as a terminally bonded mono dentate ligand retaining the chair configuration of the uncoordinated molecule in these complexes. Infrared frequencies due to acetate groups indicate that they are present as terminally bonded monodentatc ligands in the zinc(II) complex and bidentate chelating ligands in tht nick·. 1(II) complex. Tentative stereochemistry of the complexes in the solid state is discussed. © (1981), (Indian Academy of Sciences). All Rights Reserved.PublicationArticle Structural information on the coordination compounds formed by manganese(II), cobalt(II), nickel(II), zinc(II), cadmium(II) and mercury(II) thiocyanates with 2-, 3- and 4-benzoylpyridines from their magnetic moments, electronic and infrared spectra(1983) Raghuvir Singh; I.S. Ahuja; C.L. Yadava[No abstract available]PublicationArticle Structural information on the coordination compounds formed by manganese(II), cobalt(II), nickel(II), zinc(II), cadmium(II) and mercury(II) thiocyanates with 4-cyanopyridine N-oxide from their magnetic moments, electronic and infrared spectra(1982) I.S. Ahuja; C.L. Yadava; Raghuvir SinghCoordination compounds formed by the interaction of 4-cyanopyridine. N-oxide (4-CPO), a potentially bidentate ligand, with manganese(II), cobalt(II), nickel(II), zinc(II), cadmium(II) and rnercury(II) thiocyanates have been prepared and characterized from their elemental analyses, magnetic susceptibilities, electronic and infrared spectral studies down to 200 cm-1 in the solid state. The compounds isolated are: Mn(4-CPO)2(NCS)2, Co(4-CPO)2(NCS)2,Ni(4-CPO)2(NCS)2,Zn(4-CPO)2(NCS)2, Cd(4-CPO)(NCS)2 and Hg(4-CPO)2(SCN)2. It is shown that 4-CPO acts as a terminal N-oxide oxygen bonded monodentate ligand in all the metal(II) thiocyanate complexes studied. Tentative stereochemistries of the complexes in the solid state are discussed. The ligand field parameters 10 Dq, B, β and λ calculated for the manganese(II), cobalt(II) and nickel(II) complexes are consistent with their proposed stereochemistries. © 1982.PublicationArticle Synthesis and characterization of neutral, four-coordinate, tetrahedral manganese(II) complexes in volving coordinated chloro and thiocyanato groups in the solid state(1986) I.S. Ahuja; C.L. YadavaPreparations of Mn(2,6-dimethylpyridine-N-Oxide)2Cl2 and Mn(pyrazine)2(NCS)2 have been described. Based on room temperature magnetic moment values, electronic spectral, ligand field parameters and infrared spectral features down to 200 cm−1 the complexes isolated are considered as neutral species of four-coordinated, high spin, monomeric, tetrahedral environments around manganese(II) invovling coordinated chloro and thiocyanato groups in the solid state. © 1986, Taylor & Francis Group, LLC. All rights reserved.PublicationArticle Synthesis and characterization of silver(i) nitrate complexes with 2-, 3- and 4- cyano- pyridines and anilines(1990) I.S. Ahuja; Shailendra Tripathi; C.L. YadavaCoordination compounds formed by the interaction of silver(i) nitrate with 2-, 3- and 4-cyano- pyridines and anilines have been prepared and characterized on the basis of analytical data, molar conductances and infrared spectral measurements down to 200 om -1 in the solid state. The complexes isolated are Ag(2-cyanopyridine)NO3 and AgL2NO3, where L = 3- or 4- cyanopyridine, 2-, 3- or 4-cyano- aniline. Molar conductance measurements indicate that these complexes are non-electrolytes in ethanol but 1:1 electrolytes in aqueous solutions. Infrared spectral studies show that (i) the cyano-pyridines and anilines, though potentially bidentate ligands, act as monodentate ones bonding via the pyridine ring nitrogen (cyanopyridines) or NH2 nitrogen (cyanoanilines) and (ii) the nitrate groups are present as terminally bonded monodentate ligands in all the compounds except in the 2-cyanopyridine complex which is. © 1990, Taylor & Francis Group, LLC. All rights reserved.PublicationArticle Tetradentate behaviour of hexamethylenetetramine(1982) I.S. Ahuja; C.L. Yadava; Raghuvir Singh[No abstract available]PublicationArticle X‐ray diffraction studies on hexamethylenetetramine complexes with cobalt(II) and nickel(II) thiocyanates(1990) I.S. Ahuja; Shailendra Tripathi; C.L. Yadava[No abstract available]PublicationArticle X‐ray diffraction studies on isonicotinonitrile l‐oxide complexes with manganese(II) Chloride, Bromide, and Thiocyanate(1990) I.S. Ahuja; Shailendra Tripathi; C.L. Yadava[No abstract available]