Raghuvir Singh

Complexes of copper(II) with nicotinic acid and some related ligands

SummaryCoordination compounds of copper(II) chloride, bromide, thiocyanate and sulphate with nicotinic acid, nicotinamide and isonicotinamide have been prepared and characterized by molecular conductance, magnetic susceptibility, electronic and i.r. spectral measurements down to 200 cm−1 in the solid state. Possible stereochemistries for these complexes in the solid state are discussed.

2-, 3- and 4-cyanopyridine complexes with some zinc(II), cadmium(II) and mercury(II) salts

Abstract Complexes formed by some zinc(II), cadmium(II) and mercury(II) salts with 2-, 3- and 4-cyanopyridines have been prepared and characterized by molecular conductance and infrared spectral measurements down to 200 cm −1 . Possible structures for these complexes in the solid state are discussed.

2,2′-Bipyridylamine complexes with some zinc(II), cadmium(II) and mercury(II) salts

Abstract The complexes formed by some zinc(II), cadmium(II) and mercury(II) salts with 2,2′-bipyridylamine have been prepared and characterised by molecular conductance and infrared spectral measurements down to 200 cm −1 . Possible structures for these complexes in the solid state are discussed.

SYNTHESIS AND STRUCTURAL STUDIES OF SOME FIRST ROW TRANSITION METAL COMPLEXES OF SALICYLALDEHYDE HYDRAZONE

Durch Mischen einer methanolisch-ethanolischen Losung des Hydrazons mit den entsprechenden Metallsalzen im Verhaltnis 2:1 wurden die Komplexe (I) bzw. (III) dargestellt.

1,3-PROPANEDIAMINE, 1,4-BUTANEDIAMINE (PUTRESCINE) AND 1,5-PENTANEDIAMINE (CADAVERINE) COMPLEXES WITH ZINC(II), CADMIUM(II) AND MERCURY(II) HALIDES AND PSEUDOHALIDES

Abstract Coordination compounds formed by zinc(II), cadmium(II) and mercury(II) halides and pseudohalides with 1,3-propanediamine, 1,4-butanediamine (putrescine) and 1,5-pentanediamine (cadaverine) have been prepared and characterized by molecular conductance and infrared spectral measurements down to 200 cm−1. Possible structures for these complexes in the solid state are discussed.

Hexamethylenetetramine complexes with manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) thiocyanates

Abstract Coordination 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.

Complexes of some bivalent cobalt, nickel, copper, zinc, cadmium and monovalent silver salts with 4,4′-BipyridylN,N′-dioxide

SummaryCoordination compounds have been prepared from 4,4′-hipyridylN,N′-dioxide (4,4′-BipyO2) and some hivalent metal halides, nitrates and thiocyanates as well as silver(1) nitrate.viz., Co(4.4′-BipyO2)2Cl2, Co(4.4′-BipyO2)Br2, Co(4,4′-Bi-pyO2)(NO3)2. Co(4,4′-BipyO2)2(NCS)2. Ni(4.4′-BipyO2)2Cl2. Ni(4,4′-BipyO2)(NO3)2, Ni2(4.4′-BipyO2)3(NSC)4. Cu(4,4′-BipyO2)(NO3)2. Zn(4,4′-BipyO2(NO3)2, Zn,(4.4′-BipyO2)3-(NCS)4. Cd(4.4′-BipyO2)(NO3)2, Cd(4.4′-BipyO2)2(NCS)2 and Ag(4,4′-BipyO2)(NO3). The products were characterized by magnetic susceptibility. electronic and i.r. spectral measurements down to 200 cm−1. Tentative stereochemistries for the complexes isolated in the solid state are proposed. The ligand field parameters 111 Dy. B. j3. )., and calculated for the cobalt. nickel and copper complexes are consistent with these stereochemistries.

Cadmium (II) nitrate complexes with some pyridine N-oxides

Abstract Coordination compounds formed by cadmium (II) nitrate with pyridine N-oxide, 2-methyl-, 3-methyl-, 4-methyl- and 2,6-dimethyl-pyridine N-oxides have been prepared and characterized by molecular weights and i.r. spectral measurements down to 200 cm −1 in the solid state. Possible structures for these complexes in the solid state are discussed.

Bidentate Bridged Morpholine Complexes with Zinc(II) and Cadmium(II) Cyanides

Abstract Coordination compounds formed by zinc(II) and cadmium(II) cyanides with morpholine have been prepared and characterized by infrared spectral measurements down to 200 cm−1 in the solid state. Possible structures for the compounds isolated in the solid state are discussed. Morpholine is shown to act as a terminal N-bonded ligand in the 1:2 zinc(II) cyanide-morpholine complex and a four-coordinated, monomeric pseudotetrahedral structure is suggested for the complex. The 1:1 zinc(II) and cadmium(II) cyanide-morpholine complexes are considered to have four-coordinated polymeric chain structures with bidentate bridged morpholine. The trans or chair configuration of the uncoordinated morpholine is retained in all the complexes.

Magnetic and Spectroscopic Studies on Salicylaldoxime and o-Hydhoxynaphthaldoxime Complexes of Some Divalent 3d Metal Ions

Abstract Some novel complexes of salicylaldoxime (H2Salox) and o-hydroxynaphthaldoxime(H2Nolox) having the compositions M(HNolox)2 [M = VO(IV), Mn(II), Fe(II), Co(II), Ni(II) orCu(II)], M(Nolox)2H2O and M(Salox)·2H2O[M = Mn(II), Co(II), Ni(II), Cu(II), or Zn(II)] have been synthesized and their structures investigated by molar conductance, magnetic susceptibility, electronic and infrared spectral measurements. Molar conductivities of 1:2 complexes of H2Nolox indicate their non-electrolytic behaviour, magnetic and electronic spectral studies suggest square pyramidal geometry for VO(HNolox)2, square planar geometry for the other 1:2 complexes and octahedral geometry for 1:1 Co(II), Ni(II) and Cu(II) complexes. The infrared spectral studies show that H2Nolox acts as mononegative bidentate ligand in 1:2 complexes, the bonding sites being nitrogen and phenolate oxygen and as binegative tetradentate ligands in 1:1 complexes bonding through phenolate and iminoximate oxygen bridging in addition to the bonding sit...