Reactivity of<b> π</b>-cyclopentadienyl cobalt dicarbonyl with free phosphines—Isolation and properties of phosphorus bridged clusters

1097-1100<span style="font-size:11.0pt;mso-bidi-font-family: " times="" new="" roman";color:black;mso-fareast-language:en-us"="">The compounds (π-CpCo)3(CO)2PPh (1), (π-CpCo)3(CO) (PPh)2 (2) and (π-CpCo)3(CO)PCl (3) have been isolated from the reaction of dichlorophenylphosphine, PPhCl2 and trichloro- phosphine, PC13 respectively with π-cyclopentadienylcobaltdi- carbonyl, π-CpCo(CO)2. Decarbonylated products, (π-CpCo)3 (μ-CO)PPh, (4), (π-CpCo)3 (PPh)2 (5) and (π-CpCo)3 (μ-CO)P, (6) are formed on reactions of (1), (2) and (3) respectively with PPh3. The reactions between Fe3 (CO)12 and (2) or (3) stabilises (π-CpCo)2Fe(CO)4 (PPh)2 (7) or (π-CpCo)3Fe (CO)5PCl (8). The characteristics of the products have been ascertained by analytical and spectroscopic measurements. </span

Mixed metal clusters of iron and cobalt from carbonyl iron dichloro-phenylphosphine complexes with cyclopentadienyl cobaltdicarbonyl

2296-2299The reaction of CpCo(CO)2 with the monoiron carbonyl phosphine complexes, Fe(CO)4PPhCl2 and the two diiron carbonyl phosphine complexes, Fe2(CO)6(PPhCl)2, Fe2(CO)6(PPhCl2) have been studied which yields the heterometallic phosphorus bridged cluster molecules (CpCo)2Fe(CO)4 PPh (1) and (CpCo)2Fe(CO)5 PPh (2); (CpCo)2Fe(CO)3 (PPh)2 (4) and (CpCo)2Fe2(CO)5 (PPh)2 (5); CpCoFe2(CO)3(PPh)2  (6) and (CpCo)2Fe2(CO)5 (PPh)2 (7) respectively. A homometallic complex (CpCo)4(PPh)2(3) is also obtained as a side product from the reaction with Fe(CO)4 PPhCl2 only. All the products have been characterised by the analytical data and IR, 1H-NMR and mass spectra

Synthesis and characterisation of a new dinuclear cobalt{II) complex

1034-1036The green complex [Co2(en)2Cl4(H202]2HC1.3H2O obtained by treating cobalt chloride hexahydrate with ethylenediamine when further reacted with suitable mono-, bi-, and tetradentate ligands including schiff bases yielded complexes of the types [Co(en)2(LigA)]CI2 (LigA= dibasic tetradentate ligand anion), [Co(en)2(LigB)]CI2 (LigB = monobasic bidentate ligand anion) and [Co(en)(LigC)]Cl3 (LigC = neutral bidentate ligand). These complexes have been characterised by elemental analyses, JR, electronic, mass spectral, magnetic and thermal data. The complexes' exhibit distorted octahedral geometries around the cobalt atoms

Some mixed ligand complexes of cobalt (II) with bidentate schiff bases

1098-1100Cobalt(II) mixed ligand complexes, [Co(SBb)(SBb׳)] and [Co(SBb)(Lig)] (SBb/SBb' =anions of bidentate schiff bases; Lig = anion of acetylacetone, salicylaldehyde, oxine or glycine ) have been isolated and characterised by elemental analyses, IR, UV - visible and mass spectral data, magnetic moment, ESR and cyclic voltammetric studies. Pseudotetrahedral arrangement of ligands around the cobalt(II) ion is suggested. </span

Carbonyl metal derivatives of schiff bases and schiff base complexes of copper(II), nickel(II) and cobalt(III)

144-148Free schiff bases, copper(II), nickel(II) complexes of schiff bases and mixed ligand complexes of cobalt(III) are subjected to carbonyl chromium insertion reactions. Carbonyl chromium incorporated complexes with tricarbonyl chromium, Cr(CO)3 groups bonded to phenyl rings have been isolated and characterised by FTIR, UV-visible, 1H NMR and FABMS spectroscopic methods. Preferential binding of Cr(CO)3 groups to phenyl rings are discussed

Syntheses, spectroscopic studies, crystal structure and complexation reactions of N- (2 or 4-hydroxylphenyl) benzaldimine

207-213Two monobasic bidentate Schiff base ligands (SBH) derived from the condensation reaction between benzaldehyde and 2-aminophenol (BENOPH) or 4-aminophenol (BENPAPH) have been subjected to complexation reactions stabilising the bis-ligated complexes MII(SB)₂ (MII=Cu, Ni, Co and Zn) where aminophenolic (-OH) groups participate in the complexation reaction. The newly synthesized Schiff bases and their complexes are characterized by elemental analysis, magnetic, spectroscopic and electrochemical studies. Crystal structure studies performed on BENPAPH show it to crystallize in the monoclinic form, space group P2₁/c; Z=4 with a, 6.500(7); b, 14.885(3); c, 10.852(2) Å and β, 91.489(12)º

Synthesis and structural studies on bis-N-(2-hydroxyethyl)-X-salicylaldiminato complexes of cobalt(III) and copper(II)

1010-1014Spectroscopic properties and magnetic behaviours of the synthesised cobalt(III) and copper(II) complexes of the Schiff bases N-(2-hydroxyethyl-X-salicylaldimines) (where X=H or 5Br) and the molecular structure of bis- (N2-hydroxycthylsalicylaldiminato) copper(II) determined by three dimensional single crystal X-ray analysis arc reported.</span

Exchange of amine part of schiff bases with ammonia in presence of a metal ion: Molecular structure of bis-(salicylaldiminato) nickel(II)

373-376The schiff bases N-X1-acetophenyl-X2-salicylaldimines (X1=4 or 3; ·X2=H or 5Br) inert to complexation with nickel(II) and cobalt(II) salts undergo very prompt reactions when ammonia is added to the reaction mixture. X2-salicylaldiminatonickel(II) and cobalt(II) complexes are isolated and identified by elemental analyses, infrared and mass spectra and finally confirmed by X-ray structure analysis performed on a nickel(II) complex.</span

Mixed ligand complexes of cobalt(II and III) — Molecular structure of <i>bis-</i>(4-acetophenylsalicylaldiminato)acetylacetonato cobalt(III)

1050-1054The bidentate Schiff bases, HL'(= N-4-acetophenylsalicylal-dimine), H"(=N-3-acetophenylsalicylaidimine) and HL'"(=N-4-acetophenyl-5-bromosalicylaldimine) do not form complexes with simple cobalt(II)salts, e.g.,Co(CH3COO)2.4H2O and CoCl2.6H2O but undergo facile reactions with Co(acac)2.2H2O (acac=monoanion of acetylacetone). Mixed ligand complexes of both cobalt(III), [Co(L)2(acac)] and cobalt(II), [Co(L)(acac)] (L=L', L", L"') have been isolated and characterised by elemental analyses and magnetic susceptibility measurements, electronic, IR and mass spectral studies and by single crystal X-ray crystallographic structure analysis. The cobalt atom is octahedrally coordinated in which four ligand oxygen atoms define an equatorial plane; the two nitrogen atoms of the L' ligands are in trans-axial positions

Synthesis and reactivity of the copper (II) complexes of N-α-acetophenyl-X-salicylaldimines (α = 4 or 3, X = H, 5-Br or 3-COOH ). Molecular structure of <i>bis-</i>(N-4-acetophenyl-salicylaldiminato) copper(II)

1380-1384The copper (II) complexes of the Schiff bases, N-α-acetophenyl-X-salicylaldimines (α = 4 or 3, X = H, 5-Br or 3-COOH) have been synthesised and characterised by UV-visible, IR, MS, ESR spectroscopy and magnetic susceptibility measurements. The solid state structure of Cu(SACPNx)2 (I) determined by single-crystal X-ray diffraction reveals a distorted square-planar metal coordination involving two imine N- and two deprotonated phenolate O atoms of two bidentate Schiff ligands in trans- arrangement. Both the Schiff bases and their copper (II) complexes undergo facile transamination reactions