ESR spectral study of the reaction of potassium bromide with dichlorobis- (diphenylphosphinothioyl)ethanecopper(II) complex in the solid state

536-537The reaction of potassium bromide with dichlorobis (diphenylphosphinothioyl)ethanecopper(II) has been studied in the solid state. The samples of the mixtures (2:1) of the two reactants are heated to 100, 150, and 180°C (±2°C)and their X-band ESR spectra are recorded after cooling the samples to room temperature (28±1°C). The studies reveal the formation of a copper(II) bromide complex, CuBr2L [L = bis(diphenylphosphinothioyl) ethane]

Metal-heterocyclic thione interactions-14. Synthesis and spectroscopic of ruthenium(II) complexes containing pyridine-2-thione and bis(tertiaryphosphines/phosphine sulphides)

534-536A series of ruthenium(II) complexes containing pyridine-2-thione (C5H5NS) and bis(tertiary phosphine/ phosphine chalcogenide) are described. The complexes of stoichiometry, Ru (C5H4NS)2 (L-L) {where L-L = Ph2P-CH=CH-PPh2 (dppen-PP)(1) Ph2P-CH2-P(S)Ph2 (dppm-PS) (2), Ph2P-CH2- CH2 -P(S)Ph2 (dppe-PS) (3) and Ph2P(S)-CH2-CH2 P(S)Ph2 (dppe-SS (dppe-SS) (4)) are formed by the replacement of PPh3 from Ru (C5H4NS)2 (PPh3)2 using a bis(tertiary phosphine) ligand in the presence of Et3N base in dry toluene under dry nitrogen. All these compounds have been characterised by analytical data, IR and NMR (1H and 13C) spectroscopy. Octahedral structures are suggested for the complexes in which diphosphines and pyridine- 2- thiolate are chelating

Metal-heterocyclic thione interactions. 11. Preparation and NMR spectroscopy of bis(pyridine-2-thiolato- or 1-oxopyridine-2- thione) palladium(II)/platinum(II) and their triphenylphosphine complexes

592-595Reactions of palladium(II)/platinum(II) chlorides with sodium salts of pyridine-2-thione (Na+C5H4NS-) or l-hydroxypyridine-2- thione(Na+C5H4NOS-) yield products of composition, Pd(C5H4NS)2 (1), Pd(C5H4NOS)2 (<b style="mso-bidi-font-weight: normal">2) and Pt(C5H4NOS)2 (3). Reactions of <b style="mso-bidi-font-weight: normal">1-3 with triphenyl- phosphine gave Pd(C5H4NS)2 (PPh3)2<span style="font-size:14.0pt; font-family:" arial","sans-serif";mso-fareast-font-family:"times="" new="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US"> (4), Pd(C5H4NOS)2 (PPh3) (5) and Pt(C5H4NOS)2 (PPh3)2 (6). All the complexes have been characterised by analytical data, IR, far IR and multinuclear (1H, 13C, 31<span style="font-size:14.0pt; font-family:" times="" new="" roman","serif";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US">P) NMR spectroscopy. <span style="font-size:14.0pt;font-family: " arial","sans-serif";mso-fareast-font-family:"times="" new="" roman";mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US">It is observed that whereas <b style="mso-bidi-font-weight: normal">1 and 2 show one type of isomer, 3 exhibits cis-trans isomerism in the ratio of 1:2.</span

Organophosphorus reagents as extractants: Part 2-Synergic effect of triphenylphosphine oxide on the extraction of Co(II)/Zn(II) from binary mixtures with Cr(III), Ag(I), Hg(II), Mg(II) or Al(III) using 8-hydroxyquinoline

933-935Suitable combinations of 8-hydroxyquinoline (HQ) and triphenylphosphine oxide(Ph3PO) show synergism of 10-12% in the extraction of Co(II) and Zn(II) compared to the use of HQ alone. At the synergic points, Co(II)/Zn(II) are separated from their binary mixtures with Cr(III), Ag(I), Hg(II), Mg(II) or Al(III). The recovery is 95-97% and the nature of the species is CoQ2(Ph3PO) and ZnQ2(Ph3PO)2 respectively for Co(II) and Zn(II). The effects of pH of solutions, dilution of the phases and various anions are studied

Organophosphorus reagents as extractants-Part 4: Synergic effect of bi(diphenylphosphinyl)ethne on the extraction of iron(ll), cobalt(ll), nickel(ll), copper(ll) and zinc(ll) using 8-hydroxyquinoline

273-276A series of 3d-metals {Fe,Co, Ni, Cu and Zn) have been quantitatively separated from binary mixtures using suitable synergic combinations of bis(diphenylphosphinyl) ethane, with 8-hydroxyquinoline. There is synergic effect of 10-18% in the extraction of metals versus the use of 8-hydroxyquinoline alone. The formation of the extracted species is established using the slope analysis method. The extraction constants for the synergic species as well as stability constants are determined from the metal distribution data using linear regression analysis

Synthesis and multinuclear NMR studies of some 2-(2’-pyridyl)phenyl substituted organotellurium(IV)/mercury(II) compounds

460-462The synthesis and spectral properties of 2-(2'-pyridyl)-phenyltellurium(IV) trichloride and 2-(2'-pyridyl)-phenyl mercury(II) iodide as well as reactions of 2-(2'-pyridyl)phenyltellurium(lV) halides (RTeX3, X = Cl, Br) with methyl iodide or 2-(2'-pyridyl)-phenylmercury(II) chloride are described. The attempt to metallate TeBr4 with 2-phenylpyridine ended with the formation of an adduct. The compounds are studied using analytical data, IR and multinuclear NMR (1H, 13C, 125Te and 199Hg) data

Chemistry of mercaptopyridines and related ligands: Part II-ESR and other studies of the new mixed-ligand complexes of iron (III) with 2(1H)-pyridinethione-S and tertiary phosphine ligands

877-880The reaction of 2(1H)-pyridinethione-S(HpyS) with iron (III) chloride/bromide gives complexes of the type, FeX3(HpyS)1.5, which on subsequent reactions with a series of phosphorus ligands such as Ph3P, Ph3PO, Ph2P(CH2)mPPh2 and Ph2P(O)(CH2)mP(O)Ph2 (m= 1, 2) in ethanol-chloroform mixture give the mixed ligand complexes, FeX3(HpyS)Ln [X = CI, Br; n = 2 for L = Ph3P, Ph3P O and n = 1 for bidentate ligands]. All these compounds have been characterized on the basis of analytical data, conductivity measurements, IR, far IR, UV-VIS and X-band ESR spectral data. Possible structures are suggested

Chemistry of mercaptopyridines and related ligands: Part I-Synthesis & spectroscopic studies of complexes of copper(I) with 2(1H)-pyridinethione-S and tertiaryphosphines

1225-1227Reaction of 2(1H)-pyridinethione-S(HpyS) with copper(II) chloride gives a copper(I); complex of stoichiometry, CuCl(HpyS) which on further reaction with triphenylphosphine (Ph3P ) and bis(diphenylphosphino) alkanes, Ph2P(CH2)nPPh2 (n = 1-4) gives mixed ligand complexes, CuCl(HpyS)Ln (n = 2 for Ph3P and 1 for other ligands). On the other hand, the reaction of copper(II) bromide with HpyS gives a copper(II) complex, CuBr2(HpyS)2 which on similar reactions with phosphine ligands gives the analogous copper(I) complexes, CuBr(HpyS)Ln. The X-ray crystal structure for CuCl(HpyS)(Ph3P)2 supports the formulated geometries for other complexes

Organophosphorous reagents as extractants: Part 5 Synergic effect of triphenylphosphine oxide on the extraction of iron (III) using 4- phenyl-2, 4- butanedione

178-179Fe (III) separated quantitatively from its binary mixtures with Cr(III), Mn(II), Co(II), Ni(II), Zn(II), Hg (III), Mg(II) and from steel samples using a synergic combination of 4-phenyl-2,4-butanedione(HA) with triphenylphosphine oxide(Ph3PO). However, copper (II) and silve (I) interfere. The extraction and stability constants of the synergic species Fe(NCS)A2Ph3Po) are found to be:1.2 109 and 7.3 104 respectively