Metal chelates in adsorption polarography I: Mo(VI) and derivatives of oxine

1987 ◽  
Vol 92 (1-3) ◽  
pp. 121-131 ◽  
Author(s):  
Balazs Magyar ◽  
Peter Richner
Keyword(s):  
Metal Chelates ◽  
Derivatives Of

Thio derivatives of β-diketones and their metal chelates. XIX. Metal chelates of two new fluorinated Monothio-β-diketones and their mass spectra

1975 ◽  
Vol 28 (6) ◽  
pp. 1249 ◽  
Author(s):  
SE Livingstone ◽  
N Saha
Keyword(s):  
Mass Spectra ◽  
Metal Chelates ◽  
The Novel ◽  
Copper Chelates ◽  
Derivatives Of

The nickel(II), palladium(II), platinum(II), copper(II), zinc(II) and rhodium(III) chelates of the new fluorinated monothio-β-diketones RC(SH)=CHCOCF3 (R = Pri, Bui) and the iron(III), ruthenium(III) and cobalt(III) chelates of PriC(SH)=CHCOCF3 have been prepared. The mass spectra of all but the two copper chelates have been obtained. The novel features of the spectra are the occurrence of the ions M-(R-H), M-R, and M-LH and the loss of H2S from the ions M-LH and M-L.

Thio derivatives of β-diketones and their metal chelates. XXIII. Adducts of nickel(II) chelates of fluorinated Monothio-β-diketones with nitrogen heterocycles

1976 ◽  
Vol 29 (6) ◽  
pp. 1209 ◽  
Author(s):  
SE Livingstone ◽  
JH Mayfield ◽  
DS Moore
Keyword(s):  
Carbonyl Group ◽  
Infrared Spectra ◽  
Nitrogen Heterocycles ◽  
Metal Chelates ◽  
Derivatives Of

Paramagnetic adducts of the nickel(11) chelates of the fluorinated monothio-β-diketones RC(SH)=CHCOCF3 (R = β-naphthyl, p-ClC6H4, m-ClC6H4, m-BrC6H4, m-MeC6H4, 3,4-Cl2C6H3) have been obtained with pyridine, y-picoline, 2,2'-bipyridyl, and 1,l0-phenanthroline. They are of the type NiL2(base)2 (L = RCS=CHCOCF3; base = py, γpic, �bpy, �phen). With 2,2',2"-terpyridyl two types of adduct were isolated: (a) mononuclear NiL2(trpy) and (b) trinuclear Ni3L6(trpy)2. The infrared spectra of all the adducts display v(C-O) in the range 1552-1580 cm-l; this band is characteristic of a bidentate monothio-β-diketonato ligand. The spectra of the mononuclear terpyridyl adducts display in addition a v(C=O) band at c. 1650 cm-1, indicating that one carbonyl group is not coordinated.

Thio derivatives of β-Diketones and their metal chelates. III. Metal chelates of some fluorinated Monothio-β-diketones

1966 ◽  
Vol 19 (7) ◽  
pp. 1179 ◽  
Author(s):  
RKY Ho ◽  
SE Livingstone ◽  
TN Lockyer
Keyword(s):  
Organic Solvents ◽  
Metal Chelates ◽  
Complexing Ability ◽  
Derivatives Of

Metal chelates of 1,1,1-trifluoro-4-mercapto-4-(2-thienyl)but-3-en-2 one, C4H3SC(SH)=CHCOCF3 (TTMBH), and 1,1,1-trifluoro-4-mercaptopent-3-en-2-one, MeC(SH)=CHCOCF3 (TMPH) have been prepared. Inner complexes of both TTMBH and TMPH were obtained with cobalt(III), nicke1(II), palladium(11), platinum(II), zinc(II), cadmium(11), mercury(11), and lead(II); they are readily soluble in organic solvents. TTMBH gives the spin-free complex Fe(TTMB)3, the copper(II) complex Cu(TTMB)2, and the μ-dioxo-bridgedvanadium(1V) compound V2O2(TTMB)4. Iron(III) and copper(II) oxidize TMPH to the disulphide (TMP)2; however, a polymeric copper(I) complex Cu(TMP) was isolated. The complexing ability of TMPH appears to be weaker than that of TTNBH.

scholarly journals Thio derivatives of β-diketones and their metal chelates. XX. Magnetic moments of some ruthenium(III) chelates of fluorinated Monothio-β-diketones

1975 ◽  
Vol 28 (11) ◽  
pp. 2531 ◽  
Author(s):  
SE Livingstone ◽  
JH Mayfield ◽  
DS Moore
Keyword(s):  
Room Temperature ◽  
Magnetic Moments ◽  
Metal Chelates ◽  
Magnetic Data ◽  
Derivatives Of

Magnetic data have been obtained for ruthenium(III) chelates of the fluorinated monothio-β-diketones RC(SH)=CHCOCF3 (R = 2-thienyl, β- naphthyl, Ph,p-MeC6H4, m-MeC6H4, m-ClC6H4, m-BrC6H4).The compounds are low-spin (S = 1/2) with moments in the range 1.68-1.84 B.M. at room temperature; the moments decrease with decrease in temperature.

Thio derivatives of β-diketones and their metal chelates. XI. Stability constants of nicke(II), copper(II). zinc(II), cadniium(II), and lead(II) chelates of two monothio-β-diketones

1969 ◽  
Vol 22 (7) ◽  
pp. 1363 ◽  
Author(s):  
SE Livingstone ◽  
EA Sullivan
Keyword(s):  
Stability Constants ◽  
Water Solution ◽  
Supporting Electrolyte ◽  
Nickel Complexes ◽  
Metal Chelates ◽  
Acid Dissociation ◽  
Acid Dissociation Constant ◽  
Chloro Complexes ◽  
Lead And Cadmium ◽  
Derivatives Of

The acid dissociation constant (pKD) of the monothio derivative of benzoyl-acetone, viz. 3-mercapto-1-phenylbut-2-en-1-one (I), was found to be 10.43 in 74.5 vol. % dioxan-water solution. Stoicheiometric stability constants (log kn) of five metal chelates of (I) and of the monothio derivative of dibenzoylmethane, viz. 3-mercapto-1,3- diphenylprop-2-en-1-one (II), have been measured in 74.5 vol. % dioxan- water solution with both chloride and perchlorate as supporting electrolyte. ��� With chloride as supporting electrolyte the values obtained for log kav are as follows: with ligand (I), copper(II) 10.11, nickel(II) 9.25, zinc(II) 6.68, lead(II) 6.06, cadmium(II) 6.12; with ligand (II), copper(II) 10.66, nickel(II) 10.20, zinc(II) 7.44, lead(II) 7.11, cadmium(II) 6.90. With perchlorate as supporting electrolyte zinc, lead, and cadmium give values of log kav which are 1.5-1.9 units greater. The thermodynamic stability constants (logKn) were calculated from the stoicheiometric constants by use of the equations ���������� Log K1 = logk1 + 2.30������� logK2 = log k2 + 1.15 For the copper and nickel complexes of both (1) and (II) log Kav is greater than pKD; such a situation has been reported in only a few instances. ��� From the data obtained with chloride as a supporting medium, approximate stoicheiometric stability constants were calculated for the chloro complexes MCl+ (M = Zn, Cd, Pb) in 74.5 vol. % dioxan. The values obtained were: ZnCl+, 5.0; CdCl+, 5.7; PbCl+, 5.0.

Thio derivatives of β-diketones and their metal chelates. IX. Nickel and copper complexes of some new fluorinated monothio-β-diketones

1968 ◽  
Vol 21 (7) ◽  
pp. 1781 ◽  
Author(s):  
RKY Ho ◽  
SE Livingstone
Keyword(s):  
General Formula ◽  
High Spin ◽  
Copper Complexes ◽  
Nickel Complexes ◽  
Metal Chelates ◽  
Sulphur Atom ◽  
Derivatives Of ◽  
Infrared Data

Four new fluorinated monothio-β-diketones of general formula RC(SH)=CH- COCF3 have been prepared; they are: l,l,l-trifluoro-4-mercapto-4-(4-methylphenyl)but-3-en-2-one (R = p-methylphenyl), 1,1,1-trifluoro-4-mercapto-4- (4-methoxyphenyl)but-3-en-2-one (R = p-methoxyphenyl), 4-(4-bromophenyl)-l,l,l- trifluoro-4-mercaptobut-3-en-2-one (R = p-bromophenyl), and l,l,l-trifluoro-4- (2-furyl)-4-mercaptobut-3-en-2-one (R = 2-furyl). Their nickel complexes, which are brown and diamagnetic, yield stable high-spin bis-pyridine adducts. When R = p-MeC6H4, p-MeOC6H4, or p-BrC6H4 the ligand yields both copper(1) and copper(11) complexes but when R = 2-furyl only a copper(11) complex is obtained. Infrared data indicate that in the copper(1) complexes the ligand is coordinated through the sulphur atom only.

Thio derivatives of β-Diketones and their metal chelates. XV. Mass spectra of cobalt(III) and rhodium(III) chelates of some fluorinated Monothio-β-diketones

1974 ◽  
Vol 27 (6) ◽  
pp. 1177 ◽  
Author(s):  
M Das ◽  
SE Livingstone
Keyword(s):  
Thermal Degradation ◽  
Mass Spectrometer ◽  
Mass Spectra ◽  
Cobalt Complexes ◽  
Metal Chelates ◽  
Complex Ions ◽  
Molecular Ion ◽  
Derivatives Of ◽  
Bivalent State ◽  
Cobalt Chelates

The mass spectra of the cobalt(111) and rhodium(111) chelates of the fluorinated monothio-β-diketones RC(SH)=CHCOCF3 (R = Ph, p-MeC6H4, p-BrC6H4, p-FC6H4, and 2-thienyl) and of the cobalt(111) chelate of CH3C(SH)=CHCOCF3 have been obtained. The cobalt chelates do not give a peak for the molecular ion because of thermal degradation to the cobalt(11) complex CO(RCS=CHCOCF3)2, which then undergoes reactions in the mass spectrometer. Fluorine migration occurs with cobalt but not with rhodium. The cobalt complexes give rise to more metal-containing fragments than their rhodium analogues. Mechanisms are proposed for the reactions involving the metal-containing fragments. Cobalt undergoes valency changes to give cobalt(11) and cobalt(1) complex ions, whereas rhodium undergoes a valency change to the bivalent state only.

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