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  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamics of Substituted Rhodanine III: Potentiometric and Spectrophotometric Studies of Complexes of Some Transition Metals with 3-Phenylsulfonamidorhodanine (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 1259-1265 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. 3-Phenylsulfonamidorhodanine; Dissociation; Stability constants; Thermodynamic parameters..
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Dissoziationskonstanten von 3-Phenylsulfonamidorhodanin (PSR) in 0.1 M KCl und 60% (v/v) Ethanol-Wasser wurden potentiometrisch ermittelt. Die stufenweisen Stabilitätskonstanten seiner Komplexe mit Mn2+, Co2+ Ni2+, Zn2+, La3+, Ce3+, Gd3+, UO2+ und Th4+ wurden bestimmt. Die Stabilitätsreihenfolge lautet Th4+ 〉 UO2+ 〉 Gd3+ 〉 La3+ 〉 Mn2+ 〈 Co2+〈 Ni2+ 〈 Cu2+ 〉 Zn2+. Die thermodynamischen Parameter von PSR und seinen Komplexen werden diskutiert. Der Dissoziationsprozeß verläuft nicht-spontan, endotherm und entropisch ungünstig. Die Komplexbildung ist spontan, exo- oder endotherm je nach Metall und entropisch begünstigt. Die Zusammensetzung der Komplexe wurde spektrophotometrisch bestimmt; es entstehen 1:1- und 1:2-Komplexe (Metall:Ligand)..
    Notes: Summary.  The dissociation constants of 3-phenylsulfonamidorhodanine (PSR) were determined potentiometrically in 0.1 M KCl and 20% (v/v) ethanol-water. The stepwise stability constants of the complexes of Mn2+, Co2+, Ni2+, Cu2+, Zn2+,La3+, Ce3+, Gd3+, UO2+ 2, and Th4+ with PSR were determined. The stabilities of the complexes were found as follows: Th4+ 〉 UO2+ 2 〉 Gd3+ 〉 Ce3+ 〉 La3+ 〉 Mn2+〈 Co2+ 〈 Ni2+ 〈 Cu2+ 〉 Zn2+. The thermodynamic parameters for PSR and its complexes were evaluated and discussed. The dissociation process is non-spontaneous, endothermic, and entropically unfavourable. The formation of the complexes was found to be spontaneous, exothermic or endothermic (depending on the metal), and entropically favourable. The stoichiometries of the complexes were determined spectrophotometrically and indicate the formation of 1:1 and 1:2 (metal:ligand) complexes..
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010137
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  • 2
    Electronic Resource
    Electronic Resource
    N-picolinamido-N′-benzoylthiocarbamide transition metal complexes (1997)
    Springer
    Transition metal chemistry 22 (1997), S. 381-384 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new series of CoII, NiII and CuII complexes derived from N-picolinamido-N′-benzoylthiocarbamide has been prepared in which the Schiff base ligand is tridentate and/or bidentate, containing a potential ONS donor. The complexes have been characterized by elemental analyses, 1H-n.m.r., magnetic susceptibility, i.r., u.v., e.p.r. and thermal analyses. Stereochemistries are proposed for the complexes on the basis of the spectral and magnetic studies. The i.r. data indicate that the carbonyl oxygen of the benzoyl moiety constituents chelating backbone in most complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018570003995
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  • 3
    Electronic Resource
    Electronic Resource
    New uranyl(VI) complexes with ons ligand derived from aromatic acid hydrazides and phenyl isothiocyanate. part III (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 328-330 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The synthesis and characterization of some dioxouranium(VI) complexes containing potential ONS donor ligands derived from benzoyl,o-chloro-,o-methyl-,P-chloro-,p-nitro-,p-methoxy-,p-aminobenzoylhydrazines and isonicotinylhydrazine with phenyl isothiocyanate are reported. Two types of complexes with general formulae [UO2(HL)2(X)2] and [[UO2(HL)2] have been identified and characterized. All the uranyl complexes are of the [UO2(HL)2(X)2] type (HL=bidentate monoanionic ligand, X=H2O and/or EtOH) and X bridges the uranyl ion and the thioketo groupvia hydrogen bonding. Upon heating to 140 °C, the complexes lose X giving a new complex of formula [UO2(HL)2] (HL=tridentate monoanionic ligand) in which the thioketo-group participates in bonding. The latter complexes take up X again on exposure to water and/or ethanol vapour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01036392
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  • 4
    Electronic Resource
    Electronic Resource
    Dioxouranium(VI) complexes of aliphatic (mono- and di-) hydrazone-oximes (1991)
    Springer
    Transition metal chemistry 16 (1991), S. 23-27 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Uranyl acetate dihydrate reacts with several hydrazone-oximes, derived from aliphatic (mon-annd di-) hydrazides and 2,3-butanedione monoxime in the absence of NaOAc, to form complexes of general formulae [UO2(HL)2] and [UO2(HL)2SZ] (where H2L=aliphatic acid monohydrazone-oximes; S=EtOH and Z=H2O). With aliphatic acid dihydrazone and monomaleoyl-hydrazone-oximes, different complexes have been synthesized in 50% EtOH and in the absence of NaOAc. The products have been characterized by elemental analyses, molar conductivities, spectral (u.v., i.r., n.m.r.), pH, conductometric titrations, molecular weights and magnetic measurements. I.r. spectral data indicate that the aliphatic hydrazone-oximes, except monomaleoyl-hydrazone-oxime, behave in a similar way to tridentate ligandsvia the azomethine nitrogen and the NOH groups, with replacement of a hydrogen atom from the latter group. On the other hand, malonyl dihydrazone- and adipoyldihydrazone-oximes coordinate in a bi-, and tridentate manner, respectively, towards one uranyl ion, while monomaleoyl- and oxaloyldihydrazone-oximes behave in a penta-and hexadentate fashion, respectively, towards two uranyl ions. Elemental analyses, molecular weight measurements as well as spectral data confirm the existence of a binuclear complex for monomaleoyl- and oxaloyldihydrazone-oximes, whereas a monomer for the rest. Finally, the role of solvent, absence of NaOAc and the type of ligand on the structure of the complexes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01127864
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