Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Physico-chemical studies on the chelation behaviour of biologically active 2-hydroxy-1-naphthaldehyde semicarbazone (HNAS) with some lanthanons (1992)
    Springer
    Monatshefte für Chemie 123 (1992), S. 25-33 
    Details
    ISSN: 1434-4475
    Keywords: Potentiometry ; Formation constant ; 2-Hydroxy-1-naphthaldehyde semicarbazone (HNAS) ; Lanthanons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Chelierungsverhalten von La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Y3+, Tb3+, Dy3+ und Ho3+ mit 2-Hydroxy-1-naphthaldehydsemicarbazon (HNAS) wurde potentiometrisch in 75% (v/v) Dioxan-Wasser bei verschiedenen Ionenstärken untersucht. Die Werte für n undpL wurden nach der Methode von Bjerrum und Calvin in der Modifikation von Irving und Rossotti bestimmt. Die Komplexbildungskonstanten der Metallchelate und die WerteS min wurden ermittelt. Die Reihung der Komplexbildungskonstanten war La3+〈Ce3+〈Pr3+〈Nd3+〈Sm3+〈Eu3+〈Gd3+〈Y3+〈Tb3+〈Dy3〈Ho3+.
    Notes: Summary The chelation behaviour of the complexes of La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Y3+, Tb3+, Dy3+, Ho3+ with biologically active 2-Hydroxy-1-naphthaldehyde semicarbazone (HNAS) has been studied potentiometrically in 75% (v/v) dioxane-water medium at various ionic strengths. The method of Bjerrum and Calvin, as modified by Irving and Rossotti has been used to find out the values of n andpL. The formation constants of metal chelates and the values ofS min have been calculated. The order of formation constants of chelates was found to be: La3+〈Ce3+〈Pr3+〈Nd3+〈Sm3+〈Eu3+〈Gd3+〈Y3+〈Tb3+〈Dy3+〈Ho3+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045293
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Potentiometric studies on the complexation equilibria between some trivalent lanthanide metal ions and biologically active 2-hydroxy-1-naphthaldehyde thiosemicarbazone (HNATS) (1992)
    Springer
    Monatshefte für Chemie 123 (1992), S. 883-889 
    Details
    ISSN: 1434-4475
    Keywords: Lanthanide metal ion ; 2-Hydroxyl-1-naphthaldehyde thiosemicarbazone (HNATS) ; Formation constant ; Potentiometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde das Chelierungsverhalten einiger trivalenter Lanthanidenionen mit biologisch aktivem 2-Hydroxy-1-naphthaldehyd-thiosemicarbazon (HNATS) mittels potentiometrischer Messungen bei 20±0.5°C in 75% (v/v) Dioxan-Wasser bei verschiedener Ionenstärke an Natriumperchlorat untersucht. Die Methode nach Bjerrum und Calvin in der Modifikation nach Irving und Rossotti wurde zur Ermittlung der Werte $$\bar n$$ (mittlere Anzahl an Liganden pro Metallion) undpL (Exponent an freiem Liganden) verwendet. Die Komplexbildungskonstanten wurden in Anlehnung an Sullivan et al. an einem PC-XT Computer errechnet. DieS min-Werte (S min=χ2) wurden ebenfalls bestimmt. Die Reihung der Chelatbildungskonstanten war: La3+〈Ce3+〈Pr3+〈Nd3+〈Sm3+〈Eu3+〈Gd3+〈Y3+〈Tb3+〈Dy3+. Die Bildungskonstanten sind mit der Größe und dem Ionisierungspotential der Metallionen zu korrelieren.
    Notes: Summary The chelation behaviour of some trivalent lanthanide and yttrium metal ion with biologically active 2-hydroxy-1-naphthaldehyde thiosemicarbazone (HNATS) has been investigated by potentiomotric measurements at 20±0.5°C in 75% (v/v) dioxane-water medium at various ionic strengths of sodium perchlorate. The method of Bjerrum and Calvin, as modified by Irving and Rossotti has been used to find out the values of $$\bar n$$ (average number of ligand bound per metal ion) andpL (free ligand exponent). The formation constants of metal chelates have been computed on a PC-XT computer, using a program patterned after that of Sullivan et al. to give β n values using weighted least squares method. TheS min values (S min =χ2) have been calculated. The order of formation constants of chelates was found to be: La3+〈Ce3+〈Pr3+〈Nd3+〈Sm3+〈Eu3+〈Gd3+〈Y3+〈Tb3+〈Dy3+. The formation constants of the chelates formed have been correlated to size and ionization potentials of the metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811543
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Stabilities of some bivalent transition metal ions with 2-hydroxy naphthaldehyde semicarbazones and thiosemicarbazones in dioxane-water mixtures: A potentiometric study (1992)
    Springer
    Monatshefte für Chemie 123 (1992), S. 1099-1105 
    Details
    ISSN: 1434-4475
    Keywords: Bivalent metal ion ; 2-hydroxy-1-naphthaldehyde derivatives ; formation constant ; potentiometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die Gleichgewichte zwischen 2-Hydroxynaphthaldehyd-Semicarbazonen und -Thiosemicarbazonen einerseits und Proton oder zweiwertigen Übergangsmetallionen andererseits potentiometrisch bei einer konstanten Ionenstärke und verschiedenen Zusammensetzungen von Dioxan und Wasser als gemischtem Lösungsmittel untersucht. Die Methode von Bjerrum und Calvin nach der Modifikation von Irving und Rossotti wurde zur Evaluierung der Werte fürn undpL verwendet. Die Stabilitätskonstanten und β n -Werte wurden nach Sullivan et al. berechnet. Die WerteS min=χ2 wurden ebenfalls bestimmt. Die Reihenfolge der Stabilitätskonstanten war UO 2 2+ 〉 Cu2+ 〉 Ni2+ 〉 Co2+ 〉 Zn2+ 〉 Pb2+ 〉 Cd2+ 〉 Mn2+ 〉 Mg2+. Außerdem wurde der Effekt wechselnder Dielektrizitätskonstanten des Lösungsmittels auf die Stabilitätskonstanten der Komplexe bei einer Ionenstärke von 0.100M NaClO4 und einer Temperature von 20±0.5°C untersucht.
    Notes: Summary Equilibria between 2-hydroxy naphthaldehyde derivatives (semicarbazone and thiosemicarbazone) and proton or some bivalent metal ions have been investigated potentiometrically at a constant ionic strength and different compositions of the mixed solvent (dioxane: water). The method of Bjerrum and Calvin [1, 2], as modified by Irving and Rossotti [3], has been used to determine the values ofn andpL. The stability constants have been calculated following Sullivan et al. [4] to give β n values. The values ofS min=χ2 have also been calculated. The order of stability constants was found to be found to be UO 2 2+ 〉 Cu2+ 〉 Ni2+ 〉 Co2+ 〉 Zn2+ 〉 Pb2+ 〉 Cd2+ 〉 Mn2+ 〉 Mg2+. The effect of varying the dielectric constant of the medium on the stability constants of the complexes has also been investigated at an ionic strength of 0.100M NaClO4 and a temperature of 20±0.5°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808272
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Potentiometric studies on the chelation behaviour of lanthanons with 3-hydroxy-2-methyl-1,4-naphthoquinone (HMNQ) (1986)
    Springer
    Monatshefte für Chemie 117 (1986), S. 459-463 
    Details
    ISSN: 1434-4475
    Keywords: Potentiometry ; Stability constants ; Dissociation constant ; 3-Hydroxy-2-methyl-1,4-naphthoquinone ; Lanthanides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Komplexierungsverhalten der Komplexe von La(III), Pr(III), Nd(III), Y(III), Sm(III) und Tb(III) mit 3-Hydroxy-2-methyl-1,4-naphthochinon wurde potentiometrisch in 75% (v/v) wäßrigem Dioxan bei verschiedenen Ionenstärken untersucht. Die Methode vonBjerrum undCalvin in der Modifikation nachIrving undRossotti wurde zur Bestimmung der Werte für $$\mathop n\limits^ -$$ undpL benutzt. Es wurden die Stabilitätskonstanten und dieS min -Werte berechnet; die Stabilitätskonstanten ergaben folgende Reihung: La〈Pr〈Nd〈Sm〈Tb.
    Notes: Abstract The chelation behaviour of complexes of La(III), Pr(III), Nd(III), Y(III), Sm(III) and Tb(III) with 3-hydroxy-2-methyl-1,4-naphthoquinone has been studied potentiometrically in 75% (v/v) aqueous dioxan medium at various ionic strengths. The method ofBjerrum andCalvin, as modified byIrving andRossotti, has been used to find values of $$\mathop n\limits^ -$$ andpL. The stability constants and the values ofS min have been calculated. The order of stability constants was found to be: La〈Pr〈Nd〈Sm〈Tb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810894
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of rhodium after extraction with 3-hydroxy-2-methyl-1,4-naphthoquinone monoxime into molten naphthalene (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 819-819 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129785
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    2-Methyl-1,4-naphthoquinone-thiosemi-carbazone as a sensitive reagent for the spectrophotometric determination of osmium (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 311 (1982), S. 521-521 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Osmium ; Spektralphotometrie ; Me-thylnaphthochinon-thiosemicarbazon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00521182
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Acenaphthenequinonemonoxime as a spectrophotometric reagent for the determination of iridium by solvent extraction (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 268 (1974), S. 31-32 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Iridium mit Acenaphthenchinonmonoxim ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430905
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Titrimetric determination of indium with EDTA using 1,5-Di-β-naphthylthiocarbazone as an extractive indicator (1972)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 261 (1972), S. 392-393 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Indium mit 1 ; 5-Di-β-naphthylthiocarbazon ; ÄDTA-Titration ; Extraktionsindicator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00787002
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Titrimetric microdetermination of zinc with EDTA using 1,5-Di-β-naphthylthiocarbazone (HNDZ) as an extractive indicator (1972)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 259 (1972), S. 286-286 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204805
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Extractive spectrophotometric determination of ruthenium employing 2-methyl-1,4-naphthoquinone monoxime as a reagent (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 299 (1979), S. 128-128 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Ruthenium mit 2-Methyl-1,4-naphtochinon-monoxim ; Spektralphotometrie ; Extraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00518425
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...