Detailed Information on Publication Record
2009
Lanthanide(III) Complexes of 2-[4,7,10-Tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic Acid (H7DOA3P): Multinuclear-NMR and Kinetic Studies
CAMPELLO, Maria Paula, Marina BALBINA, Isabel SANTOS, Přemysl LUBAL, Radek ŠEVČÍK et. al.Basic information
Original name
Lanthanide(III) Complexes of 2-[4,7,10-Tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic Acid (H7DOA3P): Multinuclear-NMR and Kinetic Studies
Name in Czech
Ln(III) komplexy 2-[4,7,10-Tris(fosfonomethyl)-1,4,7,10-tetraazacyklododekan-1-yl]octové kyseliny (H7DOA3P): Multinukleární-NMR a kinetická studia
Authors
CAMPELLO, Maria Paula (620 Portugal), Marina BALBINA (620 Portugal), Isabel SANTOS (620 Portugal), Přemysl LUBAL (203 Czech Republic, guarantor), Radek ŠEVČÍK (203 Czech Republic) and Romana ŠEVČÍKOVÁ (203 Czech Republic)
Edition
Helvetica Chimica Acta, Zürich, Switzerland, Verlag Helvetica Chimica Acta AG, Zürich, 2009, 0018-019X
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10402 Inorganic and nuclear chemistry
Country of publisher
Switzerland
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 1.435
RIV identification code
RIV/00216224:14310/09:00037429
Organization unit
Faculty of Science
UT WoS
000272434000019
Keywords (in Czech)
Makrocykly; lanthanidové komplexy; NMR spektroskopie; kinetika; protonační konstanty
Keywords in English
Macrocycles; Lanthanide complexes; NMR Spectroscopy; Kinetics; Protonation constants
Tags
International impact, Reviewed
Změněno: 8/4/2010 18:59, prof. RNDr. Přemysl Lubal, Ph.D.
V originále
The protonation constants of 2-[4,7,10-tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic acid (H7DOA3P) and of the complexes [Ln(DOA3P)]4- (Ln=Ce, Pr, Sm, Eu, and Yb) have been determined by multinuclear NMR spectroscopy in the range pD 2-13.8. Seven out of eleven protonation steps were detected (pK=13.66, 12.11, 7.19, 6.15, 5.77, 2.99, and 1.99), and the values found compare well with the ones for other related ligands. The protonation sequence for H7DOA3P was also tentatively assigned. Three protonation constants (pKMHL, pKMH2L, and pKMH3L) were determined for the lanthanide complexes. The acid-assisted dissociation of [Ln(DOA3P)]4- (Ln=Ce, Eu), in the region cH+=0.05-3.00 mol dm-3 and at different temperatures (25-60 degrees of Celsius), indicated that they have slightly the same kinetic inertness, being the [Eu(H2O)9]3+ aqua ion the final product for europium. The rates of complex formation for [Ln(DOA3P)]4- (Ln=Ce, Eu) were studied by UV/VIS spectroscopy in the pH range 5.6-6.8.
In Czech
Protonační konstanty uvedeného ligandu H7DOA3P a jeho komplexů [Ln(DOA3P)]4- (Ln=Ce, Pr, Sm, Eu, and Yb) byly stanoveny pomocí multinukleární NMR spektroskopie v rozsahu pD 2-13.8. Sedm z 11 protonačních kroků bylo detekováno (pK=13.66, 12.11, 7.19, 6.15, 5.77, 2.99, and 1.99) a nalezené hodnoty byly porovnány s těmi stanovenými pro analogické ligandy. Bylo navrženo taktéž protonační schema ligandu. Tři protonační konstanty (pKMHL, pKMH2L, and pKMH3L) byly stanoveny pro Ln(III) komplexy. Kysele katalyzovaný rozklad [Ln(DOA3P)]4- komplexů (Ln=Ce, Eu), v oblasti cH+=0.05-3.00 mol dm-3 a rozdílných teplotách (25-60 st. C), ukazuji na na podobnou kinetickou inertnost, kdy [Eu(H2O)9]3+ aqua ion je konečný produkt disociační reakce. Rychlost vzniku komplexů [Ln(DOA3P)]4- (Ln=Ce, Eu) byly studovány pomocí UV/VIS spektroskopie v rozsahu pH 5.6-6.8.
Links
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