Potential lanthanide ion selective reagents. 3. Metal complex formation with 1,7-diaza-4,10-13-trioxacyclopentadecane-N,N'-diacetic acid

Journal Article · Wed Jan 29 00:00:00 EST 1986 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00223a025· OSTI ID:5974587

Chang, C A; Ochaya, V O

Stability constants for the ligand 1,7-diaza-4,10,13-trioxacyclopentadecane-N,N'-diacetic acid (dapda or K21DA) with the lanthanides and several other metal ions have been determined at 25 /sup 0/C in aqueous 0.1 M (CH/sub 3/)/sub 4/NCl medium by a potentiometric method. The results obtained are compared to those obtained for a similar ligand of large cavity size, 1,20-diaza-4,7,13,16-tetraoxacyclooctadecane-N,N'-diacetic acid (dacda or K22DA), which has been previously studied and reported. The stability of dapda is found to reach a peak at Eu(III) with the lanthanide series and is rationalized in terms of the matching of the ligand properties with metal ion characteristics. The transition-metal ions Ni(II), Cu(II), and Zn(II) all form stronger dapda (as compared to dacda) complexes due to a better match of the ligand cavity size and metal ion radius. 18 references, 3 figures, 1 table.

• Research Organization: Univ. of Texas, El Paso
• DOE Contract Number: FG05-84ER13292
• OSTI ID: 5974587
• Journal Information: Inorg. Chem.; (United States), Vol. 25:3
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPPER COMPLEXES
CHEMICAL PREPARATION
STABILITY
DIAZO COMPOUNDS
NICKEL COMPLEXES
ORGANIC ACIDS
RARE EARTH COMPLEXES
ZINC COMPLEXES
CATIONS
COPPER
EXPERIMENTAL DATA
LIGANDS
MEDIUM TEMPERATURE
NICKEL
POTENTIOMETRY
RARE EARTHS
ZINC
CHARGED PARTICLES
COMPLEXES
DATA
ELEMENTS
INFORMATION
IONS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
SYNTHESIS
TITRATION
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400201 - Chemical & Physicochemical Properties