Thermodynamics, PMR, and fluorescence studies for the complexation of trivalent lanthanides, Ca[sup 2+], Cu[sup 2+], and Zn[sup 2+] by diethylenetriaminepentaacetic acid bis(methylamide)

Journal Article · Wed Mar 03 04:00:00 EST 1993 · Inorganic Chemistry; (United States)

DOI:https://doi.org/10.1021/ic00057a016· OSTI ID:6725282

Rizkalla, E N; Choppin, G R ^[1]; Cacheris, W ^[2]

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1. Florida State Univ., Tallahassee (United States)
2. Salutar Imaging, Sunnyvale, CA (United States)

[sup 1]H-NMR shift data were measured for the diamagnetic La[sup 3+] and Lu[sup 3+] complexes with diethylenetriaminepentaacetate-N,N[prime]-bis(methylamide) (DTPA-BMA) at different temperatures. Quartet splitting of the methylene protons of the terminal acetate groups and of the amide groups upon complexation with metal ions is indicative of long-lived metal-nitrogen bonds and short-lived metal-oxygen bonds. The observation of two quartets for the terminal acetates and the splitting of the N-methyl singlet upfield is attributed to the presence of more than one conformation in solution. Thermodynamic data indicate that DTPA-BMA acts as an octadentate ligand toward lanthanide ions and possibly as a hexadentate ligand toward Ca[sup 2+], Cu[sup 2+], and Zn[sup 2+] ions. Fluorescence data for the Eu[sup 3+] complex support the octadentate behavior of the ligand toward lanthanides and indicate that the complex contains one coordinated water molecule. 16 refs., 4 figs., 4 tabs.

• OSTI ID: 6725282
• Journal Information: Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 32:5; ISSN 0020-1669; ISSN INOCAJ
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPLEXES
AMIDES
AMINO ACIDS
CALCIUM COMPLEXES
CARBOXYLIC ACIDS
CHELATES
CHELATING AGENTS
COMPLEXES
COPPER COMPLEXES
DRUGS
DTPA
EMISSION SPECTROSCOPY
FLUORESCENCE SPECTROSCOPY
HYDRATES
LANTHANUM COMPLEXES
MAGNETIC RESONANCE
MOLECULAR STRUCTURE
NUCLEAR MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIOPROTECTIVE SUBSTANCES
RARE EARTH COMPLEXES
RESONANCE
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
ZINC COMPLEXES