Dissertation/Thesis Abstract

Hydroxyl radical reaction and lanthanide ion complexation kinetics of DTPA
by Cullen, Thomas Donovan, M.S., California State University, Long Beach, 2013, 63; 1524188
Abstract (Summary)

The rate constants for hydroxyl radical reaction with multiple protonated forms of free diethylenetriaminepentaacetic acid {DTP A) as well as with DTPA complexed with a number of lanthanide metal ions were determined using electron pulse radio lysis and transient absorption spectroscopy. The rate constants for the most protonated DTP A species were ≈ 2.5 x 10 9 M-1s-1, but for H2-DTPA 3- a higher value of 4.1 x 109 M-1s -1 at 20-23 °C was obtained. Thermodynamic parameters were also determined for these protonated DTPA species. The metal-complexed DTPA rate constants at pH 3.0-5.0 were typically faster than for the free DTP A values, and varied depending on the metal IOn.

The complexation kinetics ofDTPA with multiple lanthanide metal ions was measured using a stopped-flow system. The measured rate constants ranged from 103-104 M-1s-1. Thermodynamic parameters were also determined for both the complexation ofEu 3+ and Lu3+. It was observed that as the ionic radius of the metal ion being complexed increased, so did the complexation rate constant.

This study will increase understanding of the chemistry occurring within TALSPEAK, which is necessary in order to optimize this process.

Indexing (document details)
Advisor: Mezyk, Stephen P.
Commitee: Brazier, Christopher R., Li, Lijuan, Slowinski, Krzysztof
School: California State University, Long Beach
Department: Chemistry
School Location: United States -- California
Source: MAI 52/03M(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Inorganic chemistry, Organic chemistry
Keywords:
Publication Number: 1524188
ISBN: 9781303521652
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