Coordination Properties of Tris(2-carboxyethyl)phosphine, a Newly Introduced Thiol Reductant, and Its OxideClick to copy article linkArticle link copied!
Abstract

Acid−base properties and metal-binding abilities of tris(2-carboxyethyl)phosphine (TCEP), a newly introduced thiol group protectant, were studied in solution, using potentiometry, 1H and 31P NMR, and UV−vis spectroscopy, and also in the solid state by X-ray diffraction. Stability constants of complexes of the P-oxide of TCEP (TCEPO) were established by potentiometry. The list of metal ions studied included Ni(II), Cu(II), Zn(II), Cd(II), and Pb(II). Cu(II) catalyzed oxidation of TCEP to TCEPO. For all other systems ML complexes were found as major species at neutral pH with TCEP and TCEPO. Monoprotonated MHL species were also detected in weakly acidic conditions for all TCEP complexes and for the Pb(II) complex of TCEPO, while hydrolytic MH-1L complexes were found for TCEP at the weakly alkaline pH range. The NiL4 complex was found to form at excess of TCEP. Overall, the complexes were found to be rather weak, with log βML values around 3−5 for TCEP and 1.5−2.5 for TCEPO. The phosphorus pKa value for TCEP, 7.68, suggests that it can be a good buffer for studies at physiological pH.
†
University of Wrocław.
‡
Wrocław University of Technology.
§
Technical University of Łódź.
*
Corresponding author. E-mail: [email protected]. Tel: +48-22-6597072 ext 2353. Fax: +48-22-6584636.
‖
Polish Academy of Sciences.
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