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https://hdl.handle.net/10316/5209
Title: | Interaction of [Ln(DO2A)(H2O)2-3]+ and [Ln(DO2P)(H2O)2-3]- with phosphate, acetate and fluoride anions in aqueous solution | Authors: | Kimpe, K. d'Olieslager, W. Görller-Walrand, C. Figueirinha, A. Kovács, Z. Geraldes, C. F. G. C. |
Keywords: | Nuclear resonances; Lanthanides; Rare earths; MRI contrast agents | Issue Date: | 2001 | Citation: | Journal of Alloys and Compounds. 323-324:(2001) 828-832 | Abstract: | Mixed complexation of the lanthanide(III) chelates of the 1,7-disubstituted tetraazacyclododecane macrocycles DO2A and DO2P with phosphate, acetate and fluoride anions was studied in aqueous solutions using high resolution 1H and 31P NMR spectroscopy. The [La(DO2A)(H2O)2-3]+ and [Ce(DO2A)(H2O)2-3]+ chelates readily decompose in aqueous solutions containing phosphate anions. [Nd(DO2A)(H2O)2-3]+ and [Eu(DO2A)(H2O)2-3]+ chelates remain stable in an acetate environment. Association constants for the 1:1 adduct were obtained via 1H NMR titrations. In a fluoride environment, [La(DO2A)(H2O)2-3]+ was found to be unstable, in contrast to [Eu(DO2A)(H2O)2-3]+, for which the association constant for the 1:1 adduct was calculated. Chelate formation, as well as mixed complexation with fluoride and phosphate was studied for [Eu(DO2P)(H2O)2-3]-. The 31P chemical shifts of [Eu(DO2P)(H2O)2-3]- indicate that the DO2P macrocycle forms an [`]in-cage' complex with binding through all four nitrogens. The [Eu(DO2P)(H2O)2-3]- chelate gradually decomposes in a phosphate environment, but remains stable in an fluoride environment. | URI: | https://hdl.handle.net/10316/5209 | DOI: | 10.1016/S0925-8388(01)01154-9 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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