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Coordination Chemistry of Actinide and Lanthanide Ions

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Coordination Chemistry of Actinide and Lanthanide Ions Coordination Chemistry of Actinide and Lanthanide Ions Ildikó Farkas Doctoral Thesis Stockholm 2001 Department of Chemistry Inorganic Chemistry Royal Institute of Technology S-100 44 Stockholm, Sweden Department of Chemistry Inorganic Chemistry Royal Institute of Technology S-100 44 Stockholm, Sweden Coordination Chemistry of Actinide and Lanthanide Ions Ildikó Farkas AKADEMISK AVHANDLING som med tillstånd av Kungliga Tekniska Högskolan framlägges till offentlig granskning för avläggande av filosofie doktorsexamen i oorganisk kemi, fredagen den 26 oktober 2001, kl 14.00 i K2, KTH. Fakultetsopponent är Professor Staffan Sjöberg. Avhandlingen försvaras på engelska. Abstract Water exchange of the actinide ions, U(IV), U(VI) and Th(IV), in 4 m NaClO4 media as well as coordination chemistry of lanthanide(III) ions with the glycolate ligand are discussed in this thesis. 2+ 4+ 3+ The activation parameters for the water exchange reaction of UO2 (aq), U (aq), UF (aq) and a lower limit for the water exchange rate constant at room temperature for Th4+(aq) have been determined by 17O NMR relaxation techniques. For the paramagnetic U4+(aq) and UF3+(aq) ions, 2+ 4+ the water exchange was studied directly, while for the diamagnetic UO2 (aq) and Th (aq), 3+ 2+ Tb (aq) was used as a chemical shift reagent. The results for UO2 are in fairly good agreement 2+ with other kinetic data. It is interesting to note that in contrast to UO2 , the rate of water exchange on U4+ is not significantly influenced by ligands as OH- or F-. Based on the known coordination 2+ geometry of UO2 (aq) and also using information obtained in quantum chemical calculations, an 2+ associative or interchange mechanism was suggested for the water exchange in UO2 (aq). The calculated activation energy is in agreement with the experimental data. Since the coordination number of water in U4+(aq) is uncertain, 9 or 10, it is rather difficult to make propositions about the mechanism of the water exchange for this ion. However, the experimental data indicate an interchange mechanism. The complexation at high pH between glycolate and different lanthanide(III) ions, Sm3+, Eu3+, Dy3+, Er3+ and Lu3+ has been studied by potentiometry and spectroscopic techniques. Based on this information a series of di- and tetranuclear ternary complexes were identified. By combination of the experimental information from solid-state structures, spectroscopy and potentiometry, the proposed constitution of these complexes are 2- -x [Ln2(OCH2COO)2(HOCH2COO)4(H2O)x] and [Ln4(OCH2COO)4(OCH2COO)x(HOCH2COO)4-x] , with x = 2-4. The oxyacetate is formed by deprotonation of the α-OH group in the glycolate as a result of the very strong inductive effect of the metal ion. The “Ln4(OCH2COO)4” unit has a cubane like structure where the oxy group act as a bridge between three Ln atoms. A structure study is also part of the work, providing supporting information about the formation of oxyacetate complexes. The crystal structure of the sodium salt of the uranyl- oxyacetate-fluoride dimer, Na4(UO2)2(OCH2COO)2F4·6H2O as well as that of some lanthanide- glycolates, Lu(HOCH2COO)3·2H2O and Dy2(OCH2COO)2(HOCH2COO)2·4H2O, have been determined by single crystal X-ray diffraction. In the Dy2(OCH2COO)2(HOCH2COO)2·4H2O structure with a dysprosium-oxyacetate dimer core, the dysprosium ions have a coordination number of eight and the geometry is distorted dodecahedral. The structure consists of a three- dimensional network of cross-linked metal-ligand chains, while the other lanthanide crystal, + Lu(HOCH2COO)3·2H2O, consists of discrete eight-coordinated cationic Lu(HOCH2COO)2(H2O)4 - and anionic Lu(HOCH2COO)4 complexes. Keywords: water exchange, dynamics, uranium(IV), uranyl, thorium(IV), aqua ions, fluoride, 17O NMR relaxation techniques, terbium(III), potentiometry, lanthanides, glycolate, α-OH group, deprotonation, X-ray crystallography, TRLFS, NMR. Preface This work was started at Inorganic Chemistry, KTH as a joint venture with the Physical Chemistry Department, Lajos Kossuth University (KLTE), Debrecen, Hungary. I entered the project at the KLTE in September 1996, and one year later I continued it at the Department of Chemistry, Inorganic Chemistry, Royal Institute of Technology, Stockholm. My supervisors at that time were István Bányai and Professor Ingmar Grenthe. I took the licentiate exam in 1999 based on the water and electron exchange studies; the latter one is not part of this doctoral thesis. After one- year break in 2000 I started to work with potentiometry at the KTH under Prof. Ingmar Grenthe’s and Dr. Zoltán Szabó’s supervision. The thesis is based on the following publications: 2+ Paper I “Rates and Mechanisms of Water Exchange of UO2 (aq) and - 17 19 UO2(oxalate)F(H2O)2 : A Variable Temperature O and F NMR Study.” Ildikó Farkas, István Bányai, Zoltán Szabó, Ulf Wahlgren and Ingmar Grenthe Inorg. Chem. 2000, 39(4), 799 Paper II “The Rates and Mechanisms of Water exchange of Actinide Aqua 17 4+ Ions: A Variable Temperature O NMR study of U(H2O)10 , 3+ 4+ UF(H2O)9 , and Th(H2O)10 .” István Bányai, Ildikó Farkas and Ingmar Grenthe J. Phys. Chem. A 2000, 104, 1201 Paper III “Crystal structure of the sodium salt of the uranyl-oxyacetate-fluoride dimer, Na4(UO2)2(OCH2COO)2F4·6H2O.” Ildikó Farkas, Ingeborg Csöregh and Zoltán Szabó Acta Chem. Scand. 1999, 53, 1009 Paper IV “Crystal structure of some lanthanide(III)-glycolate complexes, Lu(HOCH2COO)3·2H2O and Dy2(OCH2COO)2(HOCH2COO)2·4H2O. An X-ray Diffraction and Vibrational Spectroscopic Study.” Ildikó Farkas, Andreas Fischer and Martin Lindsjö submitted to J. Chem. Soc., Dalton Trans. Paper V “Complexation of Cm(III) and lanthanide(III) ions by glycolic acid: TRLFS, potentiometric, vibrational and NMR spectroscopic studies.” Thorsten Stumpf, Ildikó Farkas, Thomas Fanghänel, Zoltán Szabó and Ingmar Grenthe under way Table of Contents I Introduction 1 II Water Exchange on Actinide Ions 4 II.1 Background 4 II.1.1 General remarks 4 II.1.2 Previous studies on the water exchange of uranyl ion 5 II.2 Experimental methods 6 II.2.1 NMR relaxation techniques 6 II.2.2 Determination of activation parameters 10 II.3 Study on the water exchange of actinide ions 11 II.3.1 An important parameter: the coordination number of aqua ions 11 II.3.2 Conclusions 13 III Coordination Chemistry of Lanthanide(III)-, Uranyl- and Actinide(III)- Glycolate Systems 20 III.1 General remarks 20 III.2 Previous studies on the complexation of uranyl and lanthanide(III) with glycolate ligand 21 III.2.1 Complexation of glycolate with uranyl ion 22 III.2.1 Complexation of glycolate with lanthanide(III) ions 22 III.3 Potentiometric study on lanthanide(III)-glycolate systems 23 III.3.1 Experimental background 23 III.3.1.1 Solution chemical equilibrium 23 III.3.1.2 Equilibrium analysis by potentiometry 23 III.3.1.2.1 Measurement of [H+] with glass electrode 24 III.3.1.2.2 Equilibrium calculations in a three-component metal-ligand-proton system 25 III.3.1.2.3 A special case: a three-component system reduced to two components 28 III.3.1.3 Activity coefficients 30 III.3.2 Potentiometric titration results in lanthanide-glycolate systems 32 III.4 Spectroscopic studies on lanthanide(III)- and actinide(III)- glycolate solutions 35 III.4.1 Time resolved laser fluorescence spectroscopic study of actinide(III)-glycolate solutions 35 III.4.2 Vibrational spectroscopic measurements in Dy(III)- glycolate solutions 37 III.4.3 Lu(III)-glycolate solutions studied by NMR spectroscopy 37 III.5 Crystallographic study on lanthanide(III)- and uranyl- glycolate complexes 39 III.5.1 Crystal structure of a uranyl-oxyacetate-fluoride dimer 40 III.5.2 Crystal structure of some lanthanide(III)-glycolate and oxyacetate complexes 42 III.5.2.1 Crystal structure of Lu(HOCH2COO)3·2H2O 42 III.5.2.2 Crystal structure of Dy2(OCH2COO)2(HOCH2COO)2·4H2O 44 III.6 Constitution and structure of the lanthanide- glycolate/oxyacetate complexes 46 IV Conclusions and Future Work 48 References 50 I Introduction Study of water exchange of some actinide ions in aqueous solution, as well as the coordination chemistry of lanthanide-glycolate complexes are discussed in this thesis. In coordination chemistry, simple chemical systems are used to develop and verify the scientific theories that are necessary to predict the behaviour of more complicated systems. The study of the water exchange and the coordination chemistry of actinide ions in aqueous solution is necessary for the understanding of homogeneous and heterogeneous chemical processes in which these ions are involved. Examples of such processes range from laboratory systems to the much more complex ones encountered in engineering (such as nuclear fuel reprocessing plants or repositories for radioactive waste) or in nature (geochemical processes for uranium ore formation, or the transport of radionuclides in ground and surface water systems). There are large chemical similarities between the chemistry of the M3+ ions in the lanthanide and actinide groups, but differences also occur and they can be exploited e.g. to find new methods for their separation, a difficult task, as their chemical characteristics are very similar. Lanthanide complexes are becoming more and more important in medical diagnostic techniques using NMR spin imaging, in catalysis and in organic synthesis, which is another reason to develop a deeper understanding of their chemistry. The chemical properties of the elements are determined by their electron structure. In the lanthanide series the electrons of the 4f sub-shell are practically part of the core therefore the +3 oxidation state, studied here, dominates their chemistry. The chemical properties in the same oxidation state of the 4f and 5f elements are very similar. When studying the chemistry of the lanthanides, one often observes smooth changes between the elements, which can be attributed to the ionic radius decreasing with the atomic number along the series.
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