Structures of lanthanide-edta complexes

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dc.contributor.advisorIrving, H M N Hen_ZA
dc.contributor.advisorNassimbeni, Luigi Ren_ZA
dc.contributor.authorMullins, Jennifer Maryen_ZA
dc.date.accessioned2016-10-19T13:38:51Z
dc.date.available2016-10-19T13:38:51Z
dc.date.issued1983en_ZA
dc.descriptionBibliography: pages. 188-192.en_ZA
dc.description.abstractThe structures of six lanthanide-edta complexes were elucidated by X-ray diffraction, so as to ascertain exactly at which point the change from the nine-coordinate [Ln(edta)(H₂O)₃ ]- complex to the eight-coordinate [Ln(edta)(H₂O)₂]-complex occurs. The transition was found to occur at Erbium. The structures of the complexes K⁺[Ln(edta)(H₂O)₃ ].5H₂O for Ln=Praseodymium, Europium, Gadolinium and Holmium were elucidated and found to be isomorphous crystallizing in the orthorhombic space group Fdd1 with Z = 16. In each case , the central metal ion has a coordination mnnber of nine, being bonded to the hexadentate edta ligand and three water molecules. For each structure, anomalous dispersion corrections were applied since Fdd2 is a polar space group. The molecules of water of crystallization were seen to be partially disordered. The structures of the complexes K⁺[Ln(edta)(H₂O)₂ ].4H₂O for Ln =Erbium and Ytterbium were elucidated and found to be isomorphous. A space group problem arose with these two structures as there was a problem of pseudo-synunetry, in that the oolecules were arranged in a P2₁/n pattern, but the motif in fact resembled that of C2/c or Cc. The structures were finally refined in the centrosynnnetric, oonoclinic space group C2/c with Z = 4, but were found to be disordered. In fact, in each case, two independent structures were identified, one 'good' and one 'lesser' structure. A study of the 'good' structure in each case showed that the central metal ion has a coordination number of eight, being bonded to the hexadentate edta ligand and two water molecules. The technique of thermogravirretric analysis was employed in the study of the molecules of water of crystallization.en_ZA
dc.identifier.apacitationMullins, J. M. (1983). <i>Structures of lanthanide-edta complexes</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Chemistry. Retrieved from http://hdl.handle.net/11427/22209en_ZA
dc.identifier.chicagocitationMullins, Jennifer Mary. <i>"Structures of lanthanide-edta complexes."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Chemistry, 1983. http://hdl.handle.net/11427/22209en_ZA
dc.identifier.citationMullins, J. 1983. Structures of lanthanide-edta complexes. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mullins, Jennifer Mary AB - The structures of six lanthanide-edta complexes were elucidated by X-ray diffraction, so as to ascertain exactly at which point the change from the nine-coordinate [Ln(edta)(H₂O)₃ ]- complex to the eight-coordinate [Ln(edta)(H₂O)₂]-complex occurs. The transition was found to occur at Erbium. The structures of the complexes K⁺[Ln(edta)(H₂O)₃ ].5H₂O for Ln=Praseodymium, Europium, Gadolinium and Holmium were elucidated and found to be isomorphous crystallizing in the orthorhombic space group Fdd1 with Z = 16. In each case , the central metal ion has a coordination mnnber of nine, being bonded to the hexadentate edta ligand and three water molecules. For each structure, anomalous dispersion corrections were applied since Fdd2 is a polar space group. The molecules of water of crystallization were seen to be partially disordered. The structures of the complexes K⁺[Ln(edta)(H₂O)₂ ].4H₂O for Ln =Erbium and Ytterbium were elucidated and found to be isomorphous. A space group problem arose with these two structures as there was a problem of pseudo-synunetry, in that the oolecules were arranged in a P2₁/n pattern, but the motif in fact resembled that of C2/c or Cc. The structures were finally refined in the centrosynnnetric, oonoclinic space group C2/c with Z = 4, but were found to be disordered. In fact, in each case, two independent structures were identified, one 'good' and one 'lesser' structure. A study of the 'good' structure in each case showed that the central metal ion has a coordination number of eight, being bonded to the hexadentate edta ligand and two water molecules. The technique of thermogravirretric analysis was employed in the study of the molecules of water of crystallization. DA - 1983 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1983 T1 - Structures of lanthanide-edta complexes TI - Structures of lanthanide-edta complexes UR - http://hdl.handle.net/11427/22209 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22209
dc.identifier.vancouvercitationMullins JM. Structures of lanthanide-edta complexes. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Chemistry, 1983 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22209en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemistryen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemistryen_ZA
dc.titleStructures of lanthanide-edta complexesen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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