The thermodynamic parameters ((DELTA)G, (DELTA)H & (DELTA)S) of the formation of the europuim monooxalate complex has been determined at 25(DEGREES)C and 0.1M ionic strength (NaClO(,4)) by means of solvent extraction. (DELTA)G values show that the 5-membered oxalate ring is more stable than those of longer chain aliphatic dicarboxylates (malonate, succinate, glutarate or adipate). This effect is reflected in the complexation entropy values, (DELTA)S(,101). / The stability constants for trivalent Eu complexes with benzene polycarboxylates (trimellitate, hemimellitate and pyromellitate) were measured using a solvent extraction system at 25(DEGREES)C and 0.1M ionic strength (NaClO(,4)). The values measured at varying hydrogen ion concentrations show that either protonated species do not form or their formation constants are not significant enought to influence the overall observed conditional constants. The enthalpies for lanthanide hemimellitate and pyromellitate were determined by calorimetric titration. / Solvent extraction studies were conducted for Eu and Am complexes with mellitate at 0.1M and 2.0M (NaClO(,4)). In this case the stability constants for protonated species, MHL and MH(,2)L, were determined. The effective charges calculated from the experimental free energy values of these polycarboxylates indicate a significant charge polarization in the ligand which could be induced through inductive and/or resonance effects. / Source: Dissertation Abstracts International, Volume: 46-06, Section: B, page: 1918. / Thesis (Ph.D.)--The Florida State University, 1985.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75598 |
| Contributors | AL-ANSI, TAJ-EL-DIN YAHYA., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 180 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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