PhD ceremony: Ms. H. Tchouka, 14.30 uur, Aula Academiegebouw, Broerstraat 5, Groningen
Dissertation: Magnetic and spectroscopic studies of iron and manganese complexes: from molecular materials to catalysis
Promotor(s): prof. B.L. Feringa
Faculty: Mathematics and Natural Sciences
Prussian Blue (PB) (Fe4[Fe(CN)6]3.14H2O) was discovered in the 18th century and used as a dye. Recently, the chemistry of cyano complexes such as PB and its analogues (PBAs) has attracted renewed interest. Their physical and chemical properties e.g., dimensionality, color, magnetism, electron transfer are useful in a wide range of materials applications, such as magneto-optical devices or as gas storage materials. One of the main challenges in applications in magnetic memory has been to synthesize of PBAs with a Curie temperature close to room temperature. Their properties can be tuned by parameters such as the defects in their structure, the alkali metal or the transition metal used during the synthesis, however, perfect control of these parameters has not yet been established. Most reported PBAs are synthesized from the reaction of a mononuclear hexacyano complex anion ([M(CN)6]n-) with a transition metal cation (M’p+). This thesis shows that the properties of the complexes can be tuned by substituting one of the cyano ligands with an imidazole. The imidazole complex ([FeIII(CN)5im]2-)is prepared from the ethylene diamine complex ([FeII(CN)5im]3-); a reaction which itself raises new prospects of C-C bond cleavage, which could be of relevance in catalysis. The use of [FeIII(CN)5im]2-as building block leads to a new series of PBAs of the type M[Fe(CN)5im].xSolvent (M is Mn2+, Co2+ of Zn2+). Their crystalline forms are either two or three dimensional networks, and the presence of the imidazole ligand improves the magnetic behavior of the system by increasing the Curie temperature.
Aan het einde van de zomer komen er naast veel Nederlandse studenten ook internationale studenten naar Groningen om voor kortere of langere tijd te studeren aan de Hanzehogeschool Groningen (HG) of de Rijksuniversiteit Groningen (RUG). Vanwege de...
NWA Idea Generator project for Kottapalli to develop low-cost sensorized shoes for patients to monitor gait and avoid fall conditions through a biofeedback voice alert.
Ymkje Stienstra (UMCG), Joram Tarusaria and Ajay Kottapalli receive an NWA Idea Generator Grant .