Dept. of Biochemistry & Organic Chemistry
Prof. Helena Grennberg
| Helena Grennberg | Address:
SE-751 23 Uppsala Sweden |
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| Prof. in Organic Chemistry | ||
| Tel.: +46 (0)18 471 38 21 | ||
| Fax:+46 (0)18 471 38 18 | ||
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Research interests
Supramolecular and organometallic chemistry
Ongoing research concerns synthesis and studies of host-guest systems, and on studies of reactivity and dynamics in organometallic complexes using NMR spectroscopy (collaboration with doc. Adolf Gogoll, Dept. of Bioch. and Organic Chemistry).
Funding: Vetenskapsrådet
Palladium(II)diacetate, in: "Encyclopedia of Reagents for Organic Synthesis", Paquette, L. (Ed); J. Wiley & Sons 1995; pp 3847-3860 (vol 6).
Purification, derivatisation and evaluations of fullerenes and carbon nanotubes
Carbon nanotubes (CNTs) and their close relatives fullerenes are some of the most interesting molecular structures in the nanoworld. A nanotube can be visualized as a graphene sheet which is rolled up seamlessly to a cylinder with a diameter of only 1-10 nm but as long as one mm. Nanotubes have remarkable electronic and mechanical properties which make them interesting candidates for applications in future nano-scale technologies. Reliable chemical methods for purification and functionalisation are essential for CNTs to reach any of the suggested specific materials applications. Ongoing work in the group involves purification strategies, evaluation of solubilisation methods, derivatisation of C60 and, in collaboration with prof. Ulf Jansson (Dept of Materials chemistry), surface-selective deposition of functionalized nanotubes on solid substrates.
Funding: Vetenskapsrådet, Magn. Bergvalls stiftelse (2007), SSF CARAMEL consortium (2000-2005), Göran Gustafssons stiftelse (2004).
PhD thesis (J. Modin) 9/12 2005:
"Synthesis and evaluation of photoactive pyridine complexes for electron transfer studies and photochemical applications"
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6146 (2006-02-10)
Microwave-Assisted Covalent Sidewall Functionalisation of Multiwalled Carbon nanotubes Junxin Li and Helena Grennberg Chem. Eur. J. 2006, 12, 3869 – 3875 DOI: 10.1002/chem.200501314
Rapid Acid-Mediated Purification of Single-Walled Carbon Nanotubes with Homogenization of Bulk Properties Junxin Li, Khalil Chajara, Jan Lindgren, and Helena Grennberg J. Nanosci. Nanotechnol. 2007, 7, 1525-1529
Dyes and dyads for electron transfer studies and solar cell applications
We have been interested in two groups of dyes which absorb different parts of the solar spectrum. Ruthenium bipyridyl complexes and phthalocyanines has been studied in solar cells based on nanostructured semiconducting oxides (TiO2, ZnO).
Of current interest is the fundamentals of electron/energy transfer in donor-acceptor assemblies (dyads), with ongoing studies in collaboration with prof. L. Hammarström on dyads consisting of a ruthenium-based donor part covalently connected to a C60 acceptor.
PhD thesis (J. Modin ) 9/12 2005:
"Synthesis and evaluation of photoactive pyridine complexes for electron transfer studies and photochemical applications".
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6146 (2006-02-10)
PhD thesis (V. Aranyos) 1/11 2000:
"Dyes and their adsorption onto nanocrystalline TiO2 electrodes".