Kittilstved, Kevin

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Assistant Professor, Department of Chemistry
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Multifunctional Inorganic Materials Chemistry
Our research is focused on understanding and manipulating the electronic structures of transition metal ions in inorganic hosts for a wide range of applications such as solar energy conversion, photochemical water splitting and spin-based electronics. Many of the materials that we are interested in studying possess the physical properties that make them attractive candidates for multiple applications and are therefore referred to as multifunctional inorganic materials. We are developing synthetic methodologies to prepare novel colloidal nanocrystals of transition metal doped materials that can be integrated into nanostructured devices using standard solution processing techniques. To correlate the function of these multifunctional inorganic materials with the electronic structures of the transition metal ion we employ sophisticated characterization techniques including high-resolution electronic absorption, luminescence and magneto-optical spectroscopies.

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  • Publication
    Persistent radical anion polymers based on naphthalenediimide and a vinylene spacer
    (2018-01-01) Debnath, Sashi; Boyle, Connor J.; Zhou, Dongming; Wong, Bryan M.; Kittilstved, Kevin R.; Venkataraman, Dhandapani
    Persistent n-doped conjugated polymers were achieved by doping the electron accepting PDNDIV and PFNDIVpolymers with ionic (TBACN) or neutral (TDAE) dopants. The great electron affinities, as indicated by the low LUMO levels of PDNDIV (−4.09 eV) and PFNDIV (−4.27 eV), facilitated the chemical reduction from either TBACN or TDAE. The low-lying LUMOs of the neutral polymers PDNDIV and PFNDIV were achieved by incorporation of vinylene spacers between the electron poor NDI units to increase the conjugation length without the use of an electron donor, and this was lowered further by an electron-withdrawing fluorinated N-substituent on the NDI moiety. The polymer radical anions were found to persist for several days under ambient conditions by EPR spectroscopy. A distinguishing and noteworthy feature of these polymers is that they can be consecutively reduced by up to four electrons in acetonitrile. Conductivity measurements demonstrate the prospective impact of PDNDIV and PFNDIV for organic electronics.