Synthesis of open shell organic molecules for magnetic materials applications and investigations

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Synthesis of open shell organic molecules for magnetic materials applications and investigations

Paul R. Serwinski-2003-01-01-ScholarWorks@UMassAmherst (University of Massachusetts Amherst)

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TL;DRAbstract

A variety of molecules were investigated to help determine structure-property relationships governing the limits of unpaired electron delocalization and interaction. Nitreno-radicals were synthesized and examined by ESR. Connectivites of nitrene groups were correlated to ZFS :D/hc: and :E/ hc: values. Meta-connected quartet state systems showed larger :D/hc: compared to para-connectivity. Calculations did not show more delocalization in either connectivity. Prepared quartets were studied by ESR Curie analysis over 4–70 K. Nitrosonium perchlorate complexes of azidophenyl nitronyl nitroxides were studied by X-ray crystallography and found to be more planar than their radical precursors. Magnetic susceptibility measurements showed little response, confirming oxidation to cation. Prepared para-connected rigid dinitrenes were studied by ESR and Curie analysis. 1,4-Bis-(nitrenophenyl)-1,3-butadiyne (29 ) showed an excited-state triplet biradical spectrum, and is presumably a ground-state sin

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A variety of molecules were investigated to help determine structure-property relationships governing the limits of unpaired electron delocalization and interaction. Nitreno-radicals were synthesized and examined by ESR. Connectivites of nitrene groups were correlated to ZFS :D/hc: and :E/ hc: values. Meta-connected quartet state systems showed larger :D/hc: compared to para-connectivity. Calculations did not show more delocalization in either connectivity. Prepared quartets were studied by ESR Curie analysis over 4–70 K. Nitrosonium perchlorate complexes of azidophenyl nitronyl nitroxides were studied by X-ray crystallography and found to be more planar than their radical precursors. Magnetic susceptibility measurements showed little response, confirming oxidation to cation. Prepared para-connected rigid dinitrenes were studied by ESR and Curie analysis. 1,4-Bis-(nitrenophenyl)-1,3-butadiyne (29 ) showed an excited-state triplet biradical spectrum, and is presumably a ground-state sin

Keywords

Organic moleculesMaterials scienceShell (structure)NanotechnologyMoleculeChemistryComposite materialOrganic chemistry

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