TEMPO-Labeled Viologen Dendrimers: Synthesis, Characterization, and Preliminary Distance Measurements
DC Element | Wert | Sprache |
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dc.contributor.author | Kathiresan, Murugavel | |
dc.contributor.author | Steinhoff, Heinz-Juergen | |
dc.contributor.author | Walder, Lorenz | |
dc.date.accessioned | 2021-12-23T16:06:30Z | - |
dc.date.available | 2021-12-23T16:06:30Z | - |
dc.date.issued | 2017 | |
dc.identifier.issn | 10221352 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/7436 | - |
dc.description.abstract | Viologen dendrimers (G(0)* to G(2)*) bearing (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) spin labels are successfully synthesized via a divergent approach. 4-amino TEMPO is successfully grafted onto the periphery of the dendrimer moieties using Zincke reaction under dark conditions. The final products are characterized by cyclic voltammetry and the spin-label efficiencies are characterized by electron paramagnetic resonance (EPR) measurements. Cyclic voltammetric studies show the coexistence of both viologen as well as TEMPO electroactive subunits, and evidence for the intramolecular electrocatalytic reduction of TEMPO by viologen subunit is presented. EPR measurements show moderate to good spin-label efficiencies (72-85%), but the spin-labeled samples are not stable in the presence of air and light. The measured spin-label efficiency decreases with increasing dendrimer generation. Double electron resonance measurements provide interspin distances for zeroth generation G(0)* dendrimers. MM+ calculations perform using Hyperchem show an averaged single spin distance (2.34 nm) for G(0)* dendrimers and a more complex scenario of several possible interspin distances in the case of G(1)* and G(2)* dendrimers. | |
dc.description.sponsorship | DFGGerman Research Foundation (DFG)European Commission; University of Osnabrueck; M.K. thanks Graduate College 612 funded by the DFG and University of Osnabrueck for financial assistance. Dr. Christian Rickert is gratefully acknowledged for the EPR measurements and for proof-reading the manuscript. Simona Webersinn is gratefully acknowledged for recording the NMR spectrum of the spin-labeled dendrimers. | |
dc.language.iso | en | |
dc.publisher | WILEY-V C H VERLAG GMBH | |
dc.relation.ispartof | MACROMOLECULAR CHEMISTRY AND PHYSICS | |
dc.subject | 5 GENERATIONS | |
dc.subject | COMPLEXATION | |
dc.subject | dendrimers | |
dc.subject | distance measurements | |
dc.subject | DNA | |
dc.subject | EPR | |
dc.subject | EPR spectroscopy | |
dc.subject | FUNCTIONALIZED DENDRIMERS | |
dc.subject | NANOMETER-DISTANCE | |
dc.subject | Polymer Science | |
dc.subject | RADICALS | |
dc.subject | REDOX-GRADIENT | |
dc.subject | SPIN LABELS | |
dc.subject | STARBURST DENDRIMERS | |
dc.subject | zincke reaction | |
dc.title | TEMPO-Labeled Viologen Dendrimers: Synthesis, Characterization, and Preliminary Distance Measurements | |
dc.type | journal article | |
dc.identifier.doi | 10.1002/macp.201700142 | |
dc.identifier.isi | ISI:000412282500007 | |
dc.description.volume | 218 | |
dc.description.issue | 19 | |
dc.contributor.orcid | 0000-0002-1208-5879 | |
dc.contributor.orcid | 0000-0002-5888-0157 | |
dc.contributor.orcid | 0000-0002-5497-034X | |
dc.contributor.researcherid | C-3889-2019 | |
dc.contributor.researcherid | H-3791-2014 | |
dc.identifier.eissn | 15213935 | |
dc.publisher.place | POSTFACH 101161, 69451 WEINHEIM, GERMANY | |
dcterms.isPartOf.abbreviation | Macromol. Chem. Phys. | |
crisitem.author.dept | FB 04 - Physik | - |
crisitem.author.dept | Institut für Chemie neuer Materialien | - |
crisitem.author.deptid | fb04 | - |
crisitem.author.deptid | institute11 | - |
crisitem.author.orcid | 0000-0002-5497-034X | - |
crisitem.author.parentorg | Universität Osnabrück | - |
crisitem.author.parentorg | FB 05 - Biologie/Chemie | - |
crisitem.author.grandparentorg | Universität Osnabrück | - |
crisitem.author.netid | StHe633 | - |
crisitem.author.netid | WaLo966 | - |
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