Multi-responsive cellulose nanocrystal–rhodamine conjugates: an advanced structure study by solid-state dynamic nuclear polarization (DNP) NMR
2014 | journal article. A publication with affiliation to the University of Göttingen.
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Multi-responsive cellulose nanocrystal–rhodamine conjugates: an advanced structure study by solid-state dynamic nuclear polarization (DNP) NMR
Liu, Z.; Li, W. ; Plog, A.; Xu, Y.; Buntkowsky, G.; Gutmann, T. & Zhang, K. (2014)
Physical Chemistry, Chemical Physics, 16(47). DOI: https://doi.org/10.1039/c4cp04096a
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Details
- Authors
- Liu, Zhao; Li, Weixing ; Plog, Andreas; Xu, Yeping; Buntkowsky, Gerd; Gutmann, Torsten; Zhang, Kai
- Abstract
- Multi-stimuli responsive materials based on cellulose nanocrystals (CNCs), especially using non-conventional stimuli including light, still need more explorations, to fulfill the requirements of complicated application environments. The structure determination of functional groups on the CNC surface constitutes a significant challenge, partially due to their low amounts. In this study, rhodamine spiroamide groups are immobilized onto the surface of CNCs leading to a hybrid compound being responsive to pH-values, heat and UV light. After the treatment with external stimuli, the fluorescent and correlated optical color change can be induced, which refers to a ring opening and closing process. Amine and amide groups in rhodamine spiroamide play the critical role in this switching process. Solid-state NMR spectroscopy coupled with sensitivity-enhanced dynamic nuclear polarization (DNP) was used to measure 13C and 15N in natural abundance, allowing the determination of structural changes during the switching process. It is shown that a temporary bond through an electrostatic interaction could be formed within the confined environment on the CNC surface during the heat treatment. The carboxyl groups on the CNC surface play a pivotal role in stabilizing the open status of rhodamine spiroamide groups.
- Issue Date
- 2014
- Journal
- Physical Chemistry, Chemical Physics
- Organization
- Fakultät für Forstwissenschaften und Waldökologie ; Burckhardt-Institut ; Abteilung Holztechnologie und Holzwerkstoffe ; Juniorprofessur Holztechnologie und Holzchemie
- Language
- English