Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Host-Guest Interactions in the C59N•⊂[10]CPP Supramolecular Radical
Δημιουργός/Συγγραφέας:	Tanuma, Yuri Anézo, Bastien Knaflič, Tilen Volkmann, Jannis Wegner, Hermann A Sideri, Ioanna K. [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos Ewels, Christopher P Arčon, Denis
Ημερομηνία:	2025-05-15
Γλώσσα:	Αγγλικά
ISSN:	1932-7447
DOI:	10.1021/acs.jpcc.4c07474
Άλλο:	40395714
Περίληψη:	A remarkable stability of a supramolecular radical comprising an azafullerene (C59N•) radical sterically protected by a [10]cycloparaphenylene ([10]CPP) nanoring, C59N•⊂[10]CPP, has recently been observed by various experimental probes. In order to investigate the host-guest interaction in these supramolecular complexes, we carried out electron paramagnetic resonance (EPR) measurements, theoretically supported by density functional theory (DFT) calculations. The continuous wave (CW) EPR spectrum shows the presence of two active spin components: C59N•⊂[10]CPP monomers that can in certain cases polymerize into oligomeric radicals. Two- and three-pulse electron spin echo envelope modulation (ESEEM) measurements allow for determination of experimental hyperfine coupling constants for 13C and 1H atoms and also show the strong coupling to the 14N atom adjacent to the radical C of the azafullerene. These experimental hyperfine coupling constants reasonably agree with those calculated for the DFT optimized supramolecular structures. The results are consistent with a small spin delocalization from the guest (C59N•) to the host ([10]CPP), thereby explaining weak but non-negligible interaction between them. Our study demonstrates that ESEEM experiments in alliance with DFT computations can offer valuable insights into the radical host-guest structures.
Τίτλος πηγής δημοσίευσης:	The journal of physical chemistry. C, Nanomaterials and interfaces
Τόμος/Κεφάλαιο:	129
Τεύχος:	19
Θεματική Κατηγορία:	[EL] Νανοτεχνολογία[EN] Nanotechnology [EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	Carbon Chemical structure Electron paramagnetic resonance spectroscopy Energy levels Quantum mechanics
Κάτοχος πνευματικών δικαιωμάτων:	© 2025 The Authors. Published by American Chemical Society.
Όροι και προϋποθέσεις δικαιωμάτων:	This publication is licensed under CC-BY 4.0.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1021/acs.jpcc.4c07474
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο