Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Supramolecular-Enhanced Charge Transfer within Entangled Polyamide Chains as the Origin of the Universal Blue Fluorescence of Polymer Carbon Dots
Δημιουργός/Συγγραφέας:	Vallan, Lorenzo Urriolabeitia, Esteban P. Ruipérez, Fernando Matxain, Jon M. Canton-Vitoria, Ruben [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos Benito, Ana M. Maser, Wolfgang K.
Εκδότης:	American Chemical Society
Ημερομηνία:	2018
Γλώσσα:	Αγγλικά
ISSN:	0002-7863 1520-5126
Περίληψη:	The emission of a bright blue fluorescence is a unique feature common to the vast variety of polymer carbon dots (CDs) prepared from carboxylic acid and amine precursors. However, the difficulty to assign a precise chemical structure to this class of CDs yet hampers the comprehension of their underlying luminescence principle. In this work, we show that highly blue fluorescent model types of CDs can be prepared from citric acid and ethylenediamine through low temperature synthesis routes. Facilitating controlled polycondensation processes, the CDs reveal sizes of 1–1.5 nm formed by a compact network of short polyamide chains of about 10 monomer units. Density functional theory calculations of these model CDs uncover the existence of a spatially separated highest occupied molecular orbital and a lowest unoccupied molecular orbital located at the amide and carboxylic groups, respectively. Photoinduced charge transfer between these groups thus constitutes the origin of the strong blue fluorescence emission. Hydrogen-bond-mediated supramolecular interactions between the polyamide chains enabling a rigid network structure further contribute to the enhancement of the radiative process. Moreover, the photoinduced charge transfer processes in the polyamide network structure easily explain the performance of CDs in applications as revealed in studies on metal ion sensing. These findings thus are of general importance to the further development of polymer CDs with tailored properties as well as for the design of technological applications.
Τίτλος πηγής δημοσίευσης:	Journal of the American Chemical Society
Τόμος/Κεφάλαιο:	140
Τεύχος:	40
Σελίδες:	12862-12869
Θεματική Κατηγορία:	[EL] Χημεία (Γενικά)[EN] Chemistry (General)
Λέξεις-Κλειδιά:	Carbon dots Charge transfer Blue fluorescence Supramolecular interactions
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	Copyright © American Chemical Society
Όροι και προϋποθέσεις δικαιωμάτων:	This is the author’s manuscript and appears in: “J. Am. Chem. Soc. 2018, 140, 40, 12862–12869 Publication Date:September 13, 2018”. The definite version can be found at: https://doi.org/10.1021/jacs.8b06051.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://pubs.acs.org/doi/abs/10.1021/jacs.8b06051
Ηλεκτρονική διεύθυνση περιοδικού (link) :	https://pubs.acs.org/journal/jacsat
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο