Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	A new approach for the photosynthetic antenna-reaction center complex with a model organized around an s-triazine linker
Δημιουργός/Συγγραφέας:	Kuhri S. Charalambidis G. Angaridis P.A. Lazarides T. Pagona G. [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos Coutsolelos A.G. Guldi D.M.
Ημερομηνία:	2014
Γλώσσα:	Αγγλικά
ISSN:	0947-6539
DOI:	10.1002/chem.201302632
Άλλο:	PubMed ID: 24403209
Περίληψη:	Two new artificial mimics of the photosynthetic antenna-reaction center complex have been designed and synthesized (BDP-H2P-C60 and BDP-ZnP-C60). The resulting electron-donor/acceptor conjugates contain a porphyrin (either in its free-base form (H2P) or as Zn-metalated complex (ZnP)), a boron dipyrrin (BDP), and a fulleropyrrolidine possessing, as substituent of the pyrrolidine nitrogen, an ethylene glycol chain terminating in an amino group C60-X-NH2 (X=spacer). In both cases, the three different components were connected by s-triazine through stepwise substitution reactions of cyanuric chloride. In addition to the facile synthesis, the star-type arrangement of the three photo- and redox-active components around the central s-triazine unit permits direct interaction between one another, in contrast to reported examples in which the three components are arranged in a linear fashion. The energy- and electron-transfer properties of the resulting electron-donor/acceptor conjugates were investigated by using UV/Vis absorption and emission spectroscopy, cyclic voltammetry, and femtosecond transient absorption spectroscopy. Comparison of the absorption spectra and cyclic voltammograms of BDP-H2P-C60 and BDP-ZnP-C 60 with those of BDP-H2P, BDP-ZnP and BDP-C60, which were used as references, showed that the spectroscopic and electrochemical properties of the individual constituents are basically retained, although some appreciable shifts in terms of absorption indicate some interactions in the ground state. Fluorescence lifetime measurements and transient absorption experiments helped to elucidate the antenna function of BDP, which upon selective excitation undergoes a rapid and efficient energy transfer from BDP to H2P or ZnP. This is then followed by an electron transfer to C 60, yielding the formation of the singlet charge-separated states, namely BDP-H2P.+-C60.- and BDP-ZnP.+-C60.-. As such, the sequence of energy transfer and electron transfer in the present models mimics the events of natural photosynthesis.
Τίτλος πηγής δημοσίευσης:	Chemistry - A European Journal
Τόμος/Κεφάλαιο:	20
Τεύχος:	7
Σελίδες:	2049-2057
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	cyclic voltammetry electron transfer energy transfer photosynthesis synthetic methods
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο