Complexation and Electronic Communication between Corannulene-Based Buckybowls and a Curved Truxene-TTF Donor



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Gallego, María and Calbo, Joaquín and Krick Calderón, Rafael M. and Pla, Paula and Hsieh, Ya-Chu and Pérez, Emilio M. and Wu, Yao-Ting and Ortí, Enrique and Guldi, Dirk M. and Martín, Nazario (2017) Complexation and Electronic Communication between Corannulene-Based Buckybowls and a Curved Truxene-TTF Donor. Chemistry : a european journal, 23 . pp. 1-9. ISSN 1521-3765 (Online)

[thumbnail of Chem. Eur. J. 2017, 23, in press DOI 10.1002-chem.201604921.pdf]

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Abstract: The association behavior of an electron-donating, bowl-shaped, truxene-based tetrathiafulvalene (truxTTF) with two corannulene-based fullerene fragments, C32H12 and C38H14, is investigated in several solvents. Formation of 1:1 complexes is followed by absorption titrations and complemented by density functional theory (DFT) calculations. The binding constants are in the range logKa=2.9–3.5. DFT calculations reveal that the most stable arrangement is the conformation in which the 1,3-dithiole ring of truxTTF is placed inside the concave cavity of the corannulene derivative. This arrangement is confirmed experimentally by NMR measurements, and implies that a combination of p–p and CH–p interactions is the driving force for association. Timedependent DFT calculations reproduce the experimental UV/Vis titrations and provide a detailed understanding of the spectral changes observed. Femtosecond transient absorption studies reveal the processes occurring after photoexcitation of either C32H12 or C38H14 and their supramolecular associates with truxTTF. In the case of truxTTF·C38H14, photoexcitation yields the charge-separated state truxTTFC +·C38H14C with a lifetime of approximately 160 ps.

Item Type:Article
Uncontrolled Keywords:association constants · buckybowls · donor– acceptor systems · photoinduced charge transfer · supramolecular chemistry
Subjects:Sciences > Chemistry > Chemistry, Organic
ID Code:41683
Deposited On:07 Mar 2017 11:39
Last Modified:01 Mar 2018 00:01

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