The valence electronic structures of two single-molecule magnets (SMMs), [Fe4(L)2(dpm)6] and [Fe4(L)2(pta)6], (Hdpm = dipivaloylmethane, Hpta = pivaloyltrifluoroacetone, L3- = Ph-C(CH2O)33-), are investigated by means of ultraviolet photoemission spectroscopy (UPS) and ab initio calculations. The experimental UPS spectra of both compounds are analysed and compared with the total density of states (TDOS) computed with the hybrid functional PBE0. The substitution of half of the methyl groups in [Fe4(L)2(dpm)6] with fluorine atoms in [Fe4(L)2(pta)6] unexpectedly affects the spectrum shape in the Fermi region, thus becoming a useful fingerprint of the two SMMs. Moreover, a computational protocol at DFT+U level of theory is assessed on both compounds, giving good agreement with the experimental spectroscopic and magnetic data. The basis for future modelling of the adsorption of Fe4–clusters on surfaces are established.
Valence Electronic Structure of Sublimated Fe4Single-Molecule Magnets: an Experimental and Theoretical Characterization / Silviya Ninova;Valeria Lanzilotto;Luigi Malavolti;Luca Rigamonti;Brunetto Cortigiani;Matteo Mannini;Federico Totti;Roberta Sessoli. - In: JOURNAL OF MATERIALS CHEMISTRY. C. - ISSN 2050-7526. - STAMPA. - 2:(2014), pp. 9599-9608. [10.1039/C4TC01647E]
Valence Electronic Structure of Sublimated Fe4Single-Molecule Magnets: an Experimental and Theoretical Characterization
NINOVA, SILVIYA;LANZILOTTO, VALERIA;MALAVOLTI, LUIGI;CORTIGIANI, BRUNETTO;MANNINI, MATTEO;TOTTI, FEDERICO;SESSOLI, ROBERTA
2014
Abstract
The valence electronic structures of two single-molecule magnets (SMMs), [Fe4(L)2(dpm)6] and [Fe4(L)2(pta)6], (Hdpm = dipivaloylmethane, Hpta = pivaloyltrifluoroacetone, L3- = Ph-C(CH2O)33-), are investigated by means of ultraviolet photoemission spectroscopy (UPS) and ab initio calculations. The experimental UPS spectra of both compounds are analysed and compared with the total density of states (TDOS) computed with the hybrid functional PBE0. The substitution of half of the methyl groups in [Fe4(L)2(dpm)6] with fluorine atoms in [Fe4(L)2(pta)6] unexpectedly affects the spectrum shape in the Fermi region, thus becoming a useful fingerprint of the two SMMs. Moreover, a computational protocol at DFT+U level of theory is assessed on both compounds, giving good agreement with the experimental spectroscopic and magnetic data. The basis for future modelling of the adsorption of Fe4–clusters on surfaces are established.File | Dimensione | Formato | |
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J. Mater. Chem. C, 2014. 2, 9599 - 9608.pdf
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