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2017-10-04

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/118837

Molecules Designed to Contain Two Weakly Coupled Spins with a Photoswitchable Spacer

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https://doi.org/10.1002/chem.201702171

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Controlling the charges and spins of molecules lies at the heart of spintronics. A photoswitchable molecule consisting of two independent spins separated by a photo- switchable moiety was designed in the form of new ligand H4L, which features a dithienylethene photochromic unit and two lateral coordinating moieties, and yields molecules with [MM···MM] topology. Compounds [M4L2(py)6] (M = Cu, 1; Co, 2; Ni, 3; Zn, 4) were prepared and studied by single-crys- tal X-ray diffraction (SCXRD). Different metal centers can be selectively distributed among the two chemically distinct sites of the ligand, and this enables the preparation of many double-spin systems. Heterometallic [MM'···M'M] analogues with formulas [Cu2Ni2L2(py)6] (5), [Co2Ni2L2(py)6] (6), [Co2Cu2L2(py)6] (7), [Cu2Zn2L2(py)6] (8), and [Ni2Zn2L2(py)6] (9) were prepared and analyzed by SCXRD. Their composition was established unambiguously. All complexes exhibit two weakly interacting [MM'] moieties, some of which embody two-level quantum systems. Compounds 5 and 8 each ex- hibit a pair of weakly coupled S = 1=2 spins that show quan- tum coherence in pulsed Q-band EPR spectroscopy, as re- quired for quantum computing, with good phase memory times (TM = 3.59 and 6.03 ms at 7 K). Reversible photoswitch- ing of all the molecules was confirmed in solution. DFT cal- culations on 5 indicate that the interaction between the two spins of the molecule can be switched on and off on photo- cyclization.

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Compostos de coordinació, Fotoquímica orgànica, Propietats magnètiques

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Coordination compounds, Organic photochemistry, Magnetic properties

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Articles publicats en revistes (Química Inorgànica i Orgànica)

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SALINAS UBER, Jorge, ESTRADER I BOFARULL, Marta, GARCÍA GÓMEZ, Jordi, LLOYD-WILLIAMS, Paul, SADURNÍ, Anna, DENGLER, Dominik, VAN SLAGEREN, Joris, CHILTON, Nicholas f., ROUBEAU, Olivier, TEAT, Simon j., RIBAS ARIÑO, Jordi, AROMÍ BEDMAR, Guillem. Molecules Designed to Contain Two Weakly Coupled Spins with a Photoswitchable Spacer. _Chemistry-A European Journal_. 2017. Vol. 23, núm. 55, pàgs. 13648-13659. [consulta: 7 de febrer de 2026]. ISSN: 0947-6539. [Disponible a: https://hdl.handle.net/2445/118837]

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