Single-molecule magnets: Jahn–Teller isomerism and the origin of two magnetization relaxation processes in Mn12 complexes

Aubin, Sheila M. J.; Sun, Zheng; Eppley, Hilary J.; Rumberger, E. M.; Guzei, Ilia A.; Folting, Kirsten; Gantzel, Peter; Rheingold, Arnold L.; Christou, George; Hendrickson, David N.

doi:10.1016/s0277-5387(01)00585-x

Cited by 44 publications

(33 citation statements)

References 46 publications

(48 reference statements)

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“…4a,b), attributable to the presence of two slightly different Mn 12 Ac species, with different values of zero-field splitting parameter, D. The lower-temperature maximum corresponds to a fast-relaxing species in which Jahn-Teller elongation axis of one of the Mn 3 + centres has been tilted by 90° compared with the normal Mn 12 Ac molecule (slow-relaxing species) 27 . For Mn 12 Ac@GMWNT (1), the fraction of fast-relaxing species, which is determined from the intensity of the low-temperature peak, is ~20% compared with 7% for the control sample Mn 12 Ac (2) ( Supplementary Fig.…”

Section: Magnetic Behaviour Of Smm In Nanotubesmentioning

confidence: 99%

Encapsulation of single-molecule magnets in carbon nanotubes

et al. 2011

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next-generation electronic, photonic or spintronic devices will be based on nanoscale functional units, such as quantum dots, isolated spin centres or single-molecule magnets. The key challenge is the coupling of the nanoscale units to the macroscopic world, which is essential for read and write purposes. Carbon nanotubes with one macroscopic and two nanoscopic dimensions provide an excellent means to achieve this coupling. Although the dimensions of nanotube internal cavities are suitable for hosting a wide range of different molecules, to our knowledge, no examples of molecular magnets inserted in nanotubes have been reported to date. Here we report the successful encapsulation of single-molecule magnets in carbon nanotubes, yielding a new type of hybrid nanostructure that combines all the key single-molecule magnet properties of the guest molecules with the functional properties of the host nanotube. The findings may pave the way to the construction of spintronic or ultrahigh-density magnetic data storage devices.

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Section: Magnetic Behaviour Of Smm In Nanotubesmentioning

confidence: 99%

Encapsulation of single-molecule magnets in carbon nanotubes

et al. 2011

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“…The magnetic core is protected by an organic shell that may be altered by conventional wet chemistry techniques such as ligand exchange [12][13][14] and direct synthesis from the appropriate carboxylate reagents 15 . Mn 12 (acetate) 16 exhibits magnetic properties, such as hysteresis cycles, magnetic anisotropy originating from a purely molecular basis 10,16 , quantum magnetic tunnelling effects 17,18 and also has potential for molecular information storage devices 11,19 .…”

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confidence: 99%

Self-assembled aggregates formed by single-molecule magnets on a gold surface

et al. 2010

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The spontaneous ordering of molecules into two-dimensional self-assembled arrays is commonly stabilized by directional intermolecular interactions that may be promoted by the addition of specific chemical side groups to a molecule. In this paper, we show that self-assembly may also be driven by anisotropic interactions that arise from the three-dimensional shape of a complex molecule. We study the molecule mn 12 o 12 (o 2 CCH 3 ) 16 (H 2 o) 4 (mn 12 (acetate) 16 ), which is transferred from solution onto a Au(111) substrate held in ultrahigh vacuum using electrospray deposition (uHV-EsD). The deposited mn 12 (acetate) 16 molecules form filamentary aggregates because of the anisotropic nature of the molecule-molecule and molecule-substrate interactions, as confirmed by molecular dynamics calculations. The fragile mn 12 o 12 core of the mn 12 (acetate) 16 molecule is compatible with the uHV-EsD process, which we demonstrate using near-edge X-ray adsorption fine-structure spectroscopy. uHV-EsD of mn 12 (acetate) 16 onto a surface that has been prepatterned with a hydrogen-bonded supramolecular network provides additional control of lateral organization.

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“…These values are typical of HT and LT JT isomers. 4,5 Magnetization vs. DC field scans were performed on aligned single crystals of 3a and 3b using a micro-SQUID apparatus, and the resulting hysteresis loops are shown in Fig. 3.…”

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confidence: 99%