Change of the Magnetic Coupling of a Metal–Organic Complex with the Substrate by a Stepwise Ligand Reaction

Heinrich, Benjamin; Ahmadi, Gelavizh; Müller, Valentin; Braun, Lukas; Pascual, José; Franke, Katharina J.

doi:10.1021/nl402575c

Cited by 77 publications

(112 citation statements)

References 30 publications

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“…Substrate-catalyzed ligand transformation of FeOEP to FeTBP was also reported to change the electronic coupling to the substrate and the magnetic fingerprint, indicating increased coupling of the spin at the Fe center with the substrate electrons [431].…”

Section: Adsorption On Coinage Metal Substratesmentioning

confidence: 99%

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Surface chemistry of porphyrins and phthalocyanines

Gottfried

2015

Surface Science Reports

569

586

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Section: Adsorption On Coinage Metal Substratesmentioning

confidence: 99%

“…The structural change was accompanied by a modification of the adsorbate-substrate interaction (cf. Section 5.2) [431].…”

Section: Reactive Structural Adaptationmentioning

confidence: 99%

Surface chemistry of porphyrins and phthalocyanines

Gottfried

2015

Surface Science Reports

569

586

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“…In this way we treat the spin dimer as an equilibrium system, i.e., conserved number of particles for which the occupations of the states is given by the Gibbs distribution, which is influenced by the tunneling current that flows through the molecular complex. This set-up pertains to, e.g., MPc and MP where M denotes a magnetic transition metal atom, e.g., Cr, Mn, Fe, Co, Ni, Cu, and can be realized in, for example, mechanically controlled break-junctions [7] and scanning tunneling microscope [34,35]. Having such systems in mind, also justifies that we neglect spin-orbit coupling in the molecular orbitals, since such coupling essentially pertains to the d-electrons constituting the paramagnetic moment, and also that we consider the molecular levels in a single particle form, relevant for s-and p-electrons.…”

mentioning

confidence: 99%

Voltage-Induced Switching Dynamics of a Coupled Spin Pair in a Molecular Junction

et al. 2016

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Molecular spintronics is made possible by the coupling between electronic configuration and magnetic polarization of the molecules. For control and application of the individual molecular states it is necessary to both read and write their spin states. Conventionally, this is achieved by means of external magnetic fields or ferromagnetic contacts, which may change the intentional spin state and may present additional challenges when downsizing devices. Here, we predict that coupling magnetic molecules together opens up possibilities for all electrical control of both the molecular spin states as well as the current flow through the system. Tuning between the regimes of ferromagnetic and anti-ferromagnetic exchange interaction, the current can be, at least, an order of magnitude enhanced or reduced. The effect is susceptible to the tunnel coupling and molecular level alignment which can be used to achieve current rectification. Molecular spintronics is a field which aims to merge the flexibility of synthetic design of molecular compounds with novel functionalities offered by magnetic properties in conjunction with electronics circuits [1]. Magnetically active molecules have been used to demonstrate spin valve effect using external magnetic fields [2], stochastic switching between high and low conductive states by transitions between spin singlet and triplet ground states [3][4][5][6], controlled transport properties via paramagnetic atoms [7], as well as their potential for quantum based computation [8][9][10][11][12][13]. Arrays of magnetic molecules inserted between conducting leads, moreover, provide an important forum to investigate fundamental magnetic properties of finite one-dimensional Ising or Heisenberg chains [14][15][16] as well as potential for electrical and thermal control of the magnetic state. Certain classes of molecules, e.g., metal-phthalocyanines (MPc) and metal-porhyrins (MP) present chemical stability with specific optical and electrical properties make them highly appreciated for technological applications including organic field effect transistors [17,18], light emitting devices [19,20] and photovoltaic cells [21], and for fundamental studies [7,[22][23][24][25][26][27].While incorporation of magnetic elements in molecular compounds can have a significant effect on the overall molecular transport properties [7], the main established route to spintronics manipulations entails external magnetic fields [2] or ferromagnetic electrodes [28,29], often exploiting spin transfer torques from spin-polarized scattering [30] or Coulomb interaction [31]. Here, we propose a different route to molecular spintronics based on voltage induced control of magnetic interactions that allows for all electrical control of the transport properties. Deriving from local exchange interactions between the localized spin moments and the electrons in paramagnetic molecules, an indirect effective spinspin interaction is generated between the molecular spin moments through the electron tunneling between the molecules [32...

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“…A recent scanning tunneling microscopy study investigated the kinetics of the transformation of 2,3,7,8,12,13,17,18-octaethylporphyrin Fe(III) chloride (FeOEP-Cl) towards iron-II-tetra-benzo-porphyrin (FeTBP) on a Cu(111) surface [40,53]. The reaction proceeds via a dechlorination step and dehydrogenation of the molecule's eight terminal ethyl groups.…”

Section: Imaging and Counting Intermediatesmentioning

confidence: 99%

Mechanistic Insights into Surface-Supported Chemical Reactions

Riss

2018

On-Surface Synthesis II

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Its excellent spatial resolution makes scanning probe microscopy a capable method to investigate chemical reactions at the single-molecule level and obtain fascinating and unprecedented insights into the mechanisms of chemical transformations. Particularly exciting are recent advances in atomic force microscopy that allow bond-resolved imaging and thus make the chemical identification of organic molecular reaction intermediates and products possible. In this chapter we will give an overview about recent fundamental research on reaction mechanisms and kinetics of surface-supported reactions by scanning probe microscopy. Particular emphasis will be placed on the stabilization and statistical analysis of intermediates, which provides fundamental understanding of the microscopic driving forces of complex chemical transformations of organic molecules.

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Change of the Magnetic Coupling of a Metal–Organic Complex with the Substrate by a Stepwise Ligand Reaction

Cited by 77 publications

References 30 publications

Surface chemistry of porphyrins and phthalocyanines

Surface chemistry of porphyrins and phthalocyanines

Voltage-Induced Switching Dynamics of a Coupled Spin Pair in a Molecular Junction

Mechanistic Insights into Surface-Supported Chemical Reactions

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