Force and conductance spectroscopy of second‐layer tin‐phthalocyanine on Ag(111)

Hauptmann, Nadine; Berndt, Richard

doi:10.1002/pssb.201349210

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…Sn-phthalocyanine (SnPc) can then acquire two conformations on a surface, either with the central metal atom pointing away from (SnPc-up) or toward (SnPc-down) the surface. SnPc on Ag(111) has been extensively studied − and switching between the two conformations has been demonstrated . The position of the Sn atom determines whether the molecule is physisorbed (SnPc-up) or chemisorbed (SnPc-down) .…”

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confidence: 99%

Competing Forces during Contact Formation between a Tip and a Single Molecule

et al. 2015

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Sn-phthalocyanine adsorbs on Ag(111) in a physisorbed or a chemisorbed configuration. Both structures are contacted with the tip of a combined scanning tunneling and atomic force microscope. The tunneling conductances of both configurations exhibit similar exponential variations with the tip-molecule distance. The short-range forces, however, display nontrivial distance dependencies. First-principles calculations reproduce the experimental results. Both attractive and repulsive interactions occur between the tip and different parts of the molecule due to a combination of bond formation and electrostatic interactions with the tip electric dipole. Consequently, deformations occur and the force varies in the resulting unexpected fashion.

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Competing Forces during Contact Formation between a Tip and a Single Molecule

et al. 2015

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“…Nevertheless, the number of studies combining conductance and force measurements on molecules using STM combined with non-contact atomic force microscopy (AFM) is limited. Planar molecules [1][2][3], fullerenes [4][5][6], and carbonmonoxide [7] have been investigated. To implement advanced functions at the nanoscale, it is desirable to rationally design molecules that are more complex [8,9].…”

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High-conductance surface-anchoring of a mechanically flexible platform-based porphyrin complex

et al. 2015

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The conductances of molecular model junctions comprising a triazatriangulenium platform with or without an ethynyl spacer and an upright Zn-porphyrin are probed with a low-temperature scanning probe microscope. The platform alone is found to be highly conductive. The ethynyl-linked Zn-porphyrin moiety reduces the conductance by three orders of magnitude and leads to an unexpected, non-monotonous variation of the force that was measured simultaneously at the tip of the microscope. Density functional theory calculations show that this variation results from an induced tilting of the porphyrin. ExperimentExperiments were performed in a combined STM/AFM in UHV at 5 K with a base pressure of × − 5 10 mbar 11 . The AFM was operated in a non-contact frequency-modulation mode with a tuning fork probe [11]. The free OPEN ACCESS RECEIVED

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“…The extension of the technique towards other physical properties in surface science is pushed continuously. Combined AFM and STM measurements reveal related force and electronic properties [ 9 ], energy dissipation in manipulation processes can be examined via the excitation voltage needed to keep a constant amplitude of the probe oscillation [ 10 – 11 ], pulling forces of atomic or molecular wires can be determined and compared with theoretical predictions [ 12 – 13 ], and local charges within single molecules can be measured [ 14 – 15 ], however, the quantification is still under intense discussion. Chemical reactions are triggered and imaged by the AFM tip [ 16 – 17 ] and of course the technique is not limited to ultrahigh-vacuum (UHV) and low-temperature conditions.…”

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confidence: 99%