Hao Tang

Centre National de la Recherche Scientifique

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Christian Joachim

Centre National de la Recherche Scientifique

Jie Li

Peking University

Richard Berndt

Kiel University

Yongfeng Wang

Peking University

Jing Liu

Peking University

Mingjun Zhong

Peking University

Sébastien Gauthier

Centre National de la Recherche Scientifique

James K. Gimzewski

University of California, Los Angeles

Christophe Coudret

Université Toulouse III - Paul Sabatier

Yajie Zhang

Peking University

Cooperative Institutions

Centre National de la Recherche Scientifique

Peking University

Centre d’Élaboration de Matériaux et d’Études Structurales

Université de Toulouse

Université Toulouse III - Paul Sabatier

Beijing National Laboratory for Molecular Sciences

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Centre de Nanosciences et de Nanotechnologies

University of Basel

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Conductance of a single molecule C60-SnPc heterojunction

Chinese Chemical Letters (2021)

Yifan Wang Mingjun Zhong Jie Li Hao Tang Richard Berndt

10.1016/j.cclet.2021.05.060

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Citations (15)

Deformation of a “Rigid” Molecule in Self-Assembled Nanostructures

The Journal of Physical Chemistry B (2005)

Hao Tang Christophe Coudret Thomas Maroutian Richard Berndt

A simple spirobifluorene molecule with pseudotetrahedral structure was investigated for its supposed conformational resilience upon adsorption. Through deposition at room temperature of this molecule on a Cu(111) surface and subsequent observation at 5 K with an ultrahigh vacuum scanning tunneling microscope, this "rigidity" upon physisorption is confirmed. However, an unexpected chemisorbed state was also found with the molecules arranged in trimers. The unique coexistence of physisorbed and chemisorbed states on the same substrate is thus demonstrated at the early stage of self-assembly.

Physisorption

Rigidity (electromagnetism)

Structural rigidity

10.1021/jp0539728

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Citations (2)

Stepwise on-surface dissymmetric reaction to construct binodal organometallic network

Nature Communications (2019)

Jing Liu Qiwei Chen Kang Cai Jie Li Yaru Li

Abstract Dissymmetric reactions, which enable differentiated functionalization of equivalent sites within one molecule, have many potential applications in synthetic chemistry and materials science, but they are very challenging to achieve. Here, the dissymmetric reaction of 1,4-dibromo-2,5-diethynylbenzene (2Br-DEB) on Ag(111) is realized by using a stepwise activation strategy, leading to an ordered two-dimensional organometallic network containing both alkynyl–silver–alkynyl and alkynyl–silver–phenyl nodes. Scanning tunneling microscopy and density functional theory calculations are employed to explore the stepwise conversion of 2Br-DEB, which starts from the H-passivation of one Br-substituted site at 300 K in accompaniment with an intermolecular reaction to form one-dimensional organometallic chains containing alkynyl–silver–alkynyl nodes. Afterwards, the other equivalent Br-substituted site undergoes metalation reaction at 320–450 K, resulting in transformation of the chains into the binodal networks. These findings exemplify the achievement of the dissymmetric reaction and its practical application for controlled fabrications of complicated yet ordered nanostructures on a surface.

Binodal

Organometallic Chemistry

Metalation

Passivation

10.1038/s41467-019-10522-4

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Citations (37)

STM observation of the dissociation of a chromium tris-diketonato complex on Cu(100)

Chemical Physics Letters (2002)

S.E. Grillo Hao Tang Christophe Coudret Sébastien Gauthier

10.1016/s0009-2614(02)00258-0

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Citations (8)

Direct Determination of the Energy Required to Operate a Single Molecule Switch

Physical Review Letters (2003)

Ch. Loppacher Martin Guggisberg Olivier Pfeiffer Ernst Meyer M. Bammerlin

Using a noncontact atomic-force and scanning-tunneling microscope in ultrahigh vacuum, we have measured the switching energy of a single molecule switch based on the rotation of a di-butyl-phenyl leg in a Cu-tetra-3,5 di-tertiary-butyl-phenyl porphyrin. The mechanics and intramolecular conformation of the switched leg is controlled by the tip apex of the noncontact atomic-force microscope. The comparison between experimental and calculated force curves shows that the rotation of the leg requires an energy less than 100 x 10(-21) J, which is 4 orders of magnitude lower than state-of-the-art transistors.

Electrostatic force microscope

Molecular switch

Break junction

10.1103/physrevlett.90.066107

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Citations (190)

Inside Back Cover: Surface Trapping and STM Observation of Conformational Isomers of a Bis(Terpyridine) Ligand from Metallosupramolecular Grids (ChemPhysChem 7/2015)

ChemPhysChem (2015)

Sujoy Karan Christian Hamann Hao Tang Artur R. Stefankiewicz Jean‐Marie Lehn

The cover picture illustrates out-of-equilibrium high-energy conformations of bis(terpyridine) ligands that are trapped on a Au(111) substrate by disintegrating metallosupramolecular grids. The results described by S. Karan, R. Berndt et al., on p. 1370, add to our understanding of the behavior of molecules with internal degrees of freedom on surfaces.

Terpyridine

10.1002/cphc.201590038

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Magnetism and morphology in faceted B2-ordered FeRh nanoparticles

EPL (Europhysics Letters) (2016)

M. Liu P. Benzo Hao Tang Marion Castiella B. Warot-Fonrose

Whereas the bulk equiatomic FeRh alloy with B2 structure is antiferromagnetic (AFM) below 370 K, we demonstrate that the surface configuration can stabilize the low-temperature ferromagnetic (FM) state in FeRh nanoparticles in the 6–10 nm range. The most stable configuration for FM nanoparticles, predicted through first-principles calculations, is obtained in magnetron sputtering synthesized nanoparticles. The structure, morphology and Rh-(100) surface termination are confirmed by aberration-corrected (scanning) transmission electron microscopy. The FM magnetic state is verified by vibrating sample magnetometry experiments. This combined theoretical and experimental study emphasizes the strong interplay between surface configuration, morphology and magnetic state in magnetic nanoparticles.

Magnetism

Morphology

10.1209/0295-5075/116/27006

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Citations (10)

Rotation of a Single Molecule Within a Supramolecular Bearing

Science (1998)

James K. Gimzewski Christian Joachim R. R. Schlittler V. Langlais Hao Tang

Experimental visualization and verification of a single-molecule rotor operating within a supramolecular bearing is reported. Using a scanning tunneling microscope, single molecules were observed to exist in one of two spatially defined states laterally separated by 0.26 nanometers. One was identified as a rotating state and the other as an immobilized state. Calculations of the energy barrier for rotation of these two states show that it is below the thermal energy at room temperature for the rotating state and above it for the immobilized state.

Nanometre

10.1126/science.281.5376.531

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Citations (393)

A model conformational flip-flop molecular switch

AIP conference proceedings (1992)

Christian Joachim Gabin Treboux Hao Tang

In a mechanic molecular switch, electron transfer processes are controlled by a conformation change of the molecule induced by the move of one of its part. The change in through ligand electronic coupling induced by the displacement or the rotation of benzene ring(s) included in a non saturated ligand are discussed. This change is used to build a flip‐flop switch constituted of an isomerizable handle connected to a bis 1,4(4 pyridyl ethynyl) benzene ligand. Isomerization of the handle produces a rotation of the central benzene. Calculated energetic and electron transfer properties of this switch are presented.

Molecular switch

Flip-flop

10.1063/1.42677

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Citations (8)

On-surface preparation of coordinated lanthanide-transition-metal clusters

Nature Communications (2021)

Jing Liu Jie Li Zhen Xu Xiong Zhou Qiang Xue

The study of lanthanide (Ln)-transition-metal (TM) heterometallic clusters which play key roles in various high-tech applications is a rapid growing field of research. Despite the achievement of numerous Ln-TM cluster compounds comprising one Ln atom, the synthesis of Ln-TM clusters containing multiple Ln atoms remains challenging. Here, we present the preparation and self-assembly of a series of Au-bridged heterometallic clusters containing multiple cerium (Ce) atoms via on-surface coordination. By employing different pyridine and nitrile ligands, the ordered coordination assemblies of clusters containing 2, 3 and 4 Ce atoms bridged by Au adatoms are achieved on Au(111) and Au(100), as revealed by scanning tunneling microscopy. Density functional theory calculations uncover the indispensable role of the bridging Au adatoms in constructing the multi-Ce-containing clusters by connecting the Ce atoms via unsupported Ce-Au bonds. These findings demonstrate on-surface coordination as an efficient strategy for preparation and organization of the multi-Ln-containing heterometallic clusters.

Coordination number

10.1038/s41467-021-21911-z

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Citations (30)