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Title: Formation and Evolution of Metallocene Single-Molecule Circuits with Direct Gold-π Links

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.2c01322· OSTI ID:1885809

Single molecule circuits with group 8 metallocenes are formed without additional linker groups in Scanning Tunnelling Microscope-based break junction (STMBJ) measurements at cryogenic and room temperature conditions with gold (Au) electrodes. We investigate the nature of this direct gold-π binding motif and its affect on molecular conductance and persistence characteristics during junction evolution. The measurement technique under cryogenic conditions tracks molecular plateaus through the full cycle of extension and compression. Analysis reveals that junction persistence when the metal electrodes are pushed together correlates with whether electrodes are locally sharp or blunt, suggesting distinct scenarios for metallocene junction formation and evolution. The top and bottom surfaces of the "barrel" shaped metallocenes present the electron-rich π system of cyclopentadienyl rings which interacts with the gold electrodes in two distinct ways. An undercoordinated gold atom on a sharp tip forms a donor-acceptor bond to a specific carbon atom in the ring. However, a small, flat patch on a dull tip can bind more strongly to the ring as a whole through Van der Waals interactions. Density functional theory (DFT) based calculations of model electrode structures provide an atomic-scale picture of these scenarios, demonstrating the role of these bonding motifs during junction evolution and showing that the conductance is relatively independent of tip atomic-scale structure. Furthermore, the non-specific interaction of the cyclopentadienyl rings with the electrodes enables extended conductance plateaus, a mechanism distinct from that identified for the more commonly studied, rod-shaped organic molecular wires.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1885809
Report Number(s):
BNL-223268-2022-JAAM
Journal Information:
Journal of the American Chemical Society, Vol. 144, Issue 14; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (67)

Inorganic and Organometallic Molecular Wires for Single-Molecule Devices journal February 2017
Metal/molecule/metal junction studies of organometallic and coordination complexes; What can transition metals do for molecular electronics? journal February 2018
Single-Molecule Conductance Studies of Organometallic Complexes Bearing 3-Thienyl Contacting Groups journal January 2017
Control of Single-Molecule Junction Conductance of Porphyrins via a Transition-Metal Center journal August 2014
Near-perfect conduction through a ferrocene-based molecular wire journal June 2005
Electronic Properties of Metallocene Wires conference January 2006
Tuning the spin transport properties of ferrocene-based single molecule junctions by different linkers journal July 2018
Ferrocenealkylsilane molecular rectifiers journal February 2018
Transition from stochastic events to deterministic ensemble average in electron transfer reactions revealed by single-molecule conductance measurement journal February 2019
Electronic and Transport Properties of Ferrocene: Theoretical Study journal April 2006
Redox-gated electron transport in electrically wired ferrocene molecules journal July 2006
Ferrocene-1,1′-dithiol as molecular wire between Ag electrodes: The role of surface defects journal February 2008
Enhancing Molecular Conductance of Oligo(p-phenylene ethynylene)s by Incorporating Ferrocene into Their Backbones journal August 2012
Enhancing electron transport in molecular wires by insertion of a ferrocene center journal January 2014
Quantum transport of the single metallocene molecule journal October 2016
Quantum interference in coherent tunneling through branched molecular junctions containing ferrocene centers journal August 2017
Greatly enhanced spin filtering of single ferrocene devices: An ab initio study journal November 2018
Controlled spin switching in a metallocene molecular junction journal December 2017
Spin dependent transmission of nickelocene-Cu contacts probed with shot noise journal February 2020
Atomic-scale spin sensing with a single molecule at the apex of a scanning tunneling microscope journal October 2019
Nonmagnetic single-molecule spin-filter based on quantum interference journal December 2019
Formation and Evolution of Single-Molecule Junctions journal March 2009
Angstrom-Scale Ruler Using Single Molecule Conductance Signatures journal May 2020
Temperature dependent tunneling conductance of single molecule junctions journal March 2017
Richness of molecular junction configurations revealed by tracking a full pull-push cycle journal January 2021
Charge Transport through Ferrocene 1,1′-Diamine Single-Molecule Junctions journal July 2016
Mechanically Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions journal August 2020
Structure and Energy Level Alignment of Tetramethyl Benzenediamine on Au(111) journal June 2011
Decompositional Incommensurate Growth of Ferrocene Molecules on a Au(111) Surface journal June 2006
Fragmentation and Distortion of Terpyridine-Based Spin-Crossover Complexes on Au(111) journal January 2019
Hard–Soft Chemistry Design Principles for Predictive Assembly of Single Molecule-Metal Junctions journal September 2021
Mechanically controlled binary conductance switching of a single-molecule junction journal March 2009
Calibration of the length of a chain of single gold atoms journal August 2002
Single Atom Adhesion in Optimized Gold Nanojunctions journal April 2008
Measurement of Single-Molecule Resistance by Repeated Formation of Molecular Junctions journal August 2003
Contact Chemistry and Single-Molecule Conductance:  A Comparison of Phosphines, Methyl Sulfides, and Amines journal December 2007
The Role of Oligomeric Gold–Thiolate Units in Single-Molecule Junctions of Thiol-Anchored Molecules journal February 2018
A reference-free clustering method for the analysis of molecular break-junction measurements journal April 2019
Fast Data Sorting with Modified Principal Component Analysis to Distinguish Unique Single Molecular Break Junction Trajectories journal January 2018
Unsupervised vector-based classification of single-molecule charge transport data journal October 2016
Ab initio molecular simulations with numeric atom-centered orbitals journal November 2009
Resolution-of-identity approach to Hartree–Fock, hybrid density functionals, RPA, MP2 and GW with numeric atom-centered orbital basis functions journal May 2012
Quantum chemistry calculations for molecules coupled to reservoirs: Formalism, implementation, and application to benzenedithiol journal May 2007
Spin-Polarized Electron Transport Across Metal–Organic Molecules: A Density Functional Theory Approach journal May 2013
Ab initio simulations of scanning-tunneling-microscope images with embedding techniques and application to C58-dimers on Au(111) journal January 2013
Generalized Gradient Approximation Made Simple journal October 1996
Accurate Molecular Van Der Waals Interactions from Ground-State Electron Density and Free-Atom Reference Data journal February 2009
Temperature-Dependent Tunneling in Furan Oligomer Single-Molecule Junctions journal February 2021
Formation and manipulation of a metallic wire of single gold atoms journal October 1998
Quantized conductance through individual rows of suspended gold atoms journal October 1998
Signature of Atomic Structure in the Quantum Conductance of Gold Nanowires journal November 2000
The Formation and Conducting Mechanism of Imidazole‐Gold Molecular Junctions journal March 2021
Single-Molecule Solvation-Shell Sensing journal February 2009
Electronic structure of ferricenium ion journal May 1970
Electronic structure, spectroscopy, and photochemistry of group 8 metallocenes journal February 2007
The chemical sensitivity of X-ray spectroscopy: high energy resolution XANES versus X-ray emission spectroscopy of substituted ferrocenes journal January 2013
Molecular structure and bonding in the 3d metallocenes journal November 1979
Aromaticity and ring currents in ferrocene and two isomeric sandwich complexes journal May 2011
Assembly of Ferrocene Molecules on Metal Surfaces Revisited journal January 2015
Unveiling nickelocene bonding to a noble metal surface journal May 2016
Self-Interaction Errors in Density-Functional Calculations of Electronic Transport journal September 2005
Zero-bias molecular electronics: Exchange-correlation corrections to Landauer's formula journal March 2006
Role of the exchange-correlation potential in ab initio electron transport calculations journal May 2007
Amine−Gold Linked Single-Molecule Circuits:  Experiment and Theory journal November 2007
Advances and challenges in single-molecule electron transport journal July 2020
Environmental Control of Single-Molecule Junction Transport journal May 2011
Is Indenyl a Stronger or Weaker Electron Donor Ligand than Cyclopentadienyl? Opposing Effects of Indenyl Electron Density and Ring Slipping on Electrochemical Potentials journal January 2020