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Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Related Experiment Video

Updated: Jun 10, 2026

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

Metal-Enhanced Charge Transport and its Mechanism in Atomically Precise Ruthenium Single-Molecule Devices.

Jie Guo¹, Qinghua Gao¹, Ping Duan¹

¹Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center For New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|April 20, 2026

Summary

This summary is machine-generated.

Researchers created a universal method for building single-molecule electronic devices using graphene electrodes. This precise technique allows for reliable charge transport studies, advancing molecular electronics.

Keywords:

charge transport edge‐selective oxidation hydrogen plasma etching organometallic ruthenium molecules single‐molecule devices

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Last Updated: Jun 10, 2026

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

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Published on: April 10, 2015

Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor

Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor

Published on: October 26, 2017

Area of Science:

Molecular electronics
Materials science
Nanotechnology

Background:

Investigating charge transport at the single-molecule level is crucial but challenging.
Existing methods lack the precision for reliable quantitative analysis.

Purpose of the Study:

To develop a universal strategy for fabricating highly uniform single-molecule electronic devices.
To enable precise covalent connections of molecules between graphene electrodes.
To accurately investigate intrinsic molecular transport properties.

Main Methods:

Edge-selective chemical oxidation of graphene electrodes to create atomically defined zigzag edges and nanogaps.
Covalent connection of organometallic ruthenium molecules (Ru 1, Ru 2, Ru 3) via amidation.
Fabrication of single-molecule devices with nanogapped graphene electrodes.

Main Results:

Achieved exceptional device-to-device uniformity (standard deviations ~1.04-1.27%).
Uncovered a metal-enhanced conductance effect with ultralow attenuation (β = 0.069 nm⁻¹).
Identified a barrier-lowering mechanism influencing charge injection through temperature-dependent transport measurements.

Conclusions:

The developed platform offers a reproducible and precise method for single-molecule device fabrication.
This enables accurate studies of molecular transport properties, paving the way for future functional molecular devices.
The findings advance the field of molecular electronics by overcoming key fabrication and characterization challenges.