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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...

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Ligand effect on In-Ti-oxo nanoclusters for nanolithography.

Jiao Wu^1,2, Jiali Chen^1,3, Liming Wang⁴

¹State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China. xfyi@fjirsm.ac.cn.

Materials Horizons

|May 27, 2025

Summary

Researchers developed a new ligand-regulation strategy for indium-titanium-oxo clusters, enabling precise control for advanced nanolithography. This breakthrough enhances solution processability and film quality, paving the way for high-resolution patterning.

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Area of Science:

Materials Science
Nanotechnology
Inorganic Chemistry

Background:

Metal-oxo clusters show potential for nanolithography.
Controlling their structure and composition for better processability and film properties is challenging.

Purpose of the Study:

To introduce a novel ligand-regulation strategy for assembling Indium-Titanium-oxo clusters.
To investigate the application of these clusters in nanolithography.
To understand structure-property relationships for enhanced performance.

Main Methods:

Modular assembly of In-Ti-oxo clusters using indium-based metalloligands.
Stabilization of isomeric In4Ti12-cores with varying shells (InOC-20V to InOC-23H).
Characterization using DFT calculations, TGA-MS, XPS, and AFM-IR.

Main Results:

Identified distinct solution processabilities among isomers based on SBU connectivity (vertical vs. parallel).
Demonstrated high-quality film formation and 50 nm resolution patterning with InOC-20V using spin-coating.
Decarboxylation of ligands was identified as a key factor in solubility switching for lithography.

Conclusions:

Ligand-regulation offers a generalizable method for synthesizing diverse In-Ti-oxo clusters.
Tailored structural modulation of clusters is effective for improving solution processability and lithography performance.
These findings provide insights for future design of cluster materials for nanolithography.