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A 2 nm Molecular Ladder with a Twisted Backbone.

Suriguga Meng¹, Yingying Xu¹, Zhiyu Zhang¹

¹College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.

Organic Letters

|July 23, 2025

Summary

Researchers synthesized a novel molecular ladder with antiaromatic pentagonal rings for organic electronics. This material shows robust redox properties and promising hole mobility in transistors.

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Area of Science:

Organic electronics
Materials science
Supramolecular chemistry

Background:

Molecular ladders with fused-ring architectures are key materials in organic electronics.
Their electronic properties are influenced by their unique structural characteristics.

Purpose of the Study:

To synthesize and characterize a novel molecular ladder with embedded antiaromatic pentagonal rings.
To investigate its structural, redox, and charge transport properties.

Main Methods:

Chemical synthesis of the molecular ladder.
X-ray crystallographic analysis to determine structure and packing.
Electrochemical measurements to study redox behavior.
Fabrication and characterization of single-crystal organic field-effect transistors.

Main Results:

A molecular ladder with a 2.000(1) nm backbone and 4-fold antiaromatic pentagonal rings was successfully synthesized.
Crystallographic analysis revealed a twisted backbone with tight intermolecular packing (shortest contact 3.210(9) Å).
The material demonstrated robust redox behavior (up to 3e- oxidation and 4e- reduction) due to diindenonaphthalene and diindenotetracene characteristics.
A maximum hole mobility of 0.035 cm2 V-1 s-1 was achieved in single-crystal organic field-effect transistors.

Conclusions:

The synthesized molecular ladder possesses unique structural and electronic properties.
Its robust redox behavior and charge transport capabilities make it a promising candidate for organic electronic applications.