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Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

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Selection Rules: Photochemical Activation

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Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

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Updated: Jan 17, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

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Published on: July 3, 2015

Photoassisted Chemical Vapor Deposition Using (η⁴-Diene)Ru(CO)₃ Precursors.

Christopher R Brewer¹, Bishwaprava Das², Rashmi Singh²

¹Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, Texas 75080, United States.

ACS Applied Materials & Interfaces

|September 16, 2025

Summary

Researchers synthesized ruthenium complexes for photoassisted chemical vapor deposition (PACVD). They found specific precursors enable selective ruthenium deposition on functionalized surfaces, crucial for advanced microelectronics fabrication.

Keywords:

mechanism-based precursor design photoassisted chemical vapor deposition photolysis quantum yield ruthenium self-assembled monolayers

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Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Photoassisted chemical vapor deposition (PACVD) is a technique for depositing thin films.
Area-selective deposition requires precise control over where materials are placed on a surface.
Ruthenium (Ru) deposition is important for microelectronics and catalysis.

Purpose of the Study:

To synthesize and evaluate novel (η⁴-diene)Ru(CO)₃ complexes as precursors for Ru PACVD.
To investigate the area-selective deposition capabilities of these precursors onto functionalized self-assembled monolayers (SAMs).
To identify optimal precursor designs for selective Ru deposition.

Main Methods:

Synthesis of six (η⁴-diene)Ru(CO)₃ complexes.
Screening of precursors for PACVD using UV irradiation.
Deposition onto alkanethiolate SAMs with varying terminal groups (-COOH, -OH, -CH₃).

Main Results:

Four precursors were identified as suitable for Ru PACVD.
Selective Ru deposition on -COOH-terminated SAMs was achieved with (η⁴-2,3-dimethyl-1,3-butadiene)Ru(CO)₃, (η⁴-isoprene)Ru(CO)₃, and (η⁴-COT)Ru(CO)₃.
(η⁴-COT)Ru(CO)₃ demonstrated high selectivity at a significantly lower precursor dose.

Conclusions:

Precursor molecular design is critical for achieving area-selective Ru deposition via PACVD.
The choice of diene ligand influences precursor stability, reactivity, and deposition selectivity.
These findings provide a pathway for developing advanced precursors for selective nanofabrication.