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Synthesis of a Water-soluble Metal–Organic Complex Array

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Published on: October 8, 2016

The Sulfur Monoxide-Water Complex.

Guohai Deng¹, Stephen M Goodlett¹, Caio M Porto¹

¹Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany.

Journal of the American Chemical Society

|July 8, 2026

Summary

Researchers generated and characterized the novel chalcogen-bonded sulfur monoxide-water complex (OS···OH₂). This complex is a key intermediate in atmospheric and interstellar sulfur monoxide chemistry.

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Area of Science:

Chemical Physics
Astrochemistry
Matrix Isolation Spectroscopy

Background:

Sulfur monoxide (SO) plays a crucial role in atmospheric and interstellar chemistry.
Understanding SO-water interactions is vital for modeling chemical processes in various environments.

Purpose of the Study:

To experimentally generate and characterize the chalcogen-bonded sulfur monoxide-water complex (OS···OH₂).
To investigate the stability and bonding characteristics of this complex compared to other isomers.

Main Methods:

Generation of metastable sulfoxylic acid (HOSOH) via flash vacuum pyrolysis.
Photolysis of HOSOH in argon matrices at 3.5 K to form the OS···OH₂ complex.
Characterization using matrix isolation infrared (IR) and UV/vis spectroscopy.
Utilizing ²H-isotope labeling for confirmation.
Focal point computations for theoretical analysis.

Main Results:

The chalcogen-bonded sulfur monoxide-water complex (OS···OH₂) was successfully generated and characterized.
Computational results indicate the triplet OS···OH₂ complex is energetically higher than singlet HOSOH.
The triplet OS···OH₂ complex is slightly more stable than the triplet hydrogen-bonded SO···H₂O complex after zero-point energy correction.

Conclusions:

The experimental synthesis and spectroscopic characterization of the OS···OH₂ complex provide new insights into SO chemistry.
Chalcogen bonding plays a significant role in the structure and stability of SO-water complexes.
This study contributes to a deeper understanding of interstellar and atmospheric chemical pathways involving sulfur compounds.