To develop advanced materials using metal complexes, it is better to prepare metal complexes contained in composite or hybrid films. To achieve this purpose, we synthesized ruthenium complexes with dihalogen-substituted benzendithiolate ligands, [(η
6-C
6Me
6)Ru(S
2C
6H
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To develop advanced materials using metal complexes, it is better to prepare metal complexes contained in composite or hybrid films. To achieve this purpose, we synthesized ruthenium complexes with dihalogen-substituted benzendithiolate ligands, [(η
6-C
6Me
6)Ru(S
2C
6H
2X
2)] (X = F, 3,6-Cl, Br, 4,5-Cl),
1b–
1e. We also investigated preparation of
1c or
1e containing polysiloxane composite films and their reactivity to CO gas. All ruthenium complexes
1b–
1e reacted with CO gas, and carbonyl ligand adducts
2b–
2e were generated. Ruthenium complexes
1b–
1e show two strong absorption peaks around 550 and 420 nm. After exposure to CO gas, these absorption peaks were immediately decreased without a peak shift. A similar trend was observed in
1c or
1e containing polysiloxane composite films. These results indicate that
1c and
1e were easily converted into
2c and
2e, both in the solution and the polysiloxane film during CO gas exposure.
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