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Research Articles

New half-sandwich ruthenium(II) complexes of chelating (SS) organochalcogen ligands and their application as transfer hydrogenation catalysts

David O. YwayaSchool of Chemistry, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South AfricaView further author information
,
Halliru IbrahimSchool of Chemistry, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South AfricaView further author information
,
Holger B. FriedrichSchool of Chemistry, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South AfricaCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-1329-0815View further author information
ORCID Icon,
Muhammad D. BalaSchool of Chemistry, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South AfricaView further author information
&
Lynette SoobramoneySchool of Chemistry, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South AfricaView further author information
Received 30 Nov 2023, Accepted 25 Mar 2024, Published online: 06 Aug 2024

Figures & data

Figure 1. Reported scorpionate ligands with soft S-donor groups [Citation13–16].

Figure 1. Reported scorpionate ligands with soft S-donor groups [Citation13–16].

Scheme 1. Synthesis of imidazole-2-thione ligands 2a–c.

Scheme 1. Synthesis of imidazole-2-thione ligands 2a–c.

Scheme 2. Synthesis of the chelating (SS) half-sandwich η6-arene-Ru(II) complexes with organochalcogen ligands 3a–c.

Scheme 2. Synthesis of the chelating (SS) half-sandwich η6-arene-Ru(II) complexes with organochalcogen ligands 3a–c.

Figure 2. ORTEP plot showing the chelating SS^Ru(II) complex 3a with ellipsoids drawn at the 50% probability level. Hydrogen atoms and PF6- ions are omitted for clarity.

Figure 2. ORTEP plot showing the chelating SS^Ru(II) complex 3a with ellipsoids drawn at the 50% probability level. Hydrogen atoms and PF6- ions are omitted for clarity.

Figure 3. ORTEP plot of 3b showing the chelating SS ligand with ellipsoids drawn at the 50% probability level. Hydrogen atoms and PF6- ions are omitted for clarity.

Figure 3. ORTEP plot of 3b showing the chelating SS ligand with ellipsoids drawn at the 50% probability level. Hydrogen atoms and PF6- ions are omitted for clarity.

Figure 4. ORTEP plot of 3c showing the chelating SS ligand with ellipsoids drawn at the 50% probability level. Hydrogen atoms and PF6− ions are omitted for clarity.

Figure 4. ORTEP plot of 3c showing the chelating SS ligand with ellipsoids drawn at the 50% probability level. Hydrogen atoms and PF6− ions are omitted for clarity.

Table 1. Crystallographic data and structure refinement parameters for 3a–c.

Table 2. Selected bond distances (Å) and angles (°) for 3a, 3b, and 3c.

Table 3. Optimization of reaction conditions for the transfer hydrogenation of cyclohexanone catalyzed by 3c.

Table 4. Transfer hydrogenation of some ketones catalyzed by 3a-c.

Supplemental material

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