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This article discusses the synthesis and characterization of a thermally stable monoruthenium acetylide radical species. The researchers examined the reactivity and properties of metal acetylide complexes, specifically focusing on mononuclear ruthenium acetylide radicals. They found that the choice of metal center and ligands significantly influenced the reactivity of these complexes. The researchers were able to isolate and characterize a mononuclear ruthenium acetylide radical species, which exhibited high thermal stability. This study provides insights into the design strategy for controlling the reactivity of radicals in metal complexes. [Extracted from the article]

In this work, the design, synthesis, and single‐molecule conductance of ethynyl‐ and butadiynyl‐ruthenium molecular wires with thioether anchor groups [RS=n‐C6H13S, p‐tert‐Bu−C6H4S), trans‐{RS−(C≡C)n}2Ru(dppe)2 (n=1 (1R), 2 (2R); dppe: 1,2‐bis(diphenylphosphino)ethane) and trans‐(n‐C6H13S−C≡C)2Ru{P(OMe)3}43hex] are reported. Scanning tunneling microscope break‐junction study has revealed conductance of the organometallic molecular wires with the thioacetylene backbones higher than that of the related organometallic wires having arylethynylruthenium linkages with the sulfur anchor groups, trans‐{p‐MeS−C6H4‐(C≡C)n}2Ru(phosphine)44n (n=1, 2) and trans‐(Th−C≡C)2Ru(phosphine)45 (Th=3‐thienyl). It should be noted that the molecular junctions constructed from the butadiynyl wire 2R, trans‐{Au−RS−(C≡C)2}2Ru(dppe)2 (Au: gold metal electrode), show conductance comparable to that of the covalently linked polyynyl wire with the similar molecular length, trans‐{Au−(C≡C)3}2Ru(dppe)263. The DFT non‐equilibrium Green's function (NEGF) study supports the highly conducting nature of the thioacetylene molecular wires through HOMO orbitals. [ABSTRACT FROM AUTHOR]

In this work, the design, synthesis, and single-molecule conductance of ethynyl- and butadiynyl-ruthenium molecular wires with thioether anchor groups [RS=n-C 6 H 13 S, p-tert-Bu-C 6 H 4 S), trans-{RS-(C≡C) n } 2 Ru(dppe) 2 (n=1 (1 R ), 2 (2 R ); dppe: 1,2-bis(diphenylphosphino)ethane) and trans-(n-C 6 H 13 S-C≡C) 2 Ru{P(OMe) 3 } 4 3 hex ] are reported. Scanning tunneling microscope break-junction study has revealed conductance of the organometallic molecular wires with the thioacetylene backbones higher than that of the related organometallic wires having arylethynylruthenium linkages with the sulfur anchor groups, trans-{p-MeS-C 6 H 4 -(C≡C) n } 2 Ru(phosphine) 4 4 n (n=1, 2) and trans-(Th-C≡C) 2 Ru(phosphine) 4 5 (Th=3-thienyl). It should be noted that the molecular junctions constructed from the butadiynyl wire 2 R , trans-{Au-RS-(C≡C) 2 } 2 Ru(dppe) 2 (Au: gold metal electrode), show conductance comparable to that of the covalently linked polyynyl wire with the similar molecular length, trans-{Au-(C≡C) 3 } 2 Ru(dppe) 2 6 3 . The DFT non-equilibrium Green's function (NEGF) study supports the highly conducting nature of the thioacetylene molecular wires through HOMO orbitals., (© 2021 Wiley-VCH GmbH.)