Treatment of 2,4,6-tris(4-bromophenyl)-1,3,5-triazine (2,4,6-(4-BrC6H4)3-1,3,5-C3N3)with HC⋮CSiMe3 in the presence of Pd(PPh3)4/CuI and NEt3 produces 2,4,6-[4-(Me3SiC⋮C)C6H4]3-1,3,5-C3N3, which reacts with Bu4NF to yield 2,4,6-[4-(HC⋮C)C6H4]3-1,3,5-C3N3. Reaction of 2,4,6-[4-(HC⋮C)C6H4]3-1,3,5-C3N3 with AuCl(PPh3) in the presence of NEt3 produces the gold acetylide complex 2,4,6-[4-((PPh3)AuC⋮C)C6H4]3-1,3,5-C3N3. Treatment of 2,4,6-[4-(HC⋮C)C6H4]3-1,3,5-C3N3 with cis-RuCl2(dppe)2/NaPF6 followed by NEt3 gives 2,4,6-[4-(Cl(dppe)2RuC⋮C)C6H4]3-1,3,5-C3N3, which reacts with p-HC⋮CC6H4R (R = OCH3, NO2) to give 2,4,6-[4-((4-RC6H4C⋮C)(dppe)2RuC⋮C)C6H4]3-1,3,5-C3N3. The electrochemical and photophysical properties of the new complexes have been investigated.

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Treatment of RuCl(dppm)(η5-C9H7) with alkynes HC≡C(C6H4)nC≡CH (n = 1, 2) in the presence of TlPF6 and t-BuONa affords the bimetallic ruthenium acetylide complexes [(η5-C9H7)(dppm)Ru]2(µ-C≡C(C6H4)nC≡C). Reactions of the hydride complex RuH(dppm)(η5-C9H7) with HC≡C(C6H4)nC≡CH (n = 1, 2) in refluxing toluene give the bimetallic ruthenium alkenyl complexes [(η5-C9H7)(dppm)Ru]2(µ-CH=CH(C6H4)nCH=CH). The electrochemical properties of the new complexes have been investigated by cyclic voltammetry, which reveals that the organic spacer –CH=CHC6H4CH=CH– is more effective than –C≡CC6H4C≡C– in mediating electronic communication between the two ruthenium moieties.Key words: ruthenium, bimetallic, acetylide, insertion, electrochemistry.