Targeting Ru(III) and Ru(I) η2-alkyne species, 2,2'-(iPr2E)2-substituted diphenylacetylenes (1-E, E = P, As) were em-ployed for the pre-paration of [ECCE]-coordinated ruthenium com-plexes. The re-actions between 1-E and cis-(MeCN)2(COD)RuCl2 led to the required Ru(II) starting materials cis-[ECCE]RuCl2(MeCN) (3-E). Upon oxi-dation of 3-E with PhICl2, the Ru(III) target com-plexes [ECCE]RuCl3 (7-E) were detectable for E = P and E = As, but only the arsa-deriva-tive 7-As was obtained in a pure form, namely via oxi-da-tion of cis-[AsCCAs]RuCl2(THT) (THT = tetrahydrothiophene). Upon re-duction of compounds 3-E, a hitherto unprecedented Ru(I) η2-alkyne complex, [PCCP]RuCl (9), was obtained for E = P. The former square planar Ru(I) complex (9) was characterized com-prehensively and examined in detail by means of DFT and CASSCF calculation. Upon treatment of 9 with TlPF6, a diamagnetic µ-Tl-bridged compound (10) with a nearly linear Ru-Tl-Ru array was formed and isolated in high yields. Careful analysis of the bonding situation suggested that the Ru-Tl-Ru moiety in 10 is best interpreted in terms of a 3c-4e- bond.
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