Alkynyl tetranuclear

In addition to the well-known luminescent Re(NAN)(GO)3 moieties, the electrochemically active ferrocenyl groups were employed as building blocks for the construction of polynuclear silver(i) alkynyl complexes. Yip reported the synthesis, structural characterization, and electrochemistry of a tetranuclear complex, [Ag3(dppm)3(C=CFc)(OTf)]OTf 96 (Figure 43), with the Ag3(dppm)3 skeletal unit being capped by a ferrocenylethynyl ligand on one side and an OTP anion on the other, all in a /Z3-771-bonding mode.170... 

With the more sophisticated dialkynylcalixarenes as ligands, tetranuclear gold alkynyl complexes 8a and 8b (Fig. 13), in which both a- and n-coordinated gold centers are present and exhibit short intramolecular Au Au contacts of 3.1344(8) and 3.2048(8) A, were obtained [104], The complexes were found to be strongly luminescent at 591-616 nm in the solid state, whereas in chloroform solution or 77 K CHCl3-MeOH-EtOH glass... 

Interesting rhombohedral silver-alkynyl cage compounds [Agi4(C=C Bu)2(X)][BF4] (X = F, Cl, Br) with Oh molecular symmetry, apparently form templates around the halide ions. The silver... silver edge distances are about 2.9 A, similar to the silver... silver distances observed in the tetranuclear clusters. 

In a paper on the synthesis of tetranuclear bis(p -alkynyl) transition metal complexes the crystal structure of [(p -C5H4SiMc3)2Ti(CCFc)2]CuBr has been described. The synthetic work was based on the metathesis reactions of trinuc-lear [Ti](CCFc)2 with one equivalent of [MX] (M = Cu, Ag X = Cl, Br, OTf, BF4). ... 

FIGURE 5.7 Luminescent tetranuclear gold(I) alkynyl complexes with a novel planar Tj, Tj -coordination mode. 

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