Alkynyl trinuclear complex

The synthesis and structural characterization of luminescent di- and tri-nuclear organopalla-dium complexes with rigid conjugated alkynyl-aryl bridges and preliminary experiments on the formation of the first generation metallodendrimer using the trinuclear complex as the backbone were reported.102... 

Scheme 78. Trinuclear iron derivative of an alkoxy(l-alkynyl)carbene complex.

The alkynyl ligand of Pt-phosphine complexes serves as the metallaligand that binds Ag(i) or Cu(i), forming di- or trinuclear complexes. Cationic Ag(i) and Gu(i) centers are bonded with two m-dialkylplatinum complexes to yield the trinuclear complexes with 7r-coordination of the four alkynyl ligands to a alkynyl ligands of the complexes with a /r< / i -structure to GuCNOa) forms the PtCu2 complex 709. " ... 

The platinum mononuclear complexes [Pt(C=CR)4] (39) and [Pt(CgF5)2 (C = CR)2] (40) have been used to synthesise di- and trinuclear complexes containing doubly bridged alkynyl systems. Their reactions with mercury halides afford 1 2 adducts (314-316) or 1 1 adducts (317-319) (Scheme 85). ° ... 

Aza[3]ferrocenophanes, synthesis, 6, 187 Azaheterocycles, alkynylation with Ir catalysts, 7, 340 7-Azaindole, in trinuclear Ru and Os clusters, 6, 725 Azametallacyclobutane, tantalum complexes, 5, 168 Azametallacyclopropane, with niobium, 5, 87 Aza-oxo ligands, chromium complexes, 5, 353 Azaphosphirenes, with tungsten carbonyls, 5, 623 2H-Azaphosphirenes, with tungsten carbonyls, 5, 679 Aza-titanacyclopentenes, synthesis, 4, 407-408 Azavinylidenes... 

As a first interesting example, Stang and Critell reported in 1990 the alkynylation of Vaska complexes 16 and 17 with alkynyliodonium triflates at room temperature in excellent yield (Scheme 9) [88]. Using bis-alkynyliodonium salts, the method could be extended to the formatiOTi of binuclear complexes such as 18 and 19, or even trinuclear systems [89-91]. These conjugated polymetallic complexes have great potential for applications in nonlinear optics, organic conductors, or liquid crystals. 

The alkynyl ligand of Pt(ii) complexes coordinates to Pt(0) centers in a 7r-manner to form the complex having the alkynyl ligand bonded to the two metals in a cr,7r-fashion. Thus, a 2 1 reaction of Pt(C=CBu02(cod) 733 with PtCl2(cod) in the presence of NaOEt produces a trinuclear Pt -Pt -Pt complex 734 (Equation (143)). ... 

Reaction of dialkynylplatinum complex 737 with the hydridoplatinum complex 738 forms a trinuclear zwitterionic hydrido complex with the alkynyl ligands functioning as bridging o-,7r-ligands (739, Equation (145)). ... 

Au Au interactions also play a pivotal role in the photophysical characteristics of Au(i) alkynyl complexes. A red shift in the solid-state emission energies relative to that in solution is commonly observed for complexes with such interactions [87, 183, 188, 189]. In addition, the nonlinear optical (NLO) properties of a number of di- and trinuclear Au(i) alkynyl complexes with di- and tri-ethynylbenzene cores have been investigated by Humphrey and coworkers [191-194], These complexes may serve as potential NLO materials with reasonable first and second hyperpolarizabilities. Introduction of nitro group into these systems was suggested to enhance the optical nonlinearity. 

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