Gold-alkynyl

In summary, [Au(alkynyl)(CNR)j complexes also show mesomorphic behavior but, in contrast to the halide-isocyanide derivatives, they are thermally less stable and usually decompose before or at the clearing temperatures. This thermal instability is thought to be associated with the gold-(alkynyl) bond and makes these compounds... 

Diethynyl-pyridine was reacted with 2 equiv. of (Me2S)AuCl to give a gold alkynyl as an insoluble coordination polymer of unknown structure. This product could be dissolved in organic solvents with cBuNG to afford the bis(isocyanide) complex with an angular structure (Scheme 50).214... 

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... 

Abstract The NLO properties of iron, ruthenium, osmium, nickel, and gold alkynyl complexes and... 

The studies summarized above involve complexes with 18 valence electron metal centres. We also examined related 14 electron gold alkynyl complexes. Molecular quadratic hyperpolarizabilities of gold alkynyl complexes by HRS measurements at 1.064 xm are given in Table 3, and the most efficient gold-containing complex is depicted in Figure 6. 

Table 3. Molecular second-order NLO results for gold alkynyl complexes ...

Morrall et al. review NLO properties of iron, ruthenium, osmium, nickel, and gold alkynyl complexes, which the authors have prepared. HRS (at 1.064 p,m) and Z-scan (at 0.8 p,m) measurements have been employed. Structure-property relations have been established. Static first hyperpolarizability values have also been computed employing the two-state model. They relate the NLO coefficients to several factors and properties (e.g. ease of oxidation, ir-system length, dimensionality ). 

For the metal—alkyne fragmait, nonlinearity also increases upon increasing valence electron count [14 valence electron (triphenylphosphine) gold alkynyl compounds <18 valence electron (cyclopentadienyl) (triphenylphosphine)nickel, and (cyclopentadienyl) bis(triphenylphosphine) ruthenium alkynyl compounds] and increasing ease of oxidation (less easily oxidizable (cyclopentadienyl)(tri-phenylphosphine)nickel alkynyl complexes < more easily oxidizable (cyclopen-tadienyl)bis(triphenylphosphine)ruthenium alkynyl complexes). 

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