1,5-Cyclooctadiene Complexes of Gold(I) and Gold(III)

Abstract

Recent reviews1,2 note the fact that olefin complexes of gold have not been isolated, although an auric-styrene complex has been postulated as an unstable intermediate in the reduction of some gold complexes by styrene.3 Both Au(III) and Au(I) olefin complexes

Structurally Characterized Coinage‐Metal–Ethylene Complexes

“…Early work on gold-alkene adducts mainly involves (alkene)AuCl type complexes. [134][135][136][137][138][139][140][141][142][143] These adducts tend to have poor thermal and solution stabilities. Recently, Cinellu and co-workers reported NMR spectroscopic data for several cationic goldethylene adducts supported by 6-substituted-2,2Ј-bipyridines.…”

Thermally Stable Gold(I) Ethylene Adducts: [(HB{3,5‐(CF3)2Pz}3)Au(CH2CH2)] and [(HB{3‐(CF3),5‐(Ph)Pz}3)Au(CH2CH2)]

“…However with gold(I), even complexes of substituted olefins are quite limited, and structurally characterized ethylene adducts are unknown. [3,4,[24][25][26][27][28][29][30][31][32][33][34][35][36] Herein, we report the synthesis and X-ray crystal structures of two remarkably stable gold(I) ethylene complexes ( Figure 1) that are easily obtained by using tris(pyrazolyl)borates [HB{3,5-(CF 3 ) 2 Pz} 3 ] À (where [HB{3,5-(CF 3 ) 2 Pz} 3 ] = hydrotris(3,5-bis(trifluoromethyl)pyrazolyl)borate) and [HB(3-(CF 3 ),5-(Ph)Pz) 3 ] À as supporting ligands. [37][38][39] The treatment of [HB{3,5-(CF 3 ) 2 Pz} 3 ]Na with gold(I) chloride under an ethylene atmosphere led to the gold(I) ethylene complex [(HB{3,5-(CF 3 ) 2 Pz} 3 )Au(C 2 H 4 )] (1) in good yield.…”

Chemistry of gold(I, III) complexes with organic ligands as potential MOCVD precursors for fabrication of thin metallic films and nanoparticles

“…For instance, the unstable complex of dichlorogold(III) with 1,5-cyclooctadiene quickly decomposes upon heating. Moreover, it is insoluble in most organic solvents and unstable when exposed to light [66]. Upon its heating above 50°С in CCl 4 in the presence of triphenylphosphine, the gaseous 1,5-cyclooctadiene is formed and its amount gradually increases when temperature increases.…”

“…Upon its heating above 50°С in CCl 4 in the presence of triphenylphosphine, the gaseous 1,5-cyclooctadiene is formed and its amount gradually increases when temperature increases. Chalk et al [66] have established that the complex has olefinic rather than allyl nature with one of chlorine atoms joined to the ring. Apart from that, dimeric complexes of Au(III) dichlorides with such ligand as butene-2, decene-5, cyclooctene, cyclodecene, norbornene, norbornadiene and bicyclopentadiene are known.…”

“…First reports regarding gold(I) olefinic complexes have appeared in 1964 when the lightsensitive [Au 2 Cl 2 (cod)] (cod = C 8 H 12 ) complex rapidly decompose upon heating has been obtained [66]. Along with these compounds, complexes with cyclohexene, cyclopentene, cyclooctene, cyclodecene, pentandiene, norbornadiene, cyclododecatriene and some other cyclic alkenes were synthesized [67][68][69].…”