Olefin‐Gold‐Komplexe, II. Gold(I)‐chlorid‐Komplexe cyclischer Mono‐, Di‐ und Triolefine

Abstract

Darstellung und Eigenschaften der Gold(1)-chlorid-Komplexe von Cyclopenten, Cyclohexen, Cyclohepten, cis-Cycloocten, trans-Cyclodecen, Cyclooctadien-( I S ) , cis.trans-Cyclodecadien-(1 S), Norbornadien, Dicyclopentadien, cis.cis.trans-und truns.trans.truns-Cyclododecatriem(l.5.9) werden beschrieben. Tab. 2. NMR-Spektren vonCyclenen mit 6 bis 10 Ringgliedern und ihren Au(1)-Komplexen (60 MHz, Losungsmittel CDC13, chemische Verschiebung in T, TMS als innerer Standard) Olefin Cyclohexeng) 4.32 S (2) 8.15 M (4) 8.37 M (4) Cyclohepten 4.19 M (2) 7.90 M (4) 8.38 M (6) cis-Cycloocten 4.38 M (2) 7.84 M (4) 8.50 M (8) trans-Cy clodecen 4.52 M (2) 7.95 M (4) 8.62 M (12) Komplex 4.02 S (2) 7.65 M (4) 8.30 M (4) 4.08 M (2) 7.55 M (4) 8.30 M (6) 4.44 M (2) 7.61 M (4) 8.47 M (8) 4.75 M (2) 7.64 M (4) 8.57 M (12)

Facile Synthesis of Gold Nanoparticles with Narrow Size Distribution by Using AuCl or AuBr as the Precursor

“…The lack of CC in octadecylamine will limit its coordination with AuCl to the amine group. Even though both CC and amine groups can form complexes with AuCl,34, 35 study of the coordination between Au + and C 2 H 4 and NH 3 has shown that the bond strength of [Au(CH 2 CH 2 )] + is larger than that of [Au(NH 3 )] + 39. 41 Accordingly, the complex formed from AuCl and oleylamine would be more stable than the complex formed from AuCl and octadecylamine.…”

“…The lack of C=C in octadecylamine will limit its coordination with AuCl to the amine group. Even though both C=C and amine groups can form complexes with AuCl, [34,35] …”

“…Au I halides, such as AuCl and AuBr, are readily available and their rich chemistry has long been recognized 33. Even though the low solubility in most solvents limited their use in the synthesis of Au nanoparticles, AuCl and AuBr can form soluble complexes with many ligands, such as alkenes,34 alkylamines,35 and alkylphosphines,36 and these complexes in turn can serve as Au precursors. Both AuCl and AuBr exhibit relatively low stability under ambient conditions and can undergo disproportionation to form Au 0 and Au III species even at room temperature.…”

AuI: an alternative and potentially better precursor than AuIII for the synthesis of Au nanostructures

“…77 However, their low solubility in most solvents has limited their use as precursors for the synthesis of Au nanostructures. As shown in a number of studies, this solubility problem can be easily solved by forming complexes with ligands (X), such as alkenes, 78 Unyong Jeong alkylamines, [79][80][81][82][83][84] alkylphosphines, [85][86][87][88][89] alkanethiols, [90][91][92] and halide ions. [93][94][95][96][97] These so-called Au I -X complexes can thus serve as good precursors to elemental Au.…”

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.…”