Intermediates in the formation of gold clusters. Preparation and x-ray analysis of [Au7(PPh3)7]+ and synthesis and characterization of [Au8(PPh3)6I]PF6

Abstract

respectively. All P-Au vectors point approximately to the center of the cluster with normal P-Au distances (2.27 ± 0.09 A). Physical data including 197Au Mossbauer and (solid-state) 31Pj'H) NMR are reported. [Au7L7]+ can also be observed during the reaction of L with the novel compound [AugL6I]PF6. The latter cluster could be prepared from the reaction of [Au9Lg]3+ with Bu4NI. The intermediacy of the title compounds in the formation and reactivity of gold cluster compounds will be discussed.Synthesis, Structure, and Magnetic Properties of Fluoride-Bridged Copper(II) Dimers. Crystal and Molecular Structures of Bis(^-fluoro)bis[tris(3,4,5-trimethylpyrazole-iV1 2)copper(II)] Bis (tetrafluoroborate) and Bis(^-fluoro)bis[(5-methylpyrazole-JV2)bis(3,5-dimethylpyrazole-Ar2)copper(II)] Bis (tetrafluoroborate)

Molecular and Electronic Structure of the Cluster [Au8(PPh3)8](NO3)2

“…Owing to the specific electronic interactions in centred gold clusters, [26] the radial Au-Au bond lengths [2.5735 (7) 2 is the shortest radial inter-metal distance among a representative set of phosphine-stabilized gold clusters. [5] Shorter or similar nonradial separations have been found for the following compounds with different geometries: 2.561 Å for an axial separation in an Au 7 cluster, [28,35] 2.562 Å for a peripheral separation in an Au 3 cluster, [36] 2.565 Å for a peripheral separation in an Au 10 cluster [37] and 2.572(1) Å for a peripheral distance in an Au 3 cluster. [38] Just recently, we revealed the extraordinary structure of [Au 14 (PPh 3 ) 8 (NO 3 ) 4 ], which has a shortest peripheral Au-Au distance of 2.5817(4) Å in addition to unique features like two neighbouring central gold atoms and Au(NO 3 ) ligands.…”

Phosphine-Coordinated Pure-Gold Clusters: Diverse Geometrical Structures and Unique Optical Properties/Responses

“…The interconversion between the two forms seems easy since they share a common structure in solution. (31) (Fig. 1) [42], which is obviously different from the icosahedron-based structures with approximately C 3v symmetry found in the conventional Au 11 (PAr 3 ) 10 clusters for various combinations of phosphine, sub-ligands, and counter anion [28,29,33,47,65,84,88,99] (Table 1 and 23 and 30 in Fig.…”

“…Later, in 1970s and early 1980s, definitive X-ray structure determinations were achieved independently mainly by a Nijmegen group [20][21][22][23][24][25][26][27][28][29][30][31][32][33] and Mingos et al [34][35][36][37][38][39][40][41][42][43] for various PGCs with nuclearity of 5 -13 [44][45][46][47][48][49]. Most of these clusters exploited monodentate phosphines as the ligands, revealing the general trend of the geometrical preference in the formation of ultrasmall clusters under unconstrained conditions.…”

Polymorphism of Phosphine-Protected Gold Nanoclusters: Synthesis and Characterization of a New 22-Gold-Atom Cluster

“…[ 27 ] It is interesting to note that many of these AuNCs, such as Au 6 , [34][35][36] Au 7 , [ 37,38 ] Au 8 , [ 39,40 ] Au 9 , [ 41,42 ] Au 10 , [ 43,44 ] and Au 11 , [45][46][47] have at least two different core geometries when different phosphine ligands are used. However, beyond Au 13 , only four different phosphine-protected AuNCs have been structurally characterized by X-ray crystallography, including Au 14 , [ 48 ] Au 20 , [49][50][51] Au 22 , [ 52 ] and Au 39 .…”