[(Ph₃PAu)₆(dppeAu₂)(AuCl)₄Pd], an Icosahedral Au₁₂ Cluster with a Central Pd Atom

Abstract

COMMUNICATIONS 111IV molecular growth away from the surface in a similar fashion to that envisaged for the Cz; -induced polymerization observed with 1,3-butadiene; however, ethylene oxide oligomers should show an increasing tendency for unimolecular cyclization to form a relatively stable six-membered ring at the end of the chain as Coulombic repulsion weakens with increasing charge separation. Structures V and VI show the products of this cyclization which would inhibit further chain propagation.

Quantum‐Sized Gold Nanoclusters: Bridging the Gap between Organometallics and Nanocrystals

“…[11] Other M 13 icosahedral structures include the Au-centered complex [Au 9 Ag 4 A C H T U N G T R E N N U N G (PMePh 2 ) 8 X 4 ] (X= Cl, Br) [12] and the Pt-centered complex [PtAu 6 Ag 6 A C H T U N G T R E N N U N G (PPh 3 ) 6 ], which is face-capped by two AgI 3 motifs. [13] The icosahedron possesses twofold, threefold, and fivefold rotation axes (Figure 3).…”

“…M 8 , M 20 , M 34 , M 58 , M 92 , etc), [72] where M is monovalent. For Al n (trivalent), the clusters follow a different series of atomic numbers, such as Al 11 À , Al (34, 40, 58, 70, 106, 166, 220, etc). [75] All these bare clusters are modeled as superatoms.…”

Synthesis, Stability, and Photoluminescence Properties of PdAu10(PPh3)8Cl2 Clusters

“…The origin of the high stability of Pd-doped clusters was attributed to an increase of the interaction energy between the central atom and the surrounding cage structure by replacement of the central atom [20]. In addition, it has been reported that Pd atoms are located in the center of phosphine-stabilized Pd-Au bimetallic clusters (Pd-Au:PR 3 ) [21][22][23][24]. Therefore, it is expected that these clusters also exhibit higher stability than the monometal Au:PR 3 .…”

Gold–Heterometal Interactions and Bonds

“…The high nuclearity, mixed-metal clusters are quite well represented and most compounds fit into two main classes: (i) Pd-rich clusters derived from Pd-or Aucentered palladium polyhedra [499][500][501][502][503], and (ii) Au-rich clusters derived from Pdcentered Au 12 icosahedron [504][505][506][507][508][509]. Recent examples for the first type of clusters are the [(R 3 P)Au]AuPd 21 (m 3 -CO) 4 (m-CO) 16 15 (m-CO) 12 (PEt 3 ) 15 360 [501], Au 4 Pd 28 (m 3 -CO) 9 (m-CO) 13 (PMe) 16 361 [502] and Au 4 Pd 32 (m 3 -CO) 8 (m-CO) 20 (PMe) 14 362 [503].…”

“…Recent examples for the first type of clusters are the [(R 3 P)Au]AuPd 21 (m 3 -CO) 4 (m-CO) 16 15 (m-CO) 12 (PEt 3 ) 15 360 [501], Au 4 Pd 28 (m 3 -CO) 9 (m-CO) 13 (PMe) 16 361 [502] and Au 4 Pd 32 (m 3 -CO) 8 (m-CO) 20 (PMe) 14 362 [503]. Basic representatives for the second type of clusters are [(Ph 3 P)Au] 6 [(dppe)Au 2 ](AuCl) 4 Pd 363 [504] and [(Ph 3 P)Au] 8 (AuCl) 4 Pd 364 [505], which contains a complete (m 12 -Pd)Au 12 core. Several species whose bimetallic core can be described as fragments of the Pd-centered Au 12 Figure 4.6c) [43], which both exhibit a Pd-centered square antiprism arrangement of the gold atoms.…”