High-nuclearity [Pd13Ni13(CO)34]4− containing a 26-atom Pd13Ni13 core with an unprecedented five-layer close-packed triangular stacking geometry: possible substitutional Pd/Ni crystal disorder at specific intralayer nickel sites †

Nanosized [Pd52(CO)36(PEt3)14] and [Pd66(CO)45(PEt3)16] Clusters Based on a Hypothetical Pd38 Vertex‐Truncated ν3 Octahedron

“…In 2 , which has pseudo‐ C 3 v symmetry, the alternation of the stacked layers (Figure 2) depends on the 〈111〉 direction: namely, the layer‐stacking sequence along the proper C 3 axis is abacba, whereas along each of the other three symmetry‐equivalent 〈111〉 directions the sequence is ababca. Similar four‐, five‐, and six‐layer stacking sequences involving mixed ccp/hcp metal arrangements have been observed in other large carbonyl clusters, including [Rh 22 (CO) 37 ] 4− (abcb),9a [Pd 13 Ni 13 (CO) 34 ] 4− (abcac),9b [Pd 16 Ni 16 (CO) 40 ] 4− (abcbca),9c [Ni 32 Pt 24 (CO) 56 ] 6− (abacbc sequence along its threefold axis),9d and neutral [Pd 54 (CO) 40 (PEt 3 ) 14 ] (abaca) 2k…”

Synthesis and Characterisation of ν3‐Octahedral [Ni36Pd8(CO)48]6− and [Ni35Pt9(CO)48]6− Clusters Displaying Unexpected Surface Segregation of Pt Atoms and Molecular and/or Crystal Substitutional Ni/Pd and Ni/Pt Disorder

“…Most reported high‐nuclearity Ni–Pd, Ni–Pt, and Pd–Pt carbonyl clusters exhibit a clear‐cut site and composition preference of the Pd and Pt atoms that is illustrated by the stoichiometric and ordered structure of [Ni 13 Pd 13 (CO) 34 ] 4− ,1 [Ni 16 Pd 16 (CO) 40 ] 4− ,2 [Ni 26 Pd 20 (CO) 54 ] 6− ,2 [Ni 36 Pt 4 (CO) 45 ] 6− ,3, 4 [HNi 38 Pt 6 (CO) 48 ] 5− ,5, 6 [Ni 24 Pt 14 (CO) 44 ] 4− ,7 [Ni 9 Pd 33 (CO) 41 (PPh 3 ) 6 ] 4− ,8 [Ni 4 Pd 16 (CO) 22 (PPh 3 ) 4 ] 2− 9 and [H 12 Pd 28 Pt 13 (CO) 27 (PMe 3 )(PPh 3 ) 12 ] 10. In general, the structures of the above species show that interactions among similar atoms are maximised and the most noble metal tends to occupy the core of the metal‐atom polyhedron.…”

Theory of the Structure of Coherent Boundaries in ZrO2 Nanoparticles

“…Let us list only a number of objects waiting for their explanation: clusters with an unprecedented shell geometry [7], clusters with an unprecedented close packing [8], new families of magic clusters [9], exotic noncrystalline helical structures [10], magic helices [11], puzzling nanowires [12], specific packings in Grassmannian manifolds [13], exotic close packings in small-sized clusters of colloidal microspheres [14], onion-like structures [15], phantasmagorical fulleroids [16], "centaurs" with coherent boundaries [17,18], etc.…”