Low-Nuclearity Platinum Clusters Supported on Graphite

1990 ◽  
pp. 150-159 ◽  
Author(s):  
P. Gallezot ◽  
D. Richard ◽  
G. Bergeret
Keyword(s):  
Platinum Clusters

scholarly journals Crystallographic and structural characterization of heterometallic platinum compounds Part VII. Heterohepta- and heterooctanuclear clusters

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Milan Melnik ◽  
Peter Mikuš ◽  
Clive E. Holloway
Keyword(s):  
Structural Characterization ◽  
Structural Parameters ◽  
Bond Distance ◽  
Point Of View ◽  
Platinum Compounds ◽  
Metal Atoms ◽  
Platinum Clusters ◽  
Structural Point

AbstractThis review classifies and analyzes over fifty heterohepta- and heterooctanuclear platinum clusters. There are eight types of metal combinations in heteroheptanuclear: Pt6M, Pt5M2, Pt4M3, Pt3M4, Pt2M5, PtM6, Pt3Hg2Ru2 and Pt2Os3Fe2. The seven metal atoms are in a wide variety of arrangements, with the most common being one in which the central M atom (mostly M(I)) is sandwiched by two M3 triangles. Another arrangement often found is an octahedron of M6 atoms asymmetrically capped by an M atom. The shortest Pt-M bond distances (non-transition and transition) are 2.326(1) Å (M = Ga) and 2.537(6) Å (M = Fe). The shortest Pt-Pt bond distance is 2.576(2) Å.In heterooctanuclear platinum clusters there are eight types of metal combinations: Pt6M2, Pt4M4, Pt3Ru5, Pt2M6, PtM7, Pt2W4Ni2, PtAu6Hg and PtAu5Hg2. From a structural point of view, the clusters are complex with bicapped octahedrons of eight metal atoms prevailing. The shortest Pt-M bond distances (non-transition and transition) are 2.651(3) Å (M = Hg) and 2.624(1) Å (M = Os). The shortest Pt-Pt bond distance is 2.622(1) Å. These values are somewhat longer than those in the heteroheptanuclear clusters. Several relationships between the structural parameters were found, and are discussed and compared with the smaller heterometallic platinum clusters

Methane activation on unsupported platinum clusters

1990 ◽  
Vol 112 (10) ◽  
pp. 3742-3749 ◽  
Author(s):  
D. J. Trevor ◽  
D. M. Cox ◽  
A. Kaldor
Keyword(s):  
Methane Activation ◽  
Platinum Clusters

scholarly journals Crystallographic and structural characterization of heterometallic platinum complexes Part VI. Heterohexanuclear complexes

2014 ◽  
Vol 12 (11) ◽  
pp. 1101-1126 ◽  
Author(s):  
Milan Melník ◽  
Peter Mikuš ◽  
Clive Holloway
Keyword(s):  
Metal Ion ◽  
Structural Parameters ◽  
Bond Distance ◽  
Transition Element ◽  
Platinum Complexes ◽  
Hard Metals ◽  
Wide Range ◽  
Platinum Clusters ◽  
Soft Metal ◽  
Independent Molecules

AbstractThis review classifies and analyzes heterohexanuclear platinum clusters into seven types of metal combinations:Pt5M, Pt4M2, Pt3M3, Pt2M4, PtM5, Pt2M3M′, and Pt2M2M2′. The crystals of these clusters generally belong to six crystal classes: monoclinic, triclinic, orthorhombic, tetragonal, trigonal and cubic. Among the wide range of stereochemistry adopted by these clusters, octahedral and capped square-pyramidal are the most common. Although platinum is classified as a soft metal atom, it bonds to a variety of soft, borderline and hard metals. Nineteen different heterometal ions are involved in hexanuclear platinum clusters. The shortest Pt-M bond distance in the case of M being a non-transition element is 2.395(4) Å for germanium and for M being a transition metal ion it is 2.402(2) Å for Cobalt. The shortest Pt-Pt bond distance observed in these clusters is 2.532 Å. Several relationships between the structural parameters are identified and discussed. Some clusters exist in two isomeric forms and some show crystallographically independent molecules within the same crystal. Such isomers and independent molecules are examples of distortion isomerism.

Small Platinum Clusters in Zeolites:  A Density Functional Study of CO Adsorption on Electronically Modified Models

1999 ◽  
Vol 103 (1) ◽  
pp. 216-226 ◽  
Author(s):  
Anna Maria Ferrari ◽  
Konstantin M. Neyman ◽  
Thomas Belling ◽  
Markus Mayer ◽  
Notker Rösch
Keyword(s):  
Density Functional ◽  
Co Adsorption ◽  
Functional Study ◽  
Density Functional Study ◽  
Platinum Clusters

Synthesis of some pentanuclear platinum clusters [Pt5(CO)6(L)4]. The X-ray structure of [Pt5(μ-CO)5(CO)(PCy3)4]

2005 ◽  
Vol 358 (3) ◽  
pp. 497-503 ◽  
Author(s):  
Zoltàn Béni ◽  
Renzo Ros ◽  
Augusto Tassan ◽  
Rosario Scopelliti ◽  
Raymond Roulet
Keyword(s):  
X Ray ◽  
Platinum Clusters

Thermal Evolution and Instability of CO-Induced Platinum Clusters on the Pt(557) Surface at Ambient Pressure

2016 ◽  
Vol 138 (4) ◽  
pp. 1110-1113 ◽  
Author(s):  
Jeongjin Kim ◽  
Myung Cheol Noh ◽  
Won Hui Doh ◽  
Jeong Young Park
Keyword(s):  
Thermal Evolution ◽  
Ambient Pressure ◽  
Platinum Clusters

Stereochemistry of heterometallic platinum clusters

2008 ◽  
Vol 61 (19) ◽  
pp. 3021-3065 ◽  
Author(s):  
M. Melnik ◽  
J. Garaj ◽  
C.E. Holloway
Keyword(s):  
Platinum Clusters

Thermal NH Bond Activation on Anionic and Cationic Platinum Clusters: Non-Predetermined Reaction Pathways Indicate Transitions to a Bulk Surface Reactivity

2009 ◽  
Vol 15 (34) ◽  
pp. 8465-8474 ◽  
Author(s):  
Milan Ončák ◽  
Yali Cao ◽  
Robert F. Höckendorf ◽  
Martin K. Beyer ◽  
Rudolf Zahradník ◽  
...  
Keyword(s):  
Bond Activation ◽  
Surface Reactivity ◽  
Reaction Pathways ◽  
Bulk Surface ◽  
Platinum Clusters

Diffusion and dissociation of platinum clusters on Pt(111)

1999 ◽  
Vol 437 (1-2) ◽  
pp. 29-37 ◽  
Author(s):  
Kentaro Kyuno ◽  
Gert Ehrlich
Keyword(s):  
Platinum Clusters
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