Leftovers

Nickon, Alex

doi:10.1016/b978-0-08-034481-2.50026-9

Cited by 8 publications

(8 citation statements)

References 107 publications

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“…The most representative case among eight-vertex polyhedra is the long sought for cubane, [31] C 8 H 8 , as well as its derivatives and Group 14 analogues with Si 8 , Ge 8 , or Sn 8 skeletons. In this case all the edges are occupied by bonds, but one can conceive polyhedra in which only a fraction of the edges do the job of setting the vertices in place.…”

Section: Summary Of Stereochemical Preferences By Ligandmentioning

confidence: 99%

The Rich Stereochemistry of Eight‐Vertex Polyhedra: A Continuous Shape Measures Study

Casanova

Llunell²,

Alemany³

et al. 2005

Chemistry A European J

808

533

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A stereochemical study of polyhedral eight-vertex structures is presented, based on continuous shape measures (CShM). Reference polyhedra, shape maps, and minimal-distortion interconversion paths are presented for eight-vertex polyhedral and polygonal structures within the CShM framework. The application of these stereochemical tools is analyzed for several families of experimental structures: 1) coordination polyhedra of molecular transition-metal coordination compounds, classified by electron configuration and ligands; 2) edge-bonded polyhedra, including cubane structures, realgar, and metal clusters; 3) octanuclear transition-metal supramolecular architectures; and 4) coordination polyhedra in extended structures in inorganic solids. Structural classification is shown to be greatly facilitated by these tools, and the detection of less common structures, such as the gyrobifastigium, is straightforward.

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Section: Summary Of Stereochemical Preferences By Ligandmentioning

confidence: 99%

The Rich Stereochemistry of Eight‐Vertex Polyhedra: A Continuous Shape Measures Study

Casanova

Llunell²,

Alemany³

et al. 2005

Chemistry A European J

808

533

View full text Add to dashboard Cite

show abstract

“…In Chemistry, these geometrical entities provide a simple and powerful way to represent the spatial arrangement of groups of atoms as, e.g., those directly bonded to a central atom, starting from the introduction of the tetrahedron by Van'Hoff and Le Bel to describe the stereochemistry of organic molecules and of the octahedron by Werner to explain the enantiomerism of metal coordination compounds. We can find nowadays examples of different kinds of molecules whose structures correspond to a variety of polyhedra, − from boranes to purely organic molecules, fullerenes, coordination complexes, metal clusters, or supramolecular arrangements. Yet many molecules show in solution a dynamic behavior, undergoing a fast interconversion between two polyhedral structures (polytopal rearrangement) at room temperature, while many others exhibit in the solid state structures that are intermediate between two of the highly symmetric polyhedral shapes.…”

mentioning

confidence: 99%

Minimal Distortion Pathways in Polyhedral Rearrangements

et al. 2004

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A definition of minimum distortion paths between two polyhedra in terms of continuous shape measures (CShM) is presented. A general analytical expression deduced for such pathways makes use of one parameter, the minimum distortion constant, that can be easily obtained through the CShM methodology and is herein tabulated for pairs of polyhedra having four to eight vertexes. The work presented here also allows us to obtain representative model molecular structures along the interconversion pathways. Several commonly used polytopal rearrangement pathways are shown to be in fact minimum distortion pathways: the spread path leading from the tetrahedron to the square, the Berry pseudorotation that interconverts a square pyramid and a trigonal bipyramid, and the Bailar twist for the interconversion of the octahedron and the trigonal prism. Examples of applications to the analysis of the stereochemistries of several families of metal complexes are presented.

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“…"5 Thus, secretion of lupinone without lycanthrokinin results in only lycomania. However, Kirschbaum's highly remarkable response rate of 100% among 24 "apparently healthy male volunteers" is a finding that we have been unable to duplicate. Apparently his New Jersey population of "normal" volunteers was actually aberrant in being naturally hypersusceptible to lycanthropic transmogrification (although perhaps not so unusual for their state, where beastly behaviour is not uncommon).…”

Section: Background Of Lycosomatization Researchmentioning

confidence: 80%

“…We recently discovered that there is a remarkable concordance between these data and those of Thakur and Sharmal9 concerning the lunar Buidogone periodicity of crime in India (Fig. 2) 24 Among the candidates culled from this source were several from their chapter on "edifice complexes" (e.g., "housane," "churchane" and the "birdcage hydrocarbon") (Fig. 3).…”

mentioning

confidence: 78%