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Titolo:
SPHEROALCANES MODELS AS EXAMPLES OF SHAPE S CORRESPONDING TO DIFFERENT SYMMETRY POINT-GROUPS
Autore:
RASSAT A; SEROUSSI D; COULOMBEAU C;
Indirizzi:
ECOLE NORMALE SUPER,DEPT CHIM,CNRS,URA 1679,24 RUE LHOMOND F-75231 PARIS 05 FRANCE UNIV GRENOBLE 1,LEDSS,CNRS,URA 332 F-38041 GRENOBLE 9 FRANCE
Titolo Testata:
Journal de chimie physique et de physico-chimie biologique
fascicolo: 11-12, volume: 91, anno: 1994,
pagine: 1683 - 1710
Fonte:
ISI
Lingua:
FRE
Soggetto:
MEDIUM-SIZED HYDROCARBONS; ABINITIO HEATS; CARBON CLUSTERS; SMALL RINGS; MOLECULES; C-60; ISOMERIZATIONS; PENTAPRISMANE; DODECAHEDRANE; TETRAHEDRANE;
Keywords:
SPHEROALCANES; SYMMETRY GROUPS; FULLERENES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
76
Recensione:
Indirizzi per estratti:
Citazione:
A. Rassat et al., "SPHEROALCANES MODELS AS EXAMPLES OF SHAPE S CORRESPONDING TO DIFFERENT SYMMETRY POINT-GROUPS", Journal de chimie physique et de physico-chimie biologique, 91(11-12), 1994, pp. 1683-1710

Abstract

This paper presents systematic construction of the planar formula of the smallest spheroalcanes (i.e. (CH)(N) molecules, N even, of which the planar formula is a simple, trivalent, planar graph) whose topological symmetry (i.e. their conformation of highest symmetry whatever their stable conformation) belongs to any finite point-group. Two-dimensional point-groups are first considered; it is shown that appropriate combination of greek letters Gamma and Delta may give example of those groups. We propose to use the symbols Gamma(n) and Delta(n), similar,to Bose of the Schonflies system for 3-D point-groups, for the 2-D point-groups called respectively n and nm (n even) or nmm (n odd) in the Hermann-Mauguin system. It is shown that objets belonging to any finiteaxial point-group may be obtained by placing a number of Gamma or Delta on the surface of a cylinder of revolution in suitable positions. Similarly, the formula for spheroalcanes of the corresponding symmetry may generally be obtained by a cylinder-like combination of(CH)(2q) fragments (1 less than or equal to q less than or equal to 6), of valency v = 2, 4 or 6 of the appropriate shape. A list of such fragments is given. The formula of spheroalcanes with (topological) high-symmetry may-be obtained from the graphs of selected regular and semi-regular polyhedra. A brief review of spheroalcanes already known experimentally and/or studied theoretically is given at the end of this paper.

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Documento generato il 28/11/20 alle ore 00:38:00