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Journal of Structural Chemistry

2013 year, number 1

CARBOMETALLIC DERIVATIVES OF C1v AND C5v BORANES: ENUMERATION AND IDENTIFICATION OF SUBSTITUTION ISOMERS AND THE CALCULATION SCHEME OF THE PROPERTIES OF C5v BASED ON PASCAL'S TRIANGLE NUMBERS

V. M. Smolyakov, D. V. Sokolov, D. Yu. Nilov, V. V. Grebeshkov
Keywords: cycle index, generating functions, chiral and achiral substitution isomers, additive schemes, boranes, pair and multiple non-valence interactions, molecular graph, polygonal numbers, Pascal's triangle

Abstract

Combinatorial analysis methods are employed to solve the problem of determining the number and form of X-substituted (X, XY, … are some substituents) of carbometallic derivatives of boranes (C5H5)Co(С2B9H11) C1v and (C5H5)Co(С5B6H11) C5v (over vertices) based on Polya's theorem. formulas of Z symmetry and generating functions of the number of chiral and achiral substitution stereoisomers are determined. Family distributions of the isomers depending on the form and number of substituents and depending on the number m of possible substitution sites are found. Mono-, di-, and tri-X-substituted (X = CH3, F, …) isomers of (С5Н5)Со(C5B6H11) C5v are identified. Based on the partition of simple (n) and triangular numbers (K3) of Pascal's triangle, additive schemes are obtained which take into account valence and non-valence pair interactions of atoms in the polyhedron framework and contain 2, 6, and 23 parameters for the calculation of properties of Х-substituted borane (C5H5)Co(С5B6H11) C5v.