Authors: Stevanović, Dragan 
Ilić, Aleksandar
Onişor, Cristina
Diudea, Mircea
Title: LEL - A newly designed molecular descriptor
Journal: Acta Chimica Slovenica
Volume: 56
Issue: 2
First page: 410
Last page: 417
Issue Date: 10-Jul-2009
Rank: M22
ISSN: 1318-0207
A correlating study of topological indices TIs provided by TOPOCLUJ software package and LEL, a newly proposed index built up on the eigenvalues of Laplacian matrix, on thirteen properties of octanes, revealed good correlating ability of a dozen selected TIs, all related to the Wiener index, and of LEL as well. LEL describes well the properties which are well accounted by the majority of the selected molecular descriptors: octane number MON, entropy S, volume MV,or refraction MR, particularly the acentric factor AF parameter, but also more difficult properties like boiling point, melting point and logP. LEL is the best correlated with the WK (Wiener-type number, taken the reciprocal of entries in the combinatorial Dp matrix, of higher rank, calculated by TOPOCLUJ software) indices. In a second set of polycyclic aromatic hydrocarbons, LEL was proved to be as good as the Randí % index (a connectivity index) and better than the Wiener index (a distance based index). In addition, it is well defined mathematically and shows interesting relations in particular classes of graphs, these recommending LEL as a new, powerful topological index. The actual study proved the considered TIs are basic topological descriptors in prediction of various molecular properties, with good perspective in QSPR/QSAR studies.
Keywords: Octanes | Polycyclic aromatic hydrocarbons | QSAR | QSPR | Topological indices
Publisher: Slovenian Chemical Society
Project: Slovenian Agency for Research, program P1-0285
Serbian Ministry of Science and Technological Development, Grants. 144015G and 144007

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