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- W2496285910 abstract "Valence molecular connectivity indices are indices based on the concept of valence delta, d v, that can be derived from general chemical graphs or chemical pseudographs. A general graph or pseudograph is a graph with multiple edges and loops and it can be used to encode, through the valence delta, chemical entities like the sigma-, pi- and non-bonding n-electrons. Two other graph-theoretical concepts that can also be derived from chemical pseudographs are the intrinsic (I) and the electrotopological state (E) values that are the main tools used to define the valence delta of the pseudoconnectivity indices, ?I,S. Complete graphs can, instead, be used to encode, through a new type of valence delta, the core electrons of any type of atoms in a molecule. The connectivity indices either valence connectivity or pseudoconnectivity indices are the starting point to develop, by the aid of a dual procedure, the dual connectivity indices, i.e., the dual connectivity, valence connectivity and pseudoconnectivity indices. The dual indices show the interesting property that not only some of them can assume negative values but also that they can cover a wide range of numerical values. Graph concepts can also be used to deal with the problem of the hydrogen contribution in hydrogen depleted chemical graphs, which are the normal type of graphs used in chemistry. For this purpose a perturbation parameter can be introduced into the definition of the valence delta that allows to differentiates among compounds with similar hydrogen-suppressed chemical graphs but different number of hydrogen atoms, like CH3F and BH2F. The new definition of the central parameter of the molecular connectivity theory, the valence delta, consent to define of a completely new set of connectivity indices, which can be distinguished by their configuration and that can advantageously be used to model different properties and activities of compounds." @default.
- W2496285910 created "2016-08-23" @default.
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- W2496285910 date "2011-10-04" @default.
- W2496285910 modified "2023-09-26" @default.
- W2496285910 title "A QSAR/QSPR Study with Graph-Theoretical Indices based on a New Type of Vertex Degree" @default.
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- W2496285910 doi "https://doi.org/10.4018/978-1-60960-860-6.ch006" @default.
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