Fundamental Junctive Simplexes

Fundamental junctive/disjunctive processes involving interactions between two or three fundamental simplexes vide infra) are described as binary and ternary processes, respectively. A given process - be it binary or ternary- is either simple or complex. The junctive process is simple, if only junctive or disjunctive components are present it is complex, if jimctive and disjunctive components are both present vide infra). 

The simplest binary junctive process (l,l)j results from atom-atom combination e.g. 32- [33], 34- [35], 36- [37]. The (l,2)j atom-bond, atom-face junctive processes are exemplified by transformations 38- [39] and 40- [41], respectively. The (2,2)j junctive processes resulting from bond-bond, bond-face, and face-face associations are represented by 42- [43], 44- [45] and 46- [47], respectively. 

The ternary (1,1,l)j junctive process resulting from atom-atom-atom associations is given by 48- [49]. Similarly, (l,l,2)j processes arise from atom-atom-bond, atom-atom-face interactions (e.g. 50- [51], 52- [53]), whereas (l,2,2)j processes stem from atom-bond-bond, atom-bond-face and atom-face-face interactions (e.g. 54- [55], 56- [57], 58- [59]. Finally, the ternary bond-bond-bond, bond-bond-face, bond-face-face, and face-face-face associations are designated (2,2,2)j as in 60- [61], 62- [63], 64- [65], and 66- [67], respectively. 

Examples of binary associations are exemplified by atom/biplex (l,2j) - 116—[117], and biplex/biplex (2t,2t) - 118—[119]. Similarly, ternary associations atom/atom/biplex (l,l,2t), 

The association of a simple biplex with a topological biplex (2,2t)j is represented by 147- [148]. A variant of the latter, with associative interaction between the two atomic sites of the topological biplex (2,2t)j(l,l)j, is exemplified by 149- [150]. Ternary associations of the type (2,2t)j(l,l)j include termolecular and bimolecular cases 151- [152] and 153- [154], respectively. 

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A junctive site is a reacting atom at which a change in directed bonding occurs. In Figure 8.2 (p. 3), all junctive sites are marked with arrows. A junctive simplex is the smallest portion of a molecule/molecular species that encompasses the reacting atomic sites involved in a junctive process. Jimctive simplexes are of two types - fundamental and topological. Processes are derived from fimdamental simplexes, or topological ones, or both (vide infra). 

A junctive simplex is eithex fundamental (m,rv,p not subscripted) or topological (mt,nt,pt subscript t means a topological simplex). Monoatomic simplexes are always fundamental and are not subscripted. 

Fundamental junctive/disjunctive processes (shown in square parentheses) are derived from fundamental simplexes, and are either simple or complex ... 

In the discussion of junctive simplexes (Chapter 8), we made a distinction between fundamental simplexes and topological simplexes. Here, we note the distinction between molecular and... 

A bijunctive molecule may have two monojunctive atomic sites a tetrajunctive molecule may have two bijunctive simplexes. The j , value of M depends on the process it undergoes. For that molecule, in the specified transformation, j , is the sum of the js/j values of all of its reacting junctive simplexes - fundamental and/or topological - taking part in the transformation (Equation 8.5) ... 

A junctive/disjunctive process may be a composite of both types of simplexes - fundamental and topological. Such a process can be represented by a generalized notation, similar to the ones described above. Figure 8.10 (p. 12) illustrates four representative cases. 

Figure 8.16. Summary of Notations for Fundamental, Composite and Topological Simplexes and Fundamental, Composite and Topological Processes, and, Molecular Junctive/Disjunctive Processes...

Atom junctivity (jj) is not to be confused with (junctive) atomicity (ag). (Junctive) atomicity, ( s), identifies the number of bonding atoms in a simplex - fundamental or topological it determines the notation for the jimctive process (1,1) vs. (1,2). Atom junctivity, (jj), on the other hand, denotes the number of directed bonds being formed at a given junctive atom. 

Fundamental simplex junctivity, jg f is the sum of atom junctivities (ja. ) of all reacting atomic sites in a fundamental simplex s, and is given by Equation 8.2 ... 

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