Formulae semicolons

For more complicated cases an extended notation can be used, in which the coordination of an atom is expressed in the manner A. For m, n and p the polyhedra symbols are taken. Symbols before the semicolon refer to polyhedra spanned by the atoms B, C..., in the sequence as in the chemical formula AaBbCc. The symbol after the semicolon refers to the coordination of the atom in question with atoms of the same kind. For example per-ovskite ... 

Note that by counting the number of colons in a sequence between semicolons, in formula (63) one can determine whether a given atom in the canonical name is at the secondary vs. tertiary vs. etc. levels. 

Another arena in which topologically restrained molecules are of importance involves endothelial compounds for example, a small molecule or ion inside a fisular cage, such as a fullerene. The first of these to be discovered occurred when Diedrich et al. [5] doped C60 with potassium to encapsulate 3 potassium atoms inside the cage. The systemic name for this compound would now be formed by augmenting the name for fullerene that had been developed earlier in Formulas (42) or (43) of Chapter 3 with a semicolon, followed by a zero numbered locant branch e.g., °(K,K,K) — assuming that the three potassium atoms are independent of one another i.e.,... 

It should be noted that in formulas like M(H PA)+ the H+ and PA2-are separated by a semicolon to facilitate reading, yet they appear within the same parentheses to indicate that the proton is at the ligand without defining its location. 

The specific values L-i, etc. of linkedness and/or s of connectedness of a subunit are written within Japeinese brackets eis trailing superscripts to its central atom, by anabgy with the coordination symbols. The first entries in the Japanese brackets are the different values of L, separated from the value of s by a semicolon. The general formula for a structural unit with only one kind of subunit then reads... 

Thus, aU hyphens in the table are true parts of the names. The symbols > and < placed next to an element symbol both denote two single bonds connecting the atom in question to two other atoms. For a given compound, the various systematic names, if applicable, are given in the order stoichiometric names, substitutive names, additive names and hydrogen names. Acceptable names that are not entirely systematic (or not formed according to any of the systems mentioned above) are given at the end after a semicolon. No order of preference is implied by the order in which formulae and names are listed. Reprinted by permission of lUPAC. 

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