II. Empirical relations involving force constants and ionization potentials
| Autor: | Arthur Donald Walsh |
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| Rok vydání: | 1951 |
| Předmět: | |
| Zdroj: | Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences. 207:22-30 |
| ISSN: | 2053-9169 0080-4630 |
| DOI: | 10.1098/rspa.1951.0094 |
| Popis: | The following empirical relations are found. The force constant (k$\_{e}$) of a diatomic hydride is roughly proportional to the square of the first ionization potential of the element forming the hydride. For a fixed element A and for B = F, Cl, Br or I, the plot of k$\_{e}$(A$-$B) versus I(B) is linear. The slope of this line ($\partial $k/$\partial $I) increases with increasing electronegativity of A. Similarly, the plot of k$\_{e}$(A$-$B) versus I(B) is linear when A is a fixed group IV element and B = O, S, Se or Te; and the slope increases with increasing electronegativity of A. If A is a group IV element, B is a group VI element and B$^{\prime}$ is a group VII element of atomic number greater by unity than that of B, k$\_{e}$(A$-$B) is directly proportional to k$\_{e}$(A$-$B$^{\prime}$). The plot of k$\_{e}$(A$-$H) versus I(A) is nearly smooth irrespective of the valency of A, but the plot of k$_{e}$(A$-$O) depends markedly on the group number of A: it falls into a number of roughly straight lines each characteristic of a particular group or subgroup. The slope of these lines ($\partial $k/$\partial $I) changes little from group III to IV but decreases markedly from group IV to V to VI. These relations supply abundant ways in which the force constants of bonds may be predicted. Tentative qualitative explanations are offered for some of them. |
| Databáze: | OpenAIRE |
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