Table 2. Coefficients of determination R 2 of the individual correlations to mean bond length for samples statistically significant at 95% confidence intervals (normal font) and at 99% confidence intervals (bold font) from stepwise multiple-regression analysis, and adjusted R 2 values for ion configurations for which two or more potential factors are statistically significant at 95% confidence intervals.
〈IE〉 is the mean ionization energy and 〈χ〉 is the mean electronegativity. Dashes indicate lack of statistical significance.
| Sample size | Distortion | Bonded anion 〈CN〉 | 〈χ〉 of next-nearest-neighbour cation | 〈IE〉 of next-nearest-neighbour cation | Adjusted R 2 | |
|---|---|---|---|---|---|---|
| [6]Ti4+ | 57 | 0.75 | 0.21 | – | – | 0.81 |
| [5]Cu2+ | 22 | 0.65 | 0.19 | – | – | 0.77 |
| [6]Ta5+ | 35 | 0.73 | – | – | −0.01 | 0.77 |
| [6]Zn2+ | 16 | 0.76 | – | – | – | |
| [6]V4+ | 29 | 0.74 | – | – | – | |
| [6]Cu2+ | 29 | 0.63 | 0.24 | – | – | 0.72 |
| [6]Nb5+ | 38 | 0.60 | 0.17 | – | – | 0.71 |
| [6]Mo6+ | 59 | 0.68 | – | – | – | |
| [6]Co2+ | 24 | 0.51 | – | – | −0.14 | 0.66 |
| [6]Mn2+ | 43 | 0.57 | – | – | −0.03 | 0.62 |
| [6]Te6+ | 21 | 0.28 | – | 0.10 | −0.04 | 0.59 |
| [6]Fe3+ | 39 | 0.34 | 0.39 | – | – | 0.59 |
| [6]V5+ | 20 | 0.50 | – | 0.16 | – | 0.56 |
| [12]Ba2+ | 47 | 0.55 | – | – | – | |
| [6]W6+ | 35 | 0.50 | – | – | – | |
| [4]Ga3+ | 27 | – | 0.29 | −0.17 | −0.33 | 0.48 |
| [6]Sb5+ | 19 | 0.45 | – | – | – | |
| [6]Cd2+ | 26 | 0.39 | – | – | – | |
| [9]Ba2+ | 54 | 0.39 | – | – | – | |
| [7]Ca2+ | 30 | 0.28 | – | – | −0.10 | 0.38 |
| [4]Se6+ | 21 | 0.35 | – | – | – | |
| [4]B3+ | 148 | 0.33 | 0.05 | – | – | 0.35 |
| [6]Na+ | 112 | 0.24 | 0.08 | 0.09 | 0.01 | 0.35 |
| [6]Al3+ | 49 | 0.23 | 0.15 | – | – | 0.34 |
| [4]Be2+ | 29 | 0.22 | 0.28 | – | – | 0.34 |
| [9]K+ | 50 | 0.33 | – | – | – | |
| [8]Ca2+ | 53 | 0.32 | – | – | – | |
| [5]Na+ | 25 | 0.32 | – | – | – | |
| [6]Mg2+ | 45 | 0.17 | 0.13 | – | – | 0.32 |
| [6]Li+ | 26 | 0.15 | – | −0.21 | – | 0.30 |
| [4]Zn2+ | 32 | – | – | – | −0.29 | |
| [6]Fe2+ | 28 | 0.27 | – | – | – | |
| [6]Ca2+ | 23 | – | – | – | −0.26 | |
| [6]Ni2+ | 52 | – | 0.22 | 0.00 | – | 0.26 |
| [10]Ba2+ | 56 | 0.02 | – | – | −0.17 | 0.26 |
| [4]Cr6+ | 28 | 0.24 | – | – | – | |
| [7]Na+ | 31 | 0.21 | – | – | – | |
| [4]Li+ | 88 | 0.19 | – | – | – | |
| [4]Al3+ | 58 | – | 0.17 | – | – | |
| [10]K+ | 40 | 0.17 | – | – | – | |
| [8]K+ | 26 | 0.16 | – | – | – | |
| [4]S6+ | 68 | 0.15 | – | – | – | |
| [7]U6+ | 69 | 0.15 | – | – | – | |
| [4]As5+ | 59 | – | – | 0.02 | −0.09 | 0.15 |
| [4]P5+ | 685 | 0.01 | – | −0.01 | −0.07 | 0.14 |
| [3]B3+ | 237 | – | 0.10 | – | – | |
| [4]Mo6+ | 171 | 0.09 | – | – | – | |
| [4]Si4+ | 335 | – | – | – | −0.08 | |
| [3]C4+ | 67 | −0.07 | – | – | – | |
| [4]V5+ | 96 | 0.06 | – | – | – | |
| [3]N5+ | 37 | – | – | – | – | |
| [4]Na+ | 32 | – | – | – | – | |
| [8]Na+ | 42 | – | – | – | – | |
| [12]K+ | 31 | – | – | – | – | |
| [4]Ge4+ | 64 | – | – | – | – | |
| Mean R 2 | 0.35 | 0.19 | 0.00 | −0.12 | ||
| Weighted mean R 2 | 0.16 | 0.04 | 0.00 | −0.03 | ||