Table 2.
Empirical Trends in Mean Structural Parameters for Members of Redox Series A–Ma
| series | Q/ L/ z | Fe–Qb | Q–Fe–Qc | Fe⋯Feb | Q⋯Qb | Fe4d | Q4d | Fe4Q4d |
|---|---|---|---|---|---|---|---|---|
| A | S2−/ NO+/ 6−,5−,4− | − | + | − | (−) | − | * | − |
| B | S2−/ Cp−/ 4+,5+,6+ | − | + | − | + | − | + | − |
| C | S2−/ [N(SiMe3)2]−/ 2+,3+,4+ | * | − | + | − | + | − | * |
| D | S2−/ [SAr]−/ 1+,2+,3+ | − | − | * | − | * | − | (−) |
| E | S2−/ Cl−/ 1+,2+ | − | − | − | − | − | − | − |
| F | S2−/ [SH]−/ 1+,2+ | − | − | (+) | − | (+) | − | − |
| G | S2−/ [SAlk]−/ 1+,2+ | − | − | − | − | − | − | − |
| H | S2−/ [CN]−/ 0,1+ | − | − | + | − | + | − | − |
| I | S2−/ [dtc]−/ 2+,3+ | − | − | + | − | + | − | (+) |
| J | Se2−/ [SAlk]−/ 1+,2+ | − | − | − | − | − | − | − |
| K | Se2−/ [SAr]−/ 1+,2+ | − | − | + | − | + | − | − |
| L | Te2−/ PR3/ 0,1+ | − | − | (−) | − | (−) | − | − |
| M | [NtBu]2−/ Cl−/ 3+,4+ | − | − | (−) | − | (−) | − | − |
a
Plus or minus signs: parameter increases or decreases, respectively, with increasing core charge z; parentheses: weak trends (changes of less than 0.005 Å in d istance and 0.01 Å3 in volume); *: no clear trend.
b
Distance
c
Angle
d
Volume.