Table 1. Selected bond lengths (Å) and angles (°) of the previously reported [Cs{(LO)3U}2(μ-N)], [Cs]-1,8g along with [NBu4][{(LO)3U}2(μ-N)], [NBu4]-1, [Na(dme)3][(LN)3U(μ-N)U(LN)2(LO)], 5, [NBu4][{(LN)3U}2(μ-N)], 2, and [{(LN)3U}2(μ-N)], 4, ordered by the number of amide ligands. Complex [Na(dme)2(tmeda)]-3 was also added for comparison.
| Complex | [Cs]-1 | [NBu4]-1 | 5 | [Na(dme)2(tmeda)]-3 (ref. 8f) | 2 | 4 |
| U–Nnitride | 2.058(5), 2.079(5) | 2.032(2), 2.067(2) | 2.055(4), 2.066(4) | 1.95(1), 2.12(1) | 2.076(5), 2.083(5), 2.075(2) | 2.080(5), 2.150(5) |
| U–(Osiloxide)avg | 2.19(1) | 2.2(1) | 2.208(4) | — | — | — |
| U–(Namide)avg | — | — | 2.35(1) | 2.35(1) | 2.35(1) | 2.274(5) |
| U–N–U a | 170.3(3) | 172.2(2), 174(1), 177(1) | 168.4(3) | 123.5(5) | 179(1) | 179.4(3) |
| Twist angle b | 24(11) | 6(2) | 15(1) | — | 1.7(4) | 18(1) |
aTaken as an average of 1.5 molecules in the unit cell of [NBu4][{(LN)3U}2(μ-N)], 2.
bDefined as the average angle between the two closest adjacent planes defined by Nnitride, U, and Osiloxide or Namide atoms.