symmetry. The complexes are black, mauve, or green. Differences in the energies of f–d transitions are explained in terms of nephelauxetic effects. Similar changes have been observed in the energies of bands observed at shorter wavelengths, which are assigned to metal ion-to-ligand electron transfer. The spectra of NNN′N′-tetramethyldiamide and corresponding NNN′N′-tetraethyldiamide complexes are not noticeably
铀(III)与酰胺Me 2 N·CO·[CH 2 ] n ·CO·NMe 2和Me 2 N·CO·CH 2 ·CMe 2 ·CH 2 ·CO·NMe 2 [系列(I; n = 1-4)]和Et 2 N·CO·[CH 2 ] n ·CO·NEt 2和Et 2 N·CO·CH 2 ·CMe 2 ·CH 2 ·CO·NEt 2 [系列(II; n = 1-4)]使用[BPh 4 ] –或[PF6 ] –作为抗衡阴离子。红外光谱结果表明,
配体中的氧原子相互作用,阴离子不参与配位,导致UO 8发色团的对称性低。复合物是黑色,淡紫色或绿色。f - d跃迁能量的差异是用
肾上腺素作用来解释的。在较短波长下观察到的谱带的能量中也观察到了类似的变化,这些谱带的能量与
金属离子到
配体的电子转移有关。的光谱NNN ' Ñ '-tetramethyldiamide和对应NNN ' Ñ' -四乙基二酰胺络合物没有显着差