Molecular and crystal structures are determined for a series of mixed-ligand mononuclear compounds of lanthanides (Ln) with the 3,6-di(tert-butyl)-1,2-benzoquinone (SQ) anion radical and bidentate nitrogen-containing ligands (L) of the composition [Ln(SQ)3(L)], where Ln is Tb or Dy, L is 2,2′-bipyridine (bipy); Ln is Eu, L is 1,10-phenanthroline (phen) or N,N,N′,N′-tetramethylethylenediamine (tmen). It is confirmed that the introduction of bidentate L significantly increases the stability of lanthanide semiquinolates in both liquid and solid phases.

中文翻译：

---

含氮配体的镧系半喹啉结构

确定了一系列镧系元素 (Ln) 与 3,6-二(叔丁基)-1,2-苯醌 (SQ) 阴离子自由基和双齿含氮配体的混合配体单核化合物的分子和晶体结构（ L)的组合物[Ln(SQ)3(L)]，其中Ln是Tb或Dy，L是2,2'-联吡啶(bipy)；Ln 是 Eu，L 是 1,10-菲咯啉 (phen) 或 N,N,N',N'-四甲基乙二胺 (tmen)。已证实，二齿 L 的引入显着提高了镧系元素半喹啉在液相和固相中的稳定性。