Synthesis, Structure Elucidation, and Physical Properties of Naked Guanidinates of Europium and Ytterbium

在最近几年中，我们首次成功地合成和表征了碱金属和碱土金属的固体胍酸盐，它们是含有裸露的阴离子(单或双)去质子胍分子的真正盐。我们现在想将这种方法扩展到稀土金属Eu和Yb，特别是因为这两种金属在液氨中都是可溶的(作为二价Eu和二价/三价Yb)，最终得出与碱金属和碱土金属类似的合成化学。因为我们的合成路线确实允许两种去质子胍阴离子，所以前面提到的胍和Eu/Yb的组合有望实现异常丰富的固态化学。除了新化合物的存在外，我们还对它们的结构特别是Eu(II)和Yb(III)化合物的磁性和光学性质非常感兴趣，特别是因为胍分子中的氮原子与金属配位。

Within the recent years we have succeeded, for the first time ever, to synthesize and characterize solid guanidinates of the alkali and alkaline-earth metals which are true salts containing a naked anionic (singly or doubly) deprotonated guanidine molecule. We would now like to extend this approach to the rare-earth metals europium and ytterbium, in particular because both are soluble (as divalent europium and di-/trivalent ytterbium) in liquid ammonia, to eventually come up with an analogous synthetic chemistry as compared to the alkali and alkaline-earth metals. Because our synthetic route does allow for two sorts of deprotonated guanidinate anions, the aforementioned combination of guanidine and europium/ytterbium promises an exceptionally rich solid-state chemistry. Besides the sheer existence of the new compounds, we are very much interested in their structures and, in particular, in their magnetic and optical properties of the Eu(II) and Yb(III) compounds, especially because of the metal coordination by the nitrogen atoms of the guanidine molecule.