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

近年来，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盐，它们是含有裸阴离子（单或双）去质子化胍分子的真盐。我们现在想将这种方法扩展到稀土金属铕和镱，特别是因为两者都可溶于液氨（作为二价铕和二价/三价镱），最终提出与碱金属和碱土金属相比类似的合成化学。因为我们的合成路线确实允许两种去质子化的胍基阴离子，所以上述胍和铕/镱的组合保证了异常丰富的固态化学。除了新化合物的纯粹存在之外，我们对它们的结构，特别是Eu（II）和Yb（III）化合物的磁性和光学性质非常感兴趣，特别是因为胍分子的氮原子的金属配位。

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.