The First One-Pot Synthesis of Multinuclear 3d-4f Metal–Organic Compounds Involving a Polytopic N,O-Donor Ligand Formed in Situ

In this work we present 16 new 3d-4f metal-organic comounds,
which are synthesized by a one-pot method with one uncommon polytopic
N,O-donor ligand formed in situ. All these compounds are characterized
by single crystal X-ray diffraction, which reveals isomorphism for
them and a special heterometallic trinuclear structure in a perfect
linear arrangement. Within this trinuclear unit, the metal­(3d)-O-metal­(4f)
angle and metal­(3d)-to-metal­(4f) distance is exceptionally small,
to our best knowledge, which should present the smallest one in the
literature. Moreover, the magnetic properties of partial compounds
are explored, revealing that at high temperature paramagnetic behavior
is observed and the slow decrease is mainly due to a crystal field
effect, at the low temperature antiferromagnetic interaction or magnetic
anisotropy operates.

本研究中，我们展示了16种新型的3d-4f金属有机化合物，这些化合物通过一种一锅法合成，其中包含一种不寻常的多面N,O-供体配体，该配体是在原位形成的。所有这些化合物均通过单晶X射线衍射进行了表征，揭示了它们的同质性和一种独特的异金属三核结构，该结构呈完美的线性排列。在此三核单元内，金属-(3d)-氧-金属-(4f)角以及金属-(3d)-至-金属-(4f)距离特别微小，据我们所知，这可能在文献中是最小的。此外，对部分化合物的磁性质进行了探索，发现高温下观察到顺磁性行为，而缓慢的下降主要是由于晶体场效应，而在低温下，反铁磁性相互作用或磁各向异性起主导作用。