Hertler Phoebe R, Kautzsch Linus, Touchton Alexander J, Wu Guang, Hayton Trevor W
Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States.
Materials Department and Materials Research Laboratory, University of California, Santa Barbara, Santa Barbara, California 93106, United States.
Inorg Chem. 2022 Jul 4;61(26):9997-10005. doi: 10.1021/acs.inorgchem.2c00865. Epub 2022 Jun 16.
Reaction of FeBr with Li(N═CBu) (0.5 equiv) and Zn (2 equiv) results in the formation of the formally mixed-valent cluster [FeBr(N═CBu)] () in moderate yield. The subsequent reaction of with Na(N═CBu) results in formation of [FeBr(N═CBu)] (), also in moderate yield. Both and were characterized by zero-field Fe Mössbauer spectroscopy, X-ray crystallography, and superconducting quantum interference device magnetometry. Their tetrahedral [Fe] cores feature short Fe-Fe interactions (ca. 2.50 Å). Additionally, both and display = 7 ground states at room temperature and slow magnetic relaxation with zero-field relaxation barriers of = 14.7(4) and 15.6(7) cm, respectively. Moreover, AC magnetic susceptibility measurements were well modeled by assuming an Orbach relaxation process.
FeBr与Li(N═CBu)（0.5当量）和Zn（2当量）反应，以中等产率生成形式上的混合价簇合物[FeBr(N═CBu)]（）。随后，与Na(N═CBu)反应生成[FeBr(N═CBu)]（），产率同样中等。 和 均通过零场Fe穆斯堡尔光谱、X射线晶体学和超导量子干涉装置磁力测定法进行了表征。它们的四面体[Fe]核具有短的Fe-Fe相互作用（约2.50 Å）。此外， 和 在室温下均表现出S = 7基态以及缓慢的磁弛豫，零场弛豫势垒分别为 = 14.7(4)和15.6(7) cm。此外，通过假设奥巴赫弛豫过程，对交流磁化率测量结果进行了很好的拟合。
