| Autor: |
Zhu Y; Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States., Mahoney J; Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States., Babson AJ; Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States., Zhou Z; Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States.; Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China., Wei Z; Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States., Gakiya-Teruya M; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States., McNeely J; Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States., Rogachev AY; Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616, United States., Shatruk M; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States., Petrukhina MA; Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States. |
| Abstrakt: |
A family of rare-earth complexes [RE(III) = Y, La, Gd, Tb, Dy, and Er] with doubly reduced dibenzo[ a , e ]cyclooctatetraene (DBCOT) has been synthesized and structurally characterized. X-ray diffraction analysis confirms that all products of the [RE(DBCOT)(THF) 4 ][RE(DBCOT) 2 ] composition consist of the anionic sandwich [RE(DBCOT) 2 ] - and the cationic counterpart [RE(DBCOT)(THF) 4 ] + . Within the sandwich, two elongated π decks are slightly bent toward the metal center (avg. 7.3°) with a rotation angle of 35.9-37.6°. The RE(III) ion is entrapped between the central eight-membered rings of DBCOT 2- in a η 8 fashion. The trends in the RE-COT bond lengths are consistent with the variations of the ionic radii of RE(III) centers. The 1 H NMR spectra of the diamagnetic Y(III) and La(III) analogues illustrate the distinct solution behavior for the cationic and anionic parts in this series. Magnetic measurements for the Dy analogue reveal single-molecule magnetism, which was rationalized by considering the effect of crystal-field splitting for both building units analyzed by electronic structure calculations. |
