Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States.
J Am Chem Soc. 2018 Jan 24;140(3):908-911. doi: 10.1021/jacs.7b12495. Epub 2018 Jan 9.
The first examples of metallacycles containing rare earth ions bridged by radicals are reported. The molecular triangles [Ln(hfac)(bptz)] (Ln = Dy, Y; hfac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; bptz = 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine) consist of lanthanide ions bridged by bptz radical anion (bptz) ligands. Magnetic susceptibility measurements and CASSCF calculations performed on [Dy(hfac)(bptz)] reveal the presence of antiferromagnetic coupling between the Dy centers and the bptz ligands, with J = -6.62 cm.
报告了首例由自由基桥连的含稀土离子的金属环化合物。分子三角形 [Ln(hfac)(bptz)]（Ln = Dy，Y；hfac = 1,1,1,5,5,5-六氟-2,4-戊二酮；bptz = 3,6-双（2-吡啶基）-1,2,4,5-四嗪）由 bptz 自由基阴离子（bptz）配体桥连的镧系元素离子组成。对 [Dy(hfac)(bptz)] 进行的磁化率测量和 CASSCF 计算表明，Dy 中心与 bptz 配体之间存在反铁磁耦合，J = -6.62 cm。
