Synthesis, X-ray structure and spin crossover in the triple-decker complex [(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)Cr(µ<sup>2</sup>:η<sup>5</sup>-P<sub>5</sub>)Cr(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)]<sup>+</sup>[A]<sup>–</sup>(A = PF<sub>6</sub>, SbF<sub>6</sub>)
作者:Andrew K. Hughes、Vincent J. Murphy、Dermot O'Hare
DOI:10.1039/c39940000163
日期:——
The triple-decker chromium complexes [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)]+[A]â(A = PF6, SbF6) can be prepared in high yield by oxidation of [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)] with either [Fe(η5-C5H5)2]+[A]â(A = PF6, SbF6); the single crystal X-ray structure determination for [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)]+[SbF6]â reveals that the CrâCr separation is 3.185(8)Ã
which is 0.456 Ã
longer than in the neutral complex; magnetic susceptibility studies show that these 26-electron multidecker cations in these salts undergo spin crossover at 33 and 23 K respectively.
三层铬复合物 [(η5-C5Me5)Cr(μ2:η5-P5)Cr(η5-C5Me5)]+[A]⁻(A = PF6, SbF6) 可以通过氧化 [(η5-C5Me5)Cr(μ2:η5-P5)Cr(η5-C5Me5)] 与 [Fe(η5-C5H5)2]+[A]⁻(A = PF6, SbF6) 以高产率制备;单晶X射线结构测定 [(η5-C5Me5)Cr(μ2:η5-P5)Cr(η5-C5Me5)]+[SbF6]⁻ 显示 Cr-Cr 距离为 3.185(8) Å,比中性复合物长 0.456 Å;磁化率研究表明这些含有 26 电子的多层阳离子在这些盐中分别在 33 和 23 K 发生自旋交叉。