School of Material and Chemical Engineering, Qianjiang College, Hangzhou Normal University, Xuelin Street 16, Hangzhou, Zhejiang Province 310036, China.
Dalton Trans. 2019 Feb 19;48(8):2722-2729. doi: 10.1039/c8dt04768e.
Treatment of Cp3Ln (Ln = Yb, Y) with 5-R3-6-R1-2-R2-1H-1,3-benzazaphosphole (HBp) (HBp1 (1a): R1 = H, R2 = 2,4,6-Me3C6H2, R3 = Me; HBp2(1b): R1 = Me, R2 = C6H5, R3 = H; HBp3(1c): R1 = R3 = H, R2 = C6H5) at room temperature gives the crystalline 1 : 1 Lewis acid-base adducts [(η1(p)-HBp)LnCp3] (2a-d) [Ln = Yb: Bp = Bp1 (2a), Bp2 (2b), Bp3 (2c); Ln = Y: Bp2 (2d)] with Ln-P donor bonds in good yields. Heating 2a-c in toluene leads to the liberation of one molecule of CpH to afford the corresponding N-bonded complexes [Cp2YbBp] (Bp = Bp1 (3a), Bp2 (3b), Bp3 (3c)). Interestingly, the P atom of complexes 3a-c can also be further coordinated to another Lewis acid such as Cp3Yb and B(C6F5)3 to give the adducts [Cp2Yb(μ-η1(N):η2(C,C):η1(P)-Bp)YbCp3] (Bp = Bp1 (4a), Bp2 (4b), Bp3 (4c)) and [Cp2Yb(μ-η1(N):η2(C,C):η1(P)-Bp)B(C6F5)3] (Bp = Bp1 (5a), Bp2 (5b), Bp3 (5c)), respectively. The molecular structures of complexes 2a, 4b-4c and 5c are confirmed by X-ray diffraction analysis.
用 5-R3-6-R1-2-R2-1H-1,3-苯并氮杂膦(HBp)(HBp1(1a):R1=H,R2=2,4,6-Me3C6H2,R3=Me;HBp2(1b):R1=Me,R2=C6H5,R3=H;HBp3(1c):R1=R3=H,R2=C6H5)在室温下处理 Cp3Ln(Ln=Yb,Y)可得到结晶的 1:1Lewis 酸碱加合物[(η1(p)-HBp)LnCp3](2a-d)[Ln=Yb:Bp=Bp1(2a),Bp2(2b),Bp3(2c);Ln=Y:Bp2(2d)],具有良好收率的 Ln-P 给体键。将 2a-c 在甲苯中加热导致释放出一个 CpH 分子,得到相应的 N 键合配合物[Cp2YbBp](Bp=Bp1(3a),Bp2(3b),Bp3(3c))。有趣的是,配合物 3a-c 的 P 原子也可以进一步与另一个路易斯酸如 Cp3Yb 和 B(C6F5)3 配位,得到加合物[Cp2Yb(μ-η1(N):η2(C,C):η1(P)-Bp)YbCp3](Bp=Bp1(4a),Bp2(4b),Bp3(4c))和[Cp2Yb(μ-η1(N):η2(C,C):η1(P)-Bp)B(C6F5)3](Bp=Bp1(5a),Bp2(5b),Bp3(5c)))。通过 X 射线衍射分析确认了配合物 2a、4b-4c 和 5c 的分子结构。