Palladium(<scp>ii</scp>) complexes supported by PBP and POCOP pincer ligands: a comparison of their structure, properties and catalytic activity
作者:Yazhou Ding、Qiang-Qiang Ma、Jiaxin Kang、Jie Zhang、Shujun Li、Xuenian Chen
DOI:10.1039/c9dt03954f
日期:——
diffraction analysis indicated that the Pd centre is less tightly chelated in PBP pincer complexes. The strong σ-donor ability of the PBP pincer ligand has little influence on the structure of the covalent ligand possessing both σ-donor and π-acceptor properties. However, the stretching vibrational frequencies of CS, CSe and N3 ligands and the coordination mode of the BH4 ligand are significantly different in
合成了由Yamashita-Nozaki PBP钳形配体[C 6 H 4 -1,2-(NCH 2 P t Bu 2)2 B] PdCl(1a)支撑的Pd(II)氯化物络合物。将配合物1a的结构,性质和催化活性与相应的POCOP钳形配合物[C 6 H 3 -2,6-(OP t Bu 2)2 ] PdCl(2a)进行了比较。发现配合物1a中的Pd中心比配合物2a中的Pd中心更富电子,更容易被氧化; 配合物1a比配合物2a对铃木-宫浦交叉偶联反应的催化作用要好得多。从配合物1a和2a开始,带有SH,BH 4,CS,CSe或N 3共价配体[C 6 H 4 -1,2-(NCH 2 P t Bu 2)的两个Pd(II)钳形配合物系列。2 B] PdY(Y = SH,1b ; BH 4 ; 1c ; CS,1d ; CSe,1e ;和N 3,1F)和[C 6 H ^ 3 -2,6-(OP吨卜2)2 ] PDY(Y