Mononuclear and dinuclear palladium and nickel complexes of phosphinimine-based tridentate ligands
作者:Renan Cariou、Fatme Dahcheh、Todd W. Graham、Douglas W. Stephan
DOI:10.1039/c1dt10131e
日期:——
The tridentate bis-phosphinimine ligands O(1,2-C6H4NPPh3)21, HN(1,2-C2H4NPR3)2 (R = Ph 2, iPr 3), MeN(1,2-C2H4NPPh3)24 and HN(1,2-C6H4NPPh3)25 were prepared. Employing these ligands, monometallic Pd and Ni complexes O(1,2-C6H4NPPh3)2PdCl26, RN(1,2-CH2CH2NPPh3)2PdCl][Cl] (R = H 7, Me 8), [HN(1,2-CH2CH2NPiPr3)2PdCl][Cl] 9, [MeN(1,2-CH2CH2NPPh3)2PdCl][PF6] 10, [HN(1,2-CH2CH2NPPh3)2NiCl2] 11, [HN(1,2-CH2CH2NPR3)2NiCl][X] (X = Cl, R = iPr 12, X = PF6, R = Ph 13, iPr 14), and [HN(1,2-C6H4NPPh3)2Ni(MeCN)2][BF4]Cl 15 were prepared and characterized. While the ether-bis-phosphinimine ligand 1 acts in a bidentate fashion to Pd, the amine-bis-phosphinimine ligands 2–5 act in a tridentate fashion, yielding monometallic complexes of varying geometries. In contrast, initial reaction of the amine-bis-phosphinimine ligands with base followed by treatment with NiCl2(DME), afforded the amide-bridged bimetallic complexes N(1,2-CH2CH2NPR3)2Ni2Cl3 (R = Ph 16, iPr 17) and N(1,2-C6H4NPPh3)2Ni2Cl318. The precise nature of a number of these complexes were crystallographically characterized.
制备了三叉双膦亚胺配体 O(1,2-C6H4NPPh3)21、HN(1,2-C2H4NPR3)2(R = Ph 2,iPr 3)、MeN(1,2-C2H4NPPh3)24 和 HN(1,2-C6H4NPPh3)25。利用这些配体,制备了单金属钯和镍配合物 O(1,2-C6H4NPPh3)2PdCl26、RN(1,2-CH2CH2NPPh3)2PdCl][Cl](R = H 7、Me 8)、[HN(1,2-CH2CH2NPiPr3)2PdCl][Cl]9、[MeN(1,2-CH2CH2NPPh3)2PdCl][PF6]10、制备并表征了[HN(1,2-CH2CH2NPPh3)2NiCl2]11、[HN(1,2-CH2CH2NPR3)2NiCl][X](X = Cl,R = iPr 12,X = PF6,R = Ph 13,iPr 14)和[HN(1,2-C6H4NPPh3)2Ni(MeCN)2][BF4]Cl 15。醚-双膦酰亚胺配体 1 与钯的作用方式为双齿式,而胺-双膦酰亚胺配体 2-5 的作用方式为三齿式,从而产生了不同几何形状的单金属配合物。相反,胺双膦酰亚胺配体与碱发生初始反应,然后用氯化镍(二甲醚)处理,可得到酰胺桥双金属配合物 N(1,2-CH2CH2NPR3)2Ni2Cl3(R = Ph 16, iPr 17)和 N(1,2-C6H4NPPh3)2Ni2Cl318。这些复合物的精确性质已通过晶体学鉴定。