Synthesis of [PdL(NH3)2](PF6)2 (L = 1,1′-di(alkyl)-3,3′-methylenediimidazolin-2,2′-diylidene) complexes and their reactivities towards N-donors
作者:Chao Chen、Wanzhi Chen、Huayu Qiu
DOI:10.1039/c2dt31739g
日期:——
The reaction of neutral palladium complexes PdLBr2 (L = 1,1â²-di(alkyl)-3,3â²-methylenediimidazolin-2,2â²-diylidene) with NH4PF6 in CH3CN afforded [PdL(NH3)2](PF6)2 (1â3, L1, alkyl = Me; L2, alkyl = Et; L3, alkyl = iso-Pr) and [PdL4(CH3CN)2](PF6)2 (4, alkyl = Mes). Treatment of [PdL(NH3)2](PF6)2 complexes with N-donors, 9-ethyl-3,6-diimidazolyl-carbazole (dicz), mercaptopyridine (HSPy), 3,5-dimethyl-1H-pyrazole (Hdmpz), and 1,2-dibenzoylhydrazine (H2dbhz) resulted in the substitution of NH3 forming dinuclear palladium complexes [PdL1(dicz)]2(PF6)4 (5), [PdL1(SPy)]2(PF6)2 (6), [PdL2(dmpz)]2(PF6)2 (7), [(PdL2)2(dbhz)] (8). Reaction of [PdL2(NH3)2](PF6)2 with hydrazine led to a mixture of [Pd(L2)2](PF6)2 (9) and [PdL2(NH2NC(CH3)NHNH2)](PF6)2 (10). The NH2NC(CH3)NHNH2 moiety was formed in situ by nucleophilic addition to CH3CN by two molecules of NH2NH2 and subsequent NH3 elimination. All of these complexes have been fully characterized by ESI-MS, NMR spectroscopy, and elemental analysis. The molecular structures of 1 and 5â10 were also studied by X-ray diffraction analysis.
中性钯络合物 PdLBr2(L = 1,1â²-二(烷基)-3,3â²-亚甲基二咪唑啉-2,2â²-二亚基)与 NH4PF6 在 CH3CN 中反应生成 [PdL(NH3)2](PF6)2 (1â3,L1,烷基 = Me;L2,烷基 = Et;L3,烷基 = iso-Pr)和 [PdL4(CH3CN)2](PF6)2 (4,烷基 = Mes);L2,烷基=Et;L3,烷基=异-Pr)和[PdL4(CH3CN)2](PF6)2(4,烷基=Mes)。将[PdL(NH3)2](PF6)2 复合物与 9-乙基-3,6-二咪唑基咔唑(dicz)、巯基吡啶(HSPy)、3,5-二甲基-1H-吡唑(Hdmpz)和 1、2-dibenzoylhydrazine (H2dbhz) 的反应中,NH3 被取代,形成双核钯配合物 [PdL1(dicz)]2(PF6)4 (5)、[PdL1(Spy)]2(PF6)2 (6)、[PdL2(dmpz)]2(PF6)2 (7)、[(PdL2)2(dbhz)] (8)。PdL2(NH3)2](PF6)2与肼反应生成[Pd(L2)2](PF6)2 (9)和[PdL2(NH2NC(CH3)NHNH2)](PF6)2 (10)的混合物。NH2NC(CH3)NHNH2 分子是通过两分子 NH2NH2 与 CH3CN 的亲核加成以及随后的 NH3 消去而在原位形成的。所有这些复合物都通过 ESI-MS、NMR 光谱和元素分析进行了全面表征。此外,还通过 X 射线衍射分析研究了 1 和 5â10 的分子结构。