作者:Gabriele Albertin、Stefano Antoniutti、Emilio Bordignon、Federica Menegazzo
DOI:10.1039/a909404k
日期:——
Hydride complexes IrHCl2[PPh(OEt)2]L21, 3 and IrHCl2[P(OEt)3]L22, 4 (L = PPh3 or AsPh3) were prepared by substituting one phosphine or arsine ligand in IrHCl2L3 with the appropriate phosphite. Treatment of hydrides 1–4 first with triflic acid (CF3SO3H) and then with hydrazines gave [IrCl2(RNHNH2)PPh(OEt)2}L2]BPh45, 7 and [IrCl2(RNHNH2)P(OEt)3}L2]BPh46, 8 (R = H, Me, Ph or C6H4NO2-4). Hydride–hydrazine complexes [IrH2(RNHNH2)(PPh3)3]BPh49 and [IrHCl(RNHNH2)(PPh3)2]BPh410 (R = H, Me or Ph) were also prepared by allowing IrH3(PPh3)3 or IrH2Cl(PPh3)3 to react sequentially first with CF3SO3H or HBF4·Et2O and then with the appropriate hydrazine. All complexes were fully characterised by IR and NMR spectroscopy and their geometry in solution was also established. Oxidation with Pb(OAc)4 at −30 °C of arylhydrazines [IrCl2(ArNHNH2)L′L2]BPh45–8 [L′ = PPh(OEt)2 or P(OEt)3; Ar = Ph] afforded stable aryldiazene derivatives [IrCl2(ArNNH)PPh(OEt)2}L2]BPh411, 13 and [IrCl2(ArNNH)P(OEt)3}L2]BPh412, 14. By contrast, treatment with Pb(OAc)4 at −30 °C of methylhydrazine complexes [IrCl2(MeNHNH2)L′L2]BPh4 gave hydrides IrHCl2L′L2. Aryldiazene complexes [IrCl2(ArNNH)L′L2]BPh411–14 and [IrCl2L′L2}2(μ-HNNAr–ArNNH)](BPh4)215–18 [Ar = Ph or C6H4Me-4; Ar–Ar = 4,4′-C6H4–C6H4 or 4,4′-(2-Me)C6H3–C6H3(Me-2)] were also prepared by allowing hydride species IrHCl2L′L21–4 to react with the appropriate aryldiazonium cations in acetone at −80 °C. Their characterisation by IR and NMR spectroscopy (with 15N isotopic substitution) is discussed.
这项研究描述了一系列铱配合物的合成和表征:
1. 通过在IrHCl2L3中用适当的亚磷酸酯替换一个膦或砷配体,制备了氢化物配合物IrHCl2[PPh(OEt)2]L21,3和IrHCl2[P(OEt)3]L22,4 (L = PPh3或AsPh3)。
2. 将氢化物1-4先后与三氟甲磺酸(CF3SO3H)和肼反应,得到[IrCl2(RNHNH2)PPh(OEt)2}L2]BPh45,7和[IrCl2(RNHNH2)P(OEt)3}L2]BPh46,8 (R = H, Me, Ph或C6H4NO2-4)。
3. 通过让IrH3(PPh3)3或IrH2Cl(PPh3)3依次与CF3SO3H或HBF4·Et2O,然后与适当的肼反应,也制备了氢化物-肼配合物[IrH2(RNHNH2)(PPh3)3]BPh49和[IrHCl(RNHNH2)(PPh3)2]BPh410。
4. 在-30°C下用Pb(OAc)4氧化芳基肼配合物得到稳定的芳基重氮衍生物。
5. 相比之下,甲基肼配合物在相同条件下得到氢化物IrHCl2L′L2。
6. 还通过让氢化物配合物与相应的重氮盐在-80°C丙酮中反应,制备了芳基重氮配合物和双核配合物。
所有配合物都通过IR和NMR光谱进行了完整表征,并确定了它们在溶液中的构型。