A reaction of trans-[Ir(H)5(PiPr3)2] (1) with 2,3,5,6-tetrafluoropyridine, pentafluorobenzene or 1,3-difluorobenzene in the presence of neohexene affords the square-pyramidal CâH activation products cisâtrans-[Ir(4-C5NF4)(H)2(PiPr3)2] (2), cisâtrans-[Ir(C6F5)(H)2(PiPr3)2] (4) and cisâtrans-[Ir(2-C6H3F2)(H)2(PiPr3)2] (6). Irradiation of complex 1 with 2,3,5,6-tetrafluoropyridine or pentafluorobenzene gave the hydrides cisâtrans-[Ir(4-C5NF4)(H)2(H2)(PiPr3)2] (3) or cisâtrans-[Ir(C6F5)(H)2(H2)(PiPr3)2] (5). The presence of non-classical bound H2 moieties has been demonstrated by the measurement of T1 times at different temperatures. For 3 the HâH distance in the H2 ligand can be estimated to be 0.82 Ã
. The dihydride compounds 2, 4 and 6 react with CO to yield the complexes cisâtrans-[Ir(Ar)(H)2(CO)(PiPr3)2] (7: Ar = 4-C5NF4, 8: Ar = C6F5, 9: Ar = 2-C6H3F2). A reaction of 2 or 3 with an excess of ethylene leads to the formation of ethane and the Ir(I) ethylene complex trans-[Ir(4-C5NF4)(η2-C2H4)(PiPr3)2] (10). Treatment of 10 with CO furnishes the Ir(I) complex trans-[Ir(4-C5NF4)(CO)(PiPr3)2] (11).
反式-[Ir(H)5(PiPr3)2] (1) 与 2,3,5,6-四
氟吡啶、
五氟苯或
1,3-二氟苯在
新己烯存在下反应,得到方锥体 C– H 活化产物顺反式-[Ir(4-C5NF4)(H)2(PiPr3)2] (2),顺反式-[Ir(
C6F5)(H)2(PiPr3)2] (4)和顺反式-[Ir(2-
C6H3F2)(H)2(PiPr3)2] (6)。用 2,3,5,6-四
氟吡啶或
五氟苯照射配合物 1,得到
氢化物顺式反式-[Ir(4-C5NF4)(H)2(H2)(PiPr3)2] (3) 或顺式反式-[Ir( )(H)2(H2)(PiPr3)2] (5)。通过在不同温度下测量 T1 时间已证明非经典结合 H2 部分的存在。对于 3,H2
配体中的 H→H 距离可估计为 0.82 ×。二氢化合物 2、4 和 6 与 CO 反应生成配合物 cis-trans-[Ir(Ar)(H)2(CO)(PiPr3)2] (7: Ar = 4-C5NF4, 8: Ar = , 9: Ar = 2- )。 2 或 3 与过量
乙烯的反应导致形成
乙烷和 Ir(I)
乙烯配合物反式-[Ir(4-C5NF4)(β2-
C2H4)(PiPr3)2] (10)。用 CO 处理 10 得到 Ir(I) 络合物反式-[Ir(4-C5NF4)(CO)(PiPr3)2] (11)。