Carbene complexes. Part 12. Electron-rich olefin-derived neutral mono- and bis-(carbene) complexes of low-oxidation-state manganese, iron, cobalt, nickel, and ruthenium
作者:Michael F. Lappert、Peter L. Pye
DOI:10.1039/dt9770002172
日期:——
range of co-ordination numbers, formal metal oxidation states, and geometries (tetrahedral, square planar, trigonal bipyramidal, or octahedral) of the complexes. Amongst the 29 new complexes are the novel neutral bis(carbene) specres [Fe(LMe)2(NO)2], [Co(CO)(LEt)2(NO)], trans-[Fe(CO)3(LMe)2], [Ni(CO)2(LEt)2], [Fe(CO)2l2(LMe)2], and [Ni(LMe)2(NO3)2]; the last is the only diamagnetic nickel(II) dinitrate
富含电子的烯烃[:R] 2(L R 2; R = Me或Et)提供了各种热稳定的Fe,Ru,Co, ,镍和锰I,难度更大。值得注意的是配合物的配位数,形式的金属氧化态和几何形状(四面体,正方形平面,三角双锥体或八面体)的范围。在这29种新络合物中,有新型中性双(卡宾)物种[Fe(L Me)2(NO)2 ],[Co(CO)(L Et)2(NO)],反式-[Fe(CO)3(我)2],[Ni(CO)2(L Et)2 ],[Fe(CO)2 l 2(L Me)2 ]和[Ni(L Me)2(NO 3)2 ];最后是唯一的反磁性镍(II)硝酸盐。红外光谱显示,与类似的(例如膦)配合物相比,ν(CO)较低:ν(CN 2)在1 480-1 540 cm - 1范围内,上端是高氧化态金属配合物的特征。在13中也观察到了这种趋势当C carb时,C nmr化学位移。移向更高的场(碳碳水化合物通常是距SiMe 4低场200–230