Reactivity of tri- and tetra-nuclear ethylidyne cyclopentadienylcobalt clusters towards protonic acids
作者:Hubert Wadepohl、Hans Pritzkow
DOI:10.1016/0022-328x(93)80130-4
日期:1993.5
The bis(μ3-ethylidyne) tricobalt cluster [(CpCo)3(μ3-CCH3)2] (1b) is protonated by trifluoroacetic acid to give the dicobalt edge-protonated cation [H(CpCo)3(μ3-CCH3)2]+ [lb + H]+. Protonation of the μ3-ethylidyne tetracobalt cluster hydride [H(CpCo)4(μ3-CCH3)] (3) takes place in two consecutive steps. At low temperature [H2(CpCo)4(μ3-CCH3)]+ [3 + H]+ is formed first, and is then slowly converted into
(μ双3 -ethylidyne)三钴簇[(CpCo)3(μ 3 -CCH 3)2 ](图1b)由三氟乙酸质子化,得到二钴边缘质子化的阳离子[H(CpCo)3(μ 3 - CCH 3)2 ] + [ lb + H] +。的质子化的μ 3 -ethylidyne tetracobalt簇氢化物[H(CpCo)4(μ 3 -CCH 3)](3)发生在两个连续的步骤进行。在低温下[H 2(CpCo)4(μ 3 -CCH 3)] + [ 3 + H] +,首先形成,然后慢慢地转化为[H 3(CpCo)4(μ 3 -CCH 3)] 2+ [ 3 + 2H] 2+通过过量的酸。作为判断的1个H NMR数据和的晶体结构[ 3 + X] + [(CF 3 COO)2 X] -(XH或d)所述内切在氢[ 3 + H] +和[ 3 + 2H]2+占据μ 3 - (CO 3)面封盖氢负离子的位置。阳离子[ 1b