摘要
自五羰基铁化合物制备以来，不少人对其成键特性作过研究［１，２］。我们注意到，五羰基铁分子中，平面的Ｆｅ－Ｃ键与轴向的Ｆｅ－Ｃ键相比，其键长要长０．００２７ｎｍ，但该键的键力常数ｋ比轴向Ｆｅ－Ｃ键的大０．１８Ｎ／ｃｍ，键振动频率ν～大２２ｃｍ－１，即平...
; We have found from experimental data that, in the iron pentacarbonyl
molecule, the length of FeC bond in axial is shorter than that in planar, but the bond is weaker;
the bond distances of CO of both planar and axial are equal, while the bond strengths are
different. This is against the traditional view of the shorter the bond is, the stronger the bond
will be. We have got through calculation and research, that the main cause of such difference is
that the effects of the backdonor of Fe atoms electrons to CO bonds in axial and planar are
different. The shorter the FeC bond is, the more effective the backdonor (or transfer) of electrons
is. So that the population between Fe and C in axial are less than those in planar, so the bond
is weaker, and the CO bonds have gained more backdonor electrons than those in planar, thus
the bond is stronger.\=\;
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1999年第3期405-408,共4页
Chinese Journal of Inorganic Chemistry
关键词
五羰基铁
化学键
键能
键强度
五羰基合铁
iron pentacarbonyl\ \ \ property of chemical bond\ \ \ bond
energy E\-\{AB\}\= strength of bond
