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研究了金属钨三键多核金属有机配合物 [Cl(CO) 2 (DPPE)WCC6 H4CCC6 H4NC]2 ReCl(CO) 3(DPPE =bis(diphenylphosphino)ethane,(Ph) 2 PCH2 CH2 P(Ph) 2 )不同压力下的拉曼和红外光谱 (最高压力约 5 0kbar)。配合物在 3 0kbar存在一压力诱导二级相变。金属钨三键伸缩振动ν(WC)压力相关 (dν/dp)在低压相区 ( 0 5 9cm-1·(kbar) -1)与高压相区 ( 0 0 4cm-1·(kbar) -1)差别很大 (约 15倍 )。在高压下 ,从基团Cl(CO) 2 (DPPE)WC中的金属钨W向COπ 轨道的π 反馈明显增强 ,WC的键强度减弱 ,力常数减小和ν(WC)降低 ;此效应与压力缩短WC键 ,增大力常数和增加ν(WC)的效应互相竞争。
In this paper, the effects of the molecular weight distribution of tungsten (W) and its coordination number on the crystal structure of (Cu (OH) 2) Raman and IR spectra at different pressures (up to about 50 kbar). The complex exists a pressure-induced secondary transformation at 30kbar. (WC) pressure dependence (dν / dp) of the Tungsten triple bond in the low pressure region (0 59 cm-1 · (kbar) -1) ) Is very different (about 15 times). At high pressure, the π feedback from the metal tungsten W in the group Cl (CO) 2 (DPPE) WC to the COπ orbitals is significantly enhanced, the bond strength of WC weakens, the force constant decreases and ν (WC) decreases; Pressure shortens the WC bond, increases the force constant and increases the effect of ν (WC) competing against each other.