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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >The pressure tunning Raman and IR spectral studies on the multinuclear metal carbyne complexes
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The pressure tunning Raman and IR spectral studies on the multinuclear metal carbyne complexes

机译:多核金属卡宾配合物的压力拉曼光谱和红外光谱研究

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The Raman and infrared (IR) spectra of four tungsten metal carbyne complexes I, II, IV and V [Cl(CO)(2)(L)WdropCC(6)H(4)drop (CdropCC(6)H(4))ndropNdropCdrop](2)M (L = TMEDA, n = 0, M = PdI2 or ReCl(CO)(3); L = DPPE, n = 1, M = PdI2 or ReCl(CO)(3)) were studied at high external pressure. Their pressure-induced phase transitions were observed near 20 kbar (complexes I), 15 kbar (complexes II), 25 kbar (complex IV) and 30 kbar (complex V). The pressure-induced phase transition likely is first order in complex I and the pressure-induced phase transitions of complexes II, IV and V are mostly second order. The pressure sensitivities dnu/dp of nu(WdropC) are high in the low-pressure phase area and very low in the high-pressure phase area due to the pressure strengthening pi back-bonding from metal W to pi* orbital of CdropO in fragment Cl(CO)(2)(L)WdropC. The pressure strengthening metal pi back-bonding from metal Re or Pd to pi* orbital of CdropO or CdropN also happened to both of central metal centers of NCPd(I-2)CN in complex I and NCReCl(CO)(3)CN in complex II. (C) 2004 Elsevier B.V. All rights reserved.
机译:四个钨金属碳炔复合物I,II,IV和V [Cl(CO)(2)(L)WdropCC(6)H(4)drop(CdropCC(6)H(4) )ndropNdropCdrop](2)M(研究了L = TMEDA,n = 0,M = PdI2或ReCl(CO)(3); L = DPPE,n = 1,M = PdI2或ReCl(CO)(3))在高外部压力下。在20 kbar(复合物I),15 kbar(复合物II),25 kbar(复合物IV)和30 kbar(复合物V)附近观察到它们的压力诱导的相变。在复合物I中,压力诱导的相变可能是一阶的,而在复合物II,IV和V中,压力诱导的相变大部分是二阶的。 nu(WdropC)的压敏度dnu / dp在低压相区域较高,而在高压相区域则非常低,这是由于从金属W到片段中CdropO的pi *轨道的压力增强pi背键Cl(CO)(2)(L)WdropC。从金属Re或Pd到CdropO或CdropN的pi *轨道的压力增强金属pi回键也发生在配合物I的NCPd(I-2)CN和NCReCl(CO)(3)CN的两个中心金属中心上复合体II。 (C)2004 Elsevier B.V.保留所有权利。

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