| 异多核金属三键(W≡C)有机化合物的红外和拉曼光谱研究 |
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| 引用本文： | 许振华,A Mayr.异多核金属三键(W≡C)有机化合物的红外和拉曼光谱研究[J].光谱学与光谱分析,2000,20(5):702-703. |
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| 作者姓名： | 许振华 A Mayr |
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| 作者单位： | 1. 稀土材料化学与应用国家重点实验室,化学与分子工程学院,北京大学,100871,北京
2. Department of Chemistry,State University of New York,Stony Brook ,New York,11794-3400,USA |
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| 摘 要： | 五种 (Ⅰ ,Ⅱ ,Ⅲ ,Ⅳ ,Ⅴ )异多核金属钨三键W≡C金属有机化合物的红外和拉曼光谱研究表明 ,由于N和P原子为强的σ 给予体和弱的π 接受体 ,在金属原子上分别引入含N或P的功能基团 (TMEDA或DPPE)将降低金属三键 (W≡C)的键强度 ,W≡C伸缩振动νW≡C 波数下降。化合物Ⅲ的压力调制红外和拉曼光谱显示 ,在 2 0kbar压力附近存在一压力诱导相变。低压相区高的压力灵敏度dv/dp(0 75cm-1·kbar-1)和高压相区很低的压力灵敏度 (0 0 8cm-1·kbar-1)指出 ,对W≡C键存在两种压力效应 ,一种是正常的 ,W≡C键强度随压力增加而增强 ,伸缩振动 νW≡C 波数增加 ;另一种是随着压力增加 ,从W到COπ 轨道反馈增加 ,导致W≡C键强度减弱 ,伸缩振动νW≡C 波数下降。
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| 关 键 词： | 红外光谱 拉曼光谱 异多核金属三键有机化合物 |
Infrared and Raman Spectra Studies on Isomultinuclear Organometallic Carbyne Compounds |
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| Zhenhua XU,A Mayr.Infrared and Raman Spectra Studies on Isomultinuclear Organometallic Carbyne Compounds[J].Spectroscopy and Spectral Analysis,2000,20(5):702-703. |
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| Authors: | Zhenhua XU A Mayr |
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| Institution: | State Key Laboratory of Rare Earth Material Chemistry and Applications, Department of Chemistry, Peking University, 100871 Beijing. |
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| Abstract: | The infrared and Raman spectra of five isomultinuclear organometallic carbyne compounds were studied. The results show that the introduction of N atom from TMEDA or P atom from DPPE to W atom (both N and P are strong sigma-donor and weak pi-acceptor) will decrease the bonding intensity of W identical to C. The pressure tunning IR and Raman spectra of compound III indicate the presence of pressure-induced phase-transition near 20 kbar in it. There are two effects on the nu (W identical to C) of this compound with increasing pressure: the normal increasing the nu (W identical to C) wavenumber due to the shorting W identical to C bond and increasing the W-CO pi backbonding to decrease the nu (W identical to C) wavenumber. |
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| Keywords: | Raman spectra Infrared spectra Pressure-ind uced Phase-transition |
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