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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Experimental (IR, Raman) and Computational Analysis of a Series of PtBr_2 Derivatives: Vibrational Coupling in the Coordinated Ethylene and Pt_Br Modes
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Experimental (IR, Raman) and Computational Analysis of a Series of PtBr_2 Derivatives: Vibrational Coupling in the Coordinated Ethylene and Pt_Br Modes

机译:一系列PtBr_2衍生物的实验(红外,拉曼光谱)和计算分析:乙烯和Pt_Br配位模式下的振动耦合

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Compounds (~nBu_4P)[PtBr_3(C_2H_4)] (1), trans-[PtBr_2(NH_2Ph)(C_2H_4)] (2), cis-[PtBr_2(NH_2Ph)(C_2H_4)] (3), (~nPBu_4)_2_[PtBr_4] (4), (~nPBu_4)[PtBr_3(NH_2Ph)] (5), and cis-[PtBr_2(NH_2Ph)_2] (6), as well as the trichlorido analogue of 1, (~nBu_4P)[PtC1_3(C_2H_4)] (1~(c1)), have been investigated experimentally by both IR and Raman spectroscopy, and theoretically by geometry optimization and normal-mode analysis by the DFT approach. An analysis of the normal modes of coordinated ethylene in compounds 1, l~(c1), 2, and 3 followed by a potential energy distribution investigation shows extensive vibrational coupling between the v(C=C) and b_s(CH_2) A_1 modes in two bands at around 1510-1520 and 1230-1250 cm~(-1), the latter one having greater v(C=C) contribution. The p_w(CH_2) A_1 mode, the contribution of which the above two bands is negligible, is responsible for a lower-frequency band at 995-1005 cm~(-1). A complete vibrational analysis, backed up by the DFT calculations, has also been carried out on the Pt-Br stretching vibrations of the tetrabromido complex 4, the tribromido complexes 1 and 5, and the dibromido complexes 2, 3, and 6, and on the Pt-CI vibrations of the analogous complex 1~(c1) The study illustrates the advantages of coupling high-level computations to the vibrational analyses to make unambiguous band assignments in IR and Raman spectroscopy.
机译:化合物(〜nBu_4P)[PtBr_3(C_2H_4)](1),反式[PtBr_2(NH_2Ph)(C_2H_4)](2),顺式[PtBr_2(NH_2Ph)(C_2H_4)](3),(〜nPBu_4)_2_ [PtBr_4](4),(〜nPBu_4)[PtBr_3(NH_2Ph)_2)(5)和顺式[PtBr_2(NH_2Ph)_2](6)以及1的三氯类似物(〜nBu_4P)[PtC1_3 (C_2H_4)](1〜(c1)),已通过IR和拉曼光谱进行了实验研究,并在理论上通过DFT方法通过了几何优化和正模分析进行了研究。分析化合物1,l〜(c1),2和3中的配位乙烯的正态模式,然后进行势能分布研究,结果表明,在1510-1520和1230-1250 cm〜(-1)附近有两个波段,后一个波段具有更大的v(C = C)贡献。 p_w(CH_2)A_1模式对上述两个频带的贡献可忽略不计,是造成995-1005 cm〜(-1)的较低频带的原因。在DFT计算的支持下,还对四溴化合物4,三溴化合物1和5,二溴化合物2、3和6等在Pt-Br拉伸振动上进行了完整的振动分析。类似物1〜(c1)的Pt-CI振动研究表明,将高级计算与振动分析相结合,可以在红外光谱和拉曼光谱学中进行明确的谱带分配。

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