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Density functional study of ethylene adsorption on small gold, palladium and gold-palladium binary clusters

机译:乙烯在金,钯和金-钯二元簇上的吸附密度函数研究

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Density functional theory calculations were performed to investigate the structural and energetic properties of chemisorbed Au_n-(C_2H_4)_x and Pd_n-(C_2H_4)_x complexes, with n = 2?4 and x = 1?4. Adsorption in π-bonded mode dominates in Au_n-(C_2H_4)_x species irrespective of x while the di-σ mode can be formed in the most stable Pd_n-(C_2H_4)_x species. The adsorption energy decreases as the number of C_2H_4 molecules increases in Au_n-(C_2H_4)_x with n ≤ 4 and Pd_n-(C_2H_4)_x with n ≤ 3. The adsorption of one C_2H_4 molecule on bimetallic Au/Pd clusters has also been studied. The C_2H_4 molecule prefers binding to Pd atoms in π-bonded configuration on Au/Pd clusters. The net charge transfer and the typical shift in the vibrational frequencies of C_2H_4 have also been determined and discussed.
机译:进行密度泛函理论计算,以研究化学吸附的Au_n-(C_2H_4)_x和Pd_n-(C_2H_4)_x络合物的结构和能量性质,其中n = 2?4和x = 1?4。 Au_n-(C_2H_4)_x物种中,以π键模式吸附最主要,而与x无关,而在最稳定的Pd_n-(C_2H_4)_x物种中可以形成di-σ模式。当n≤4的Au_n-(C_2H_4)_x和n≤3的Pd_n-(C_2H_4)_x中的C_2H_4分子数目增加时,吸附能降低。还研究了一个C_2H_4分子在双金属Au / Pd团簇上的吸附。 C_2H_4分子更喜欢以Au / Pd团簇上的π键结构与Pd原子结合。还确定并讨论了净电荷转移和C_2H_4振动频率的典型位移。

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