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Formation and Structures of Transition Metal-C_(60) Clusters

机译:过渡金属-C_(60)团簇的形成与结构

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摘要

Transition metal (Sc, Ti, V, and Cr)-C_(60) binary clusters were produced in the gas phase by a two-laser vaporization method. In the mass spectra of cationic M_n(C_(60))_m~+, for M = Sc, ti, and V, clusters having the composition of (n, m) = (1, 1)~+, (1, 2)~+, (2, 3)~+, (3, 4)~+, (4, 4)~+, and (5, 5)~+ were predominantly produced. The peaks having (n, n + 1)~+ compositions are explicable in terms of multiple dumbbell structures, in which metal atoms and C_(60) are alternately stacked. Clusters with composition (4, 4)~+ and (5, 5)~+ are presumed to be ring structures. For Cr_n(C_(60))_m~+, however, a Cr atom is surrounded by three C_(60), forming a tricapped structure, and the structure acts as a unit for larger stable clusters of (2, 4)~+, (3, 4)~+, and (4, 4)~+. Ionization energy measurements for neutral M_n(C_(60))_m and a chemical probe method using CO, O_2, and C_2H_4 as reactants gave information concerning the geometrical and electronic structures.
机译:通过两激光汽化法在气相中生成过渡金属(Sc,Ti,V和Cr)-C_(60)二元簇。在阳离子M_n(C_(60))_ m〜+的质谱图中,对于M = Sc,ti和V,组成为(n,m)=(1,1)〜+,(1,2)的簇主要产生)〜+,(2、3)〜+,(3、4)〜+,(4、4)〜+和(5、5)〜+。具有(n,n + 1)〜+组成的峰可解释为多个哑铃结构,其中金属原子和C_(60)交替堆叠。组成为(4,4)〜+和(5,5)〜+的簇被认为是环状结构。但是,对于Cr_n(C_(60))_ m〜+,Cr原子被三个C_(60)包围,形成一个三键结构,并且该结构充当(2,4)〜+的较大稳定簇的单元,(3,4)〜+和(4,4)〜+。中性M_n(C_(60))_ m的电离能测量以及使用CO,O_2和C_2H_4作为反应物的化学探针方法给出了有关几何和电子结构的信息。

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