Probing the lowest coordination number of dianionic platinum-cyanide complexes in the gas phase: Dynamics of the charge dissociation process

Probing the lowest coordination number of dianionic platinum-cyanide complexes in the gas phase: Dynamics of the charge dissociation process
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DOI:
10.1063/1.1310610
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发表时间:
2000-10-22
影响因子:
4.4
通讯作者:
Nielsen, SB
Nielsen, SB
中科院分区:
化学2区
文献类型:
--
作者:
Bojesen, G;Hvelplund, P;Nielsen, SB

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利用低能和高能碰撞诱导解离技术研究了气态Pt(CN)(6)(2-)和Pt(CN)(4)(2-)二价阴离子配合物的解离行为,以寻找最小的稳定二价阴离子配合物. Pt(CN)(6)(2-)失去中性分子,生成Pt(CN)(5)(2-)和Pt(CN)(4)(2-),但没有发现Pt(CN)(3)(2-)的存在,这表明Pt(CN)(3)(2-)的寿命小于4 μ s(从碰撞区到探测器的飞行时间)。相比之下,观察到所有单阴离子铂-氰化物配合物,即,Pt(CN)(n)(-)(n=1-6)。在形成单阴离子的过程中释放的动能远低于逆反应的势垒高度(>1.5 eV),这表明涉及电子脱离,例如,Pt(CN)(3)(-)和CN-不是由Pt(CN)(4)(2-)以相同的动力学过程形成的,或者解离过程的动力学是缓慢的。为了比较,Ru(bipy)(3)(2+)*--> [Ru(bipy)(2)-H](+)+bipyH(+)反应与类似于0.3 eV的动力学能量释放有关(bipy= 2,2(')-联吡啶)。(C)2000年美国物理学会。【S0021-9606(00)00240-3】。
Low-energy and high-energy collision induced dissociation techniques are used to study the dissociation behavior of the gaseous Pt(CN)(6)(2-) and Pt(CN)(4)(2-) dianion complexes in order to probe the smallest stable dianion complex. Loss of neutral molecules from Pt(CN)(6)(2-) occurs resulting in Pt(CN)(5)(2-) and Pt(CN)(4)(2-), but no indication of the existence of Pt(CN)(3)(2-) was found. This indicates that the lifetime of Pt(CN)(3)(2-) is less than 4 mus (the flight time from the collision region to the detector). In contrast, all monoanion platinum-cyanide complexes were observed, i.e., Pt(CN)(n)(-) (n=1-6). The kinetic energy released in processes where monoanions are formed is much lower than the barrier height for the reverse reaction (>1.5 eV), which indicates that electron detachment is involved, e.g., Pt(CN)(3)(-) and CN- are not formed in the same dynamical process from Pt(CN)(4)(2-), or that the dynamics of the dissociation process is slow. For comparison, the Ru(bipy)(3)(2+)*--> [Ru(bipy)(2)-H](+)+bipyH(+) reaction is associated with a kinetic-energy release of similar to0.3 eV (bipy=2,2(')-bipyridine). (C) 2000 American Institute of Physics. [S0021-9606(00)00240-3].