DFT Study of α-Keggin-type Iso-polyoxotungstate Anions [HnW12O40](8-n)- (n =1-4): Can [H4W12O40]4- Exist?

DFT Study of α-Keggin-type Iso-polyoxotungstate Anions [HnW12O40](8-n)- (n =1-4): Can [H4W12O40]4- Exist?
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α-Keggin型异多钨酸盐阴离子[HnW12O40](8-n)- (n =1-4)的DFT研究:[H4W12O40]4-存在吗?

DOI:
10.1021/acs.inorgchem.1c01962
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发表时间:
2021
影响因子:
4.6
通讯作者:
Nakajima Takahito
Nakajima Takahito
中科院分区:
化学2区
文献类型:
--
作者:
Eda Kazuo;Akune Masahiko;Yasuma Chie;Hotta Hiroki;Osakai Toshiyuki;Nakajima Takahito

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中心空位被质子占据的Keggin型异多钨酸根阴离子[HnW12O40](8-n)-‘S是很有吸引力的材料。揭示空位是否能被四个质子完全占据是很重要的。为了进一步了解这些同位阴离子的形态,用第一原理计算方法(微动弹性带方法、同步过渡导引的准牛顿方法、本征反应坐标方法和频率分析计算)详细研究了H1[hn-1W12O40](8-n)-和[HnW12O40](8-n)-之间的相对稳定性和质子转移反应。并对质子转移过程进行了热化学分析。[HnW12O40](8-n)-比H1[Hn-1W12O40](8-n)-在能量上更稳定。根据热化学分析的结果,质子从H1[H3W12O40]4-到[H4W12O40]4-的转移速率常数和Wigner修正系数分别为3.1×10~(-1)s~(-1)和2.2att=298.15 K,表明当质子化[H3W12O40]5-形成H1[H3W12O40]4-时,[H4W12O40]4-可以存在。
The Keggin-type iso-polyoxotungstate (iso-POT) anions [HnW12O40](8–n)–’s, in which their central vacancies are occupied by protons, are attractive materials. It is of importance to reveal if the vacancies can be fully occupied by four protons. For further understanding the speciation of these iso-POT anions, relative stabilities and proton transfer reactions between H1[Hn–1W12O40](8–n)–and [HnW12O40](8–n)–were examined in detail by using the first-principles calculations (the nudged elastic band method, the synchronous transit-guided quasi-Newton method, the intrinsic reaction coordinate method, and frequency analysis calculations). Thermochemistry analysis of the proton transfer was also performed. [HnW12O40](8–n)–was energetically more stable than H1[Hn–1W12O40](8–n)–. This held forn= 4. According to the results of thermochemistry analysis, the rate constant and the Wigner correction were respectively 3.1 × 101s–1and 2.2 atT= 298.15 K for the proton transfer from H1[H3W12O40]4–to [H4W12O40]4–, indicating that [H4W12O40]4–can exist when H1[H3W12O40]4–is formed by protonating [H3W12O40]5–.
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