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首页> 外文期刊>Chemical Physics Letters >A computational study of the charge-delocalized and charge-localized forms of the croconate and rhodizonate dianions
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A computational study of the charge-delocalized and charge-localized forms of the croconate and rhodizonate dianions

机译:cronate和rhozonzonate阴离子的电荷离域和电荷局部化形式的计算研究

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摘要

Ab initio and DFT calculations indicate that the charge-localized forms (C-2v symmetry) of croconate (C5O52-) and rhodizonate (C6O62-) dianions cannot exist as a single entity. Instead, this form of the dianions can exist in the presence of counter cation(s) or in hydrogen-bonded networks. For the charge-delocalized (D-5h symmetry) form of C5O52-, it is found that the HF/3-21G(d) and CASSCF(n,m)/3-21G(d) levels of theory yield C-C and C-O bond lengths that are within the experimental range. However, for the D-6h tautomer of C6O62-, all the theoretical methods that have been tried led to optimized C-C bond lengths that are slightly (about 0.02-0.06 Angstrom) too long. (C) 2004 Elsevier B.V. All rights reserved.
机译:从头算和DFT计算表明,croconate(C5O52-)和Rhodizonate(C6O62-)二价阴离子的电荷局部形式(C-2v对称)不能作为单个实体存在。相反,这种形式的二价阴离子可以存在于抗衡阳离子的存在下或存在于氢键网络中。对于C5O52-的电荷离域(D-5h对称性)形式,发现理论上的HF / 3-21G(d)和CASSCF(n,m)/ 3-21G(d)水平产生CC和CO键长度在实验范围内。但是,对于C6062-的D-6h互变异构体,所有已尝试的理论方法都导致优化的C-C键长度过短(约0.02-0.06埃)。 (C)2004 Elsevier B.V.保留所有权利。

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