FeP(Im)-AB Bonding Energies Evaluated with A Large Number of Density Functionals (P = porphine, Im = imidazole, AB = CO, NO, and O(2)).

FeP(Im)-AB Bonding Energies Evaluated with A Large Number of Density Functionals (P = porphine, Im = imidazole, AB = CO, NO, and O(2)).
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DOI:
10.1080/00268976.2011.609141
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发表时间:
2011-08-20
期刊:
影响因子:
1.7
通讯作者:
Watts JD
Watts JD
中科院分区:
化学4区
文献类型:
--
作者:
Liao MS;Huang MJ;Watts JD

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测试了六十四(64)个密度泛函,范围从GGA、间-GGA、混合GGA到混合间-GGA,以评估血红素模型络合物FeP(Im)(AB)(P =卟吩,Im =咪唑,AB = CO,NO和O2)中的FeP(Im)-AB键能(Ebond)。结果表明,准确预测的Ebond的各种配体血红素是困难的DFT方法,通常一个功能成功的一个系统并没有表现出同样好的其他系统(S)。使用亚GGA函数BLAP 3和Bmτ1获得了各种FeP(Im)-AB键能的相对满意的结果;对于AB = CO、NO和O2,它们分别产生约1.1、1.2和0.4 eV的Ebond值,这与实验数据相当吻合(对于CO为0.78 - 0.85 eV,对于NO为0.99 eV,对于O2为0.44 - 0.53 eV)。其他的泛函对于其中的一个或两个体系表现出不同程度的亏损。在描述的五配位FeP(Im)配合物的自旋态能量的各种泛函的性能也进行了检查。
Sixty-four (64) density functionals, ranging from GGA, meta-GGA, hybrid GGA to hybrid meta-GGA, were tested to evaluate the FeP(Im)-AB bonding energies (Ebond) in the heme model complexes FeP(Im)(AB) (P = porphine, Im = imidazole, AB = CO, NO, and O2). The results indicate that an accurate prediction of Ebond for the various ligands to heme is difficult with the DFT methods; usually a functional successful for one system does not perform equally well for the other system(s). Relatively satisfactory results for the various FeP(Im)-AB bonding energies are obtained with the meta-GGA funtionals BLAP3 and Bmτ1; they yield Ebond values of ca.1.1, 1.2, and 0.4 eV for AB = CO, NO, and O2, respectively, which are in reasonable agreement with experimental data (0.78 – 0.85 eV for CO, 0.99 eV for NO, and 0.44 – 0.53 eV for O2). The other functionals show more or less deficiency for one or two of the systems. The performances of the various functionals in describing the spin-state energetics of the five-coordinate FeP(Im) complex were also examined.
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