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linyanglin木蟲(chóng) (著名寫(xiě)手)
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[求助]
請(qǐng)問(wèn)有人知道怎樣計(jì)算配合物基態(tài)的氧化電勢(shì),急用!如果解決了再送50金幣
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The rigorous way to obtain the GSOP (also termed ΔGox) is to compute the free energy difference between the neutral and the oxidized GS species, (G0 - G+)GS.16 The Gibbs free energy in solution of a species i (Gsolv) is defined as Gsolv=Gvac+ ΔGsolv, where Gvac is the Gibbs free energy in gas phase and ΔGsolv is the free energy of solvation. Gvac is obtained by performing a singlepoint calculation at the optimized geometry in vacuo, followed by frequency calculations in order to include the vibrational contribution to the total partition function. ΔGsolv i is obtained by a single-point calculation in solution and a reference calculation in gas phase at the geometry optimized in solution.Geometry optimizations of the neutral and oxidized sensitizers were carried out in gas phase and in acetonitrile, that is the solvent experimentally employed for the electrochemical measures, by using the B3LYP exchange-correlation functional and a 6-31G* basis set. Solvation effects were taken into account by means of the C-PCM solvation model as implemented in Gaussian 03 (G03). We employ the UAHF radii, expressly optimized to reproduce the experimental solvation energy of a series of organic molecules. For the calculation of ΔGox we adopted a 6-31+G* basis set, which includes both diffuse and polarization functions, since in preliminary calculations we found a sizable effect (+0.2-0.3 eV) of the diffuse functions on the computed ΔGox. We tested the performance of different GGA, hybrid GGA and meta-hybrid GGA functionals, also combining different exchange and correlation parts, in order to elucidate the combined effect on the computed ΔGox of the local and nonlocal HF exchange as well as of the correlation functional. 每個(gè)吉布斯自由能是如何得到的,輸入文件的關(guān)鍵詞應(yīng)該怎樣設(shè)置呢,謝謝。 [ Last edited by linyanglin on 2011-6-10 at 20:11 ] |
榮譽(yù)版主 (著名寫(xiě)手)
木蟲(chóng) (著名寫(xiě)手)
榮譽(yù)版主 (著名寫(xiě)手)
木蟲(chóng) (著名寫(xiě)手)
金蟲(chóng) (小有名氣)
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如果用g09的話,應(yīng)該是#p b3lyp/lanl2dz opt freq scrf=(solvent=Ethanol) 這里有一點(diǎn)疑問(wèn),樓主的計(jì)算體系里都有些什么元素,如果全部用Lanl2dz不一定合理。 另外如果要計(jì)算氧化態(tài)的絡(luò)合物的話,樓主只需要改變計(jì)算輸入文件中的電荷和自旋多重度就可以了。這兩個(gè)參數(shù)到底是多少就取決于氧化態(tài)絡(luò)合物整體的帶電量和未成對(duì)電子數(shù)的多少了。 |
木蟲(chóng) (著名寫(xiě)手)
金蟲(chóng) (小有名氣)
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建議對(duì)C,H,O,N,F用6-31G(d0)基組,對(duì)Zn用lanl2dz基組。不知道你這個(gè)是幾價(jià)的Zn。帶電荷數(shù)和自選多重度是從圖上看不出來(lái)的。≡俳o點(diǎn)提示吧,呵呵。 |
木蟲(chóng) (著名寫(xiě)手)
金蟲(chóng) (小有名氣)
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