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dson至尊木蟲 (著名寫手)
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[求助]
計算0基礎(chǔ)菜鳥求助:優(yōu)化過渡態(tài)結(jié)構(gòu)并得到過渡態(tài)數(shù)據(jù)
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各位大俠,小弟理論計算方面之前沒有接觸過,現(xiàn)在有如下三個底物:甲醇、己內(nèi)酯、二苯磷酸酯三個底物,可能存在的過渡態(tài)分別為TS1 TS2(對應(yīng)兩種不同的反應(yīng)機理,(第二張有氫鍵長度的圖是文獻中的截圖),現(xiàn)在我想知道算出第二幅圖中過渡態(tài)數(shù)據(jù)的方法。 文獻方法如下(看得云里霧里,想知道具體步驟):Calculations were carried out with the Gaussian 03 suite of programs at the DFT level of theory using the hybrid functional B3PW91. Sulfur, nitrogen, carbon, oxygen and hydrogen atoms were described with a 6-31G(d,p) double-z basis set. Phosphorus and fluorine atoms were treated with a Stuttgart–Dresden pseudopotential in combination with its adapted basis set augmented by a set of polarization function d. Geometry optimizations were carried out without any symmetry restrictions, and the nature of the extrema was verified with analytical frequency calculations. The intrinsic reaction coordinate was followed using the IRC technique for all located transition states. The reference energy has been set to zero for the most stable ternary adduct of reactants. 第一個問題:通過看網(wǎng)上論壇以及文獻里的提示,在Gaussian計算前需要在chem3D中對結(jié)構(gòu)先進行優(yōu)化,那么請問是用哪個方法?MM2,還是mopac,或是其他在chem3D中的優(yōu)化結(jié)構(gòu)方法? 第二個問題 chem3D中算出的氫鍵長度可不可靠(和文獻報道有較大差異)?Gaussian 09或者Gauss view中可以做氫鍵長度計算嗎?怎么搞捏? 第三個問題 優(yōu)化好結(jié)構(gòu)后在Gaussian中用DFT作TS的計算(文獻有方法),如何從Gaussian計算后的那些一大片數(shù)據(jù)中找到有用的信息呢? DPP CL MeOH 過渡態(tài).gif TS結(jié)構(gòu)及氫鍵.jpg [ 來自科研家族 高分子家族 ] |

至尊木蟲 (著名寫手)

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