24小时热门版块排行榜    

查看: 1638  |  回复: 11
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

linyanglin

木虫 (著名写手)

[求助] 请问有人知道怎样计算配合物基态的氧化电势,急用!如果解决了再送50金币

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.
每个吉布斯自由能是如何得到的,输入文件的关键词应该怎样设置呢,谢谢。

[ Last edited by linyanglin on 2011-6-10 at 20:11 ]
回复此楼

» 猜你喜欢

» 本主题相关价值贴推荐,对您同样有帮助:

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

linyanglin

木虫 (著名写手)

引用回帖:
Originally posted by gmy1990 at 2011-06-13 08:42:16:
做个优化,执行路径加上freq=noraman(不算拉曼),最后搜索sum,就会有你想要的吉布斯自由能!

但是上面的文献上应该说的是分别计算改配合物基态和氧化态的吉布斯自由能,而其基态吉布斯自由能是先在真空中优化,然后再计算真空中的单点能=Gvac然后加上该基态在溶剂中优化再分别计算它在气相和溶剂中的单点能,即ΔGsolv,故算出基态的吉布斯自由能。Gsolv=Gvac+ ΔGsolv,但是请问此处的气相指的是该配合物吗?谢谢
3楼2011-06-13 09:16:42
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 12 个回答

gmy1990

荣誉版主 (著名写手)

优秀版主优秀版主

【答案】应助回帖

linyanglin(金币+5): 谢谢! 2011-06-13 09:37:06
做个优化,执行路径加上freq=noraman(不算拉曼),最后搜索sum,就会有你想要的吉布斯自由能!
2楼2011-06-13 08:42:16
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

gmy1990

荣誉版主 (著名写手)

优秀版主优秀版主

【答案】应助回帖

linyanglin(金币+5): 谢谢! 2011-06-13 10:01:14
引用回帖:
Originally posted by linyanglin at 2011-06-13 09:16:42:
但是上面的文献上应该说的是分别计算改配合物基态和氧化态的吉布斯自由能,而其基态吉布斯自由能是先在真空中优化,然后再计算真空中的单点能=Gvac然后加上该基态在溶剂中优化再分别计算它在气相和溶剂中的单点 ...

高斯中计算所谓气相和溶剂下都是指体系所处环境,所谓的溶剂下,也就是你计算的体系是液相环境,气相也就是真空环境.
4楼2011-06-13 09:49:21
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

linyanglin

木虫 (著名写手)

引用回帖:
Originally posted by gmy1990 at 2011-06-13 09:49:21:
高斯中计算所谓气相和溶剂下都是指体系所处环境,所谓的溶剂下,也就是你计算的体系是液相环境,气相也就是真空环境.

那么如果以乙醇作为溶剂的话,对基态进行优化,的命令设置为#b3lyp/lanll2dz opt freq scrf=(solvent=ch3ch2oh)这样正确吗?请问如果想要优化该化合物的氧化态,输入文件应怎样设置了?万分感谢!
5楼2011-06-13 10:00:53
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 考研化学学硕调剂,一志愿985 +3 张vvvv 2026-03-15 5/250 2026-03-16 20:25 by 张vvvv
[文学芳草园] 伙伴们,祝我生日快乐吧 +17 myrtle 2026-03-10 26/1300 2026-03-16 18:32 by 青橙Ln
[考研] 一志愿211 0703方向310分求调剂 +3 努力奋斗112 2026-03-15 3/150 2026-03-16 16:44 by houyaoxu
[考研] 321求调剂 +5 大米饭! 2026-03-15 5/250 2026-03-16 16:33 by houyaoxu
[考研] 0703一志愿211 285分求调剂 +5 ly3471z 2026-03-13 5/250 2026-03-16 16:16 by 哦哦123
[考研] 材料与化工一志愿南昌大学327求调剂推荐 +7 Ncdx123456 2026-03-13 8/400 2026-03-16 12:15 by karry wen
[考研] 0856专硕279求调剂 +5 加油加油!? 2026-03-15 5/250 2026-03-15 11:58 by 2020015
[考研] 288求调剂 +4 奇点0314 2026-03-14 4/200 2026-03-14 23:04 by JourneyLucky
[考研] 297求调剂 +4 学海漂泊 2026-03-13 4/200 2026-03-14 11:51 by 热情沙漠
[考研] 271求调剂 +10 生如夏花… 2026-03-11 10/500 2026-03-14 00:35 by 卖报员小雨
[考研] 318求调剂 +3 李新光 2026-03-10 3/150 2026-03-14 00:21 by JourneyLucky
[考研] 341求调剂 +3 番茄头--- 2026-03-10 3/150 2026-03-13 23:07 by JourneyLucky
[考研] 求调剂 +5 一定有学上- 2026-03-12 5/250 2026-03-13 18:31 by ms629
[考研] 307求调剂 +5 超级伊昂大王 2026-03-12 5/250 2026-03-13 15:56 by 棒棒球手
[考研] 求调剂 +3 程雨杭 2026-03-12 3/150 2026-03-13 15:06 by JourneyLucky
[论文投稿] 投稿问题 5+4 星光灿烂xt 2026-03-12 6/300 2026-03-13 14:17 by god_tian
[考研] 277求调剂 +4 anchor17 2026-03-12 4/200 2026-03-13 11:15 by 白夜悠长
[考研] 0856化工原理 +6 z2839474511 2026-03-10 6/300 2026-03-13 10:41 by houyaoxu
[考研] 求调剂 资源与环境 285 +3 未名考生 2026-03-10 3/150 2026-03-13 10:31 by houyaoxu
[考研] 296求调剂 +3 大口吃饭 身体健 2026-03-13 3/150 2026-03-13 10:31 by 学员8dgXkO
信息提示
请填处理意见