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wandong8994

新虫 (小有名气)

[求助] gaussian09计算紫外吸收光谱和实验误差较大

小弟最近用Gaussian09计算紫外吸收光谱
苯酯类物质
#p opt td=(singlets,nstates=40) b3lyp/6-31g(d) scrf=(solvent=water,pcm)
用这个算的,计算出的结果和实验相差不大
但是在苯环上加上一个氯原子后计算出来的最大吸收波长和实验相差有50nm左右
后来换b3pw91、mpw1pw91、pbepbe等都算了,结果还是差几十nm
是不是加上氯原子后用这个方法算的不准,还是要用别的什么方法算
小弟最近才接触Gaussian,也只是学到了皮毛而已
还请各位大神多多指教!
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天天进步啊

木虫 (著名写手)

计算最大吸收波长有一个伍德沃德规则,你不妨试试

发自小木虫Android客户端
分子筛、分子动力学模拟,有问题可咨询我的知乎主页 https://www.zhihu.com/people/rao777
2楼2017-10-08 13:17:00
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