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【求助】半經(jīng)驗(yàn)方法優(yōu)化過渡金屬? 已有4人參與
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專家:你們好! 請(qǐng)問半經(jīng)驗(yàn)方法可以用來優(yōu)化含過渡金屬的體系嗎? 我用AM1方法優(yōu)化Cu時(shí),總是出現(xiàn)如下錯(cuò)誤: Rotational constants (GHZ): 0.0202481 0.0193734 0.0124244 Standard basis: VSTO-3G (5D, 7F) There are 400 symmetry adapted basis functions of A symmetry. Integral buffers will be 262144 words long. Raffenetti 2 integral format. Two-electron integral symmetry is turned on. 400 basis functions, 1200 primitive gaussians, 400 cartesian basis functions 240 alpha electrons 239 beta electrons nuclear repulsion energy 9684.0231026384 Hartrees. Warning! Cu atom 154 has 11 valence electrons but only 4 basis functions. This is less than a minimal basis set! NAtoms= 154 NActive= 154 NUniq= 154 SFac= 1.00D+00 NAtFMM= 60 Big=T Simple Huckel Guess. NBasis= 400 NMin= 405 so simple Huckel guess is impossible. Error termination via Lnk1e in f:\g03\l401.exe at Sat Sep 04 20:41:25 2010. Job cpu time: 0 days 0 hours 0 minutes 20.0 seconds. File lengths (MBytes): RWF= 440 Int= 0 D2E= 0 Chk= 1 Scr= 1 為什么會(huì)出現(xiàn)but only 4 basis functions.?怎樣解決呢 ? 當(dāng)我優(yōu)化其他過渡金屬如Cd時(shí)就可以正常進(jìn)行。 [ Last edited by yjcmwgk on 2010-9-7 at 12:32 ] |

至尊木蟲 (職業(yè)作家)
木蟲 (小有名氣)


專家顧問 (職業(yè)作家)
地溝油冶煉專家
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至尊木蟲 (職業(yè)作家)
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謝謝您! 可是發(fā)表在JACS上的一篇文獻(xiàn)做到了。他們是怎么做到的呢? 文獻(xiàn)題目為:Carbonyl-Ene Reactions Catalyzed by Bis(oxazoline) Copper (II) Complexes Proceed by a Facile Stepwise Mechanism: DFT and ONIOM (DFT: PM3) Studies 他是這樣做到的:The ONIOM calculations were carried out with a slightly modified version of Gaussian98 developed by us which incorporates the semiempirical parameterization for transition metals (from ref. 11). 其中 ref.11 :為 (a) Thiel, W.; Voityuk, A. A. Theor. Chim. Acta 1992, 81, 391 404. (b) Thiel, W.; Voityuk, A. A. Theor. Chim. Acta 1996, 93, 315. (c) HyperChem, Hypercube, Inc.: Gainesville, FL 三篇參考文獻(xiàn)。 請(qǐng)問如何修改半經(jīng)驗(yàn)參數(shù)呢? |

至尊木蟲 (職業(yè)作家)
禁蟲 (文壇精英)
密度泛函·小卒
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你說的這個(gè)算法我還是第一次見到。不能給你明確回答 半經(jīng)驗(yàn)算法幾乎能做全部元素,但是必須自己寫參數(shù) 比如這個(gè)文獻(xiàn)中(JPCB 2008 112 4204),作者將AM1和PM3分別發(fā)展成了SparkleAM1和SparklePM3,用來做鑭系金屬還是不錯(cuò)的。 要想得到SparkleAM1和SparklePM3的具體參數(shù),需要寫信跟作者要 |
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