[Pw_forum] one strange result about the phenazine molecule

Giuseppe Mattioli giuseppe.mattioli at ism.cnr.it
Sun May 15 19:36:58 CEST 2016


Dear Dai Zhenxiang
You may be aware that DFT eigenvalues depend on the  
exchange-correlation functional employed in the calculation. Chemists  
usually use B3LYP for database purpose (it is not indicated in the  
link you provided, so I assume that it is B3LYP). Which xc functional  
have you used in your calculation?
You might enjoy this paper if you are puzzled by my considerations...

Cohen, A. J.; Mori-Sànchez, P.; Yang, W. Insights into Current  
Limitations of Density Functional Theory. Science 2008, 321, 792−794.

HTH
Giuseppe

Quoting Dai Zhenxiang <physdai at qq.com>:

> Dear all:
>   These days I have performed one test calculation about the  
> phenazine molecule.
> From the  website Nanoniele, it can be found that its HOMO-LUMO gap  
> should be 3.654eV.
> http://www.nanoniele.jp/cgi-bin/nanoniele.cgi?inputsite=ranking_HOMO_China%20Telecom&rankingflag=homolumo&inputid=174679811422510&keyword=phz
> However,  my QE calculation suggests HOMO-LUMO gap is only about  
> 2.20 eV. So, the difference is very, very big !
>
> These corresponding files are attached. Would you like to give me  
> some advice?
>
> Best wishes!
>
> DAI


-- 
********************************************************
- Article premier - Les hommes naissent et demeurent
libres et égaux en droits. Les distinctions sociales
ne peuvent être fondées que sur l'utilité commune
- Article 2 - Le but de toute association politique
est la conservation des droits naturels et
imprescriptibles de l'homme. Ces droits sont la liberté,
la propriété, la sûreté et la résistance à l'oppression.
********************************************************

    Giuseppe Mattioli
    CNR - ISTITUTO DI STRUTTURA DELLA MATERIA
    v. Salaria Km 29,300 - C.P. 10
    I 00015 - Monterotondo Stazione (RM)
    Tel + 39 06 90672836 - Fax +39 06 90672316
    E-mail: <giuseppe.mattioli at ism.cnr.it>
    http://www.ism.cnr.it/en/staff/giuseppe-mattioli/
    ResearcherID: F-6308-2012





More information about the users mailing list