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论文类型:期刊论文
第一作者:Ji, Min
通讯作者:Hao, C (reprint author), Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Liaoning, Peoples R China.
合写作者:Lan, Xin,Han, Zhenping,Hao, Ce,Qiu, Jieshan
发表时间:2012-11-19
发表刊物:INORGANIC CHEMISTRY
收录刊物:SCIE、PubMed、Scopus
卷号:51
期号:22
页面范围:12389-12394
ISSN号:0020-1669
摘要:The electronically excited state and luminescence property of metal organic framework MOF-5 were investigated using relativistic density functional theory (DFT) and time-dependent DFT (TDDFT). The geometry, IR spectra, and UV-vis spectra of MOF-S in the ground state were calculated using relativistic DFT, leading to good agreement between the experimental and theoretical results. The frontier molecular orbitals and electronic configuration indicated that the luminescence mechanism in MOF-5 follows ligand-to-ligand charge transfer (LLCT), namely, pi* -> pi, rather than emission with the ZnO quantum dot (QD) proposed by Bordiga et al. The geometry and IR spectra of MOF-5 in the electronically excited state have been calculated using the relativistic TDDFT and compared with those for the ground state. The comparison reveals that the Zn4O13 QD is rigid, whereas the ligands BDC2- are nonrigid. In addition, the calculated emission band of MOF-5 is in good agreement with the experimental result and is similar to that of the ligand H2BDC. The combined results confirmed that the luminescence mechanism for MOF-5 should be LLCT with little mixing of the ligand-to-metal charge transfer. The reason for the MOF-5 luminescence is explained by the excellent coplanarity between the six-membered ring consisting of zinc, oxygen, carbon, and the benzene ring.