期刊
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
卷 110, 期 8, 页码 1559-1564出版社
WILEY
DOI: 10.1002/qua.22243
关键词
electronic absorption spectra; phthalocyanine; porphyrin; rare earth; double-decker; density functional theory
类别
资金
- Natural Science Foundation of China
- Ministry of Education of China
- University of Science and Technology Beijing
- Shandong University
The nature of the near-IR band in the electronic absorption spectra of bis(tetrapyrrole) rare earth(III) complexes Y(Pc)(2) (1), La(Pc)(2) (2), Y(Pc)(Por) (3), Y(Pc)[Pc(alpha-OCH3)(4)] (4), Y(Pc)[Pc(alpha-OCH3)(8)] (5), and Y(Pc)[Pc(beta-OCH3)(8)] (6) was studied on the basis of time-dependent density functional theory (TD-DFT) calculations. The electronic dipole moment along the z-axis in the electronic transition of the near-IR band in all the studied neutral bis(tetrapyrrole) yttrium(III) and lanthanum(II) double-deckers is well explained on the basis of the composition analysis of the orbitals involved. The electronic transition in the near-IR band causes the reversion of the orbital orientation of one tetrapyrrole ring in both homoleptic and heteroleptic bis(tetrapyrrole) rare earth complexes and induces electron transfer from the tetrapyrrole ring with lower orbital energy to the other ring in the heteroleptic bis(tetrapyrrole) rare earth(III) complexes. The near-IR band can work as an ideal characteristic absorption band to reflect the pi-pi interaction between the two tetrapyrrole rings in bis(tetrapyrrole) rare earth(III) double-decker complexes because of its peculiar electronic transition nature. (C) 2009 Wiley Periodicals, Inc. Int J Quantum Chem 110: 1559-1564, 2010
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