A DFT and TD-DF1 study on intermolecular charge transfer complexes of pyrene with phenothiazine and promazine
Küçük Resim Yok
Tarih
2010
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The ground state thermodynamic stabilities of intermolecular charge transfer complexes between acceptor molecule pyrene and donor molecules phenothiazine and promazine have been investigated with DFT methods. Their vertical singlet-singlet transitions have been calculated and characterized employing TD-DFT methods, as well. In the ground state, pyrene forms slightly stable intermolecular complexes with phenothiazine and promazine in the gas phase. The phenothiazine-pyrene, [phtz-pyr], and promazine-pyrene, [pmz-pyr], complexes are 3.76 and 2.75 kcal/mol more stable compared to their reactants, respectively. For both of the complexes, the most probable four transitions belong to the local excitations (LE) within donor or acceptor molecules. However, the S(0) -> S(1) transitions with excitation wavelengths of approximate to 448 nm for [phtz-pyr] and approximate to 425 nm for [pmz-pyr] are pure CT transitions between the frontier molecular orbitals of donor and acceptor molecules. The S(0) -> S(1) transitions with an excitation wavelength of approximate to 337 nm for [phtz-pyr] and approximate to 345 nm for [pmz-pyr] are also CT transitions and the charge transfer occurring in the [pmz-pyr] complex is an n -> pi type while the character of CT transition in the [phtz-pyr] complex is purely pi -> pi. (C) 2010 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Pyrene, Phenothiazine, Promazine, TD-DFT calculations, Charge transfer complex, Excited state
Kaynak
Journal of Molecular Structure-Theochem
WoS Q Değeri
Q3
Scopus Q Değeri
Cilt
949
Sayı
01.Mar
