Fine tuning of photophysical properties of meso-meso-linked Zn II -diporphyrins by dihedral angle control

Naoya Yoshida, Tomoya Ishizuka, Atsuhiro Osuka, Dae Hong Jeong, Hyun Sun Cho, Dongho Kim, Yoichi Matsuzaki, Atsushi Nogami, Kazuyoshi Tanaka

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Abstract

A series of meso-meso-linked diporphyrins S n strapped with a dioxymethylene group of various length were synthesized by intramolecular Ag I promoted coupling of dioxymethylene-bridged diporphyrins B n , for n = 10, 8, 6, 5, 4, 3, 2, and 1. Shortening of the strap length causes a gradual decrease in the dihedral angle between the porphyrins and increasing distortion of porphyrin ring, as suggested by MM2 calculations and 1 H NMR studies. This trend has been also suggested by X-ray crystallographic studies on the corresponding Cu II complexes of nonstrapped diporphyrin 2Cu, and strapped diporphyrins S 8 Cu, S 4 Cu, and S 2 Cu. The absorption spectrum of relatively unconstrained diporphyrins S 10 strapped with a long chain exhibits split Soret bands at 414 and 447 nm and weak Q(0,0)- and prominent Q(1,0)-bands, both of which are similar to those of nonstrapped diporphyrin 2. Shortening of the strap length causes systematic changes in the absorption spectra, in which the intensities of the split Soret bands decrease, the absorption bands at about 400 nm and > 460 nm increase in intensity, and a prominent one-band feature of a Q-band is changed to a distinct two-band feature with concurrent progressive red-shifts of the lowest Q(0,0)-band. The fluorescence spectra also exhibit systematic changes, roughly reflecting the changes of the absorption spectra. The strapped diporphyrins S n are all chiral and have been separated into enantiomers over a chiral column. The CD spectra of the optically active S n display two Cotton effects at 430-450 and at about 400 nm with the opposite signs. The latter effect can be explained in terms of oblique arrangement of m ⊥1 and m ⊥2 dipole moments, while the former effect cannot be accounted for within a framework of the exction coupling theory. The resonance Raman (RR) spectra taken for excitation at 457.9 nm are variable among S n , while the RR spectra taken for excitation at 488.0 nm are constant throughout the S n series. These photophysical properties can be explained in terms of INDO/SSCI calculations, which have revealed charge transfer (CT) transitions accidentally located close in energy to the excitonic Soret transitions. This feature arises from a close proximity of the two porphyrins in meso-meso-linked diporphyrins. In addition to the gradual redshift of the exciton split Soret band, the calculations predict that the high-energy absorption band at about 400 nm, the lower energy Cotton effect, and the RR spectra taken for excitation at 457.9 nm are due to the CT states which are intensified upon a decrease in the dihedral angle.

Original languageEnglish
Pages (from-to)58-75
Number of pages18
JournalChemistry - A European Journal
Volume9
Issue number1
DOIs
Publication statusPublished - 2003 Jan 3

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Dihedral angle
Absorption spectra
Tuning
Porphyrins
Raman scattering
Cotton
Charge transfer
Enantiomers
Dipole moment
Energy absorption
Excitons
Fluorescence
Nuclear magnetic resonance
X rays

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

Cite this

Yoshida, Naoya ; Ishizuka, Tomoya ; Osuka, Atsuhiro ; Jeong, Dae Hong ; Cho, Hyun Sun ; Kim, Dongho ; Matsuzaki, Yoichi ; Nogami, Atsushi ; Tanaka, Kazuyoshi. / Fine tuning of photophysical properties of meso-meso-linked Zn II -diporphyrins by dihedral angle control In: Chemistry - A European Journal. 2003 ; Vol. 9, No. 1. pp. 58-75.
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author = "Naoya Yoshida and Tomoya Ishizuka and Atsuhiro Osuka and Jeong, {Dae Hong} and Cho, {Hyun Sun} and Dongho Kim and Yoichi Matsuzaki and Atsushi Nogami and Kazuyoshi Tanaka",
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Yoshida, N, Ishizuka, T, Osuka, A, Jeong, DH, Cho, HS, Kim, D, Matsuzaki, Y, Nogami, A & Tanaka, K 2003, ' Fine tuning of photophysical properties of meso-meso-linked Zn II -diporphyrins by dihedral angle control ', Chemistry - A European Journal, vol. 9, no. 1, pp. 58-75. https://doi.org/10.1002/chem.200390004

Fine tuning of photophysical properties of meso-meso-linked Zn II -diporphyrins by dihedral angle control . / Yoshida, Naoya; Ishizuka, Tomoya; Osuka, Atsuhiro; Jeong, Dae Hong; Cho, Hyun Sun; Kim, Dongho; Matsuzaki, Yoichi; Nogami, Atsushi; Tanaka, Kazuyoshi.

In: Chemistry - A European Journal, Vol. 9, No. 1, 03.01.2003, p. 58-75.

Research output: Contribution to journalArticle

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T1 - Fine tuning of photophysical properties of meso-meso-linked Zn II -diporphyrins by dihedral angle control

AU - Yoshida, Naoya

AU - Ishizuka, Tomoya

AU - Osuka, Atsuhiro

AU - Jeong, Dae Hong

AU - Cho, Hyun Sun

AU - Kim, Dongho

AU - Matsuzaki, Yoichi

AU - Nogami, Atsushi

AU - Tanaka, Kazuyoshi

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N2 - A series of meso-meso-linked diporphyrins S n strapped with a dioxymethylene group of various length were synthesized by intramolecular Ag I promoted coupling of dioxymethylene-bridged diporphyrins B n , for n = 10, 8, 6, 5, 4, 3, 2, and 1. Shortening of the strap length causes a gradual decrease in the dihedral angle between the porphyrins and increasing distortion of porphyrin ring, as suggested by MM2 calculations and 1 H NMR studies. This trend has been also suggested by X-ray crystallographic studies on the corresponding Cu II complexes of nonstrapped diporphyrin 2Cu, and strapped diporphyrins S 8 Cu, S 4 Cu, and S 2 Cu. The absorption spectrum of relatively unconstrained diporphyrins S 10 strapped with a long chain exhibits split Soret bands at 414 and 447 nm and weak Q(0,0)- and prominent Q(1,0)-bands, both of which are similar to those of nonstrapped diporphyrin 2. Shortening of the strap length causes systematic changes in the absorption spectra, in which the intensities of the split Soret bands decrease, the absorption bands at about 400 nm and > 460 nm increase in intensity, and a prominent one-band feature of a Q-band is changed to a distinct two-band feature with concurrent progressive red-shifts of the lowest Q(0,0)-band. The fluorescence spectra also exhibit systematic changes, roughly reflecting the changes of the absorption spectra. The strapped diporphyrins S n are all chiral and have been separated into enantiomers over a chiral column. The CD spectra of the optically active S n display two Cotton effects at 430-450 and at about 400 nm with the opposite signs. The latter effect can be explained in terms of oblique arrangement of m ⊥1 and m ⊥2 dipole moments, while the former effect cannot be accounted for within a framework of the exction coupling theory. The resonance Raman (RR) spectra taken for excitation at 457.9 nm are variable among S n , while the RR spectra taken for excitation at 488.0 nm are constant throughout the S n series. These photophysical properties can be explained in terms of INDO/SSCI calculations, which have revealed charge transfer (CT) transitions accidentally located close in energy to the excitonic Soret transitions. This feature arises from a close proximity of the two porphyrins in meso-meso-linked diporphyrins. In addition to the gradual redshift of the exciton split Soret band, the calculations predict that the high-energy absorption band at about 400 nm, the lower energy Cotton effect, and the RR spectra taken for excitation at 457.9 nm are due to the CT states which are intensified upon a decrease in the dihedral angle.

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