Photoswitching of the magnetic properties of one-dimensional π-electron systems III. Photochromic polymers with polymethine radicals in the elementary units

F. Dietz, Aleksandar Tsekov Staykov, S. Karabunarliev, N. Tyutyulkov

Research output: Contribution to journalReview article

4 Citations (Scopus)

Abstract

The switching of the magnetic properties of the photoisomeric structures of polymers with photochromic [2,2]-metacyclophanene, [2,2]-metacyclophanediene, 10-benzylidene-anthrone or 9-benzylidene-9,10-anthracene fragments and polymethine radical fragments of Wurster and Weitz type within the elementary units is investigated theoretically. The band theory is used to calculate the effective exchange interaction of the open-ring and closed-ring photoisomers, respectively. A real switching from a ferromagnetic to an anti-ferromagnetic state of the isomers has been found only for a few polymers, while in most cases an increase or decrease of the effective exchange integral at the photocyclization has been pointed out.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume155
Issue number1-3
DOIs
Publication statusPublished - Feb 20 2003
Externally publishedYes

Fingerprint

Magnetic properties
Polymers
fragments
magnetic properties
Electrons
Anthracene
rings
Exchange interactions
polymers
anthracene
Isomers
electrons
isomers
interactions
VPM chloride
anthrone

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "The switching of the magnetic properties of the photoisomeric structures of polymers with photochromic [2,2]-metacyclophanene, [2,2]-metacyclophanediene, 10-benzylidene-anthrone or 9-benzylidene-9,10-anthracene fragments and polymethine radical fragments of Wurster and Weitz type within the elementary units is investigated theoretically. The band theory is used to calculate the effective exchange interaction of the open-ring and closed-ring photoisomers, respectively. A real switching from a ferromagnetic to an anti-ferromagnetic state of the isomers has been found only for a few polymers, while in most cases an increase or decrease of the effective exchange integral at the photocyclization has been pointed out.",
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T1 - Photoswitching of the magnetic properties of one-dimensional π-electron systems III. Photochromic polymers with polymethine radicals in the elementary units

AU - Dietz, F.

AU - Staykov, Aleksandar Tsekov

AU - Karabunarliev, S.

AU - Tyutyulkov, N.

PY - 2003/2/20

Y1 - 2003/2/20

N2 - The switching of the magnetic properties of the photoisomeric structures of polymers with photochromic [2,2]-metacyclophanene, [2,2]-metacyclophanediene, 10-benzylidene-anthrone or 9-benzylidene-9,10-anthracene fragments and polymethine radical fragments of Wurster and Weitz type within the elementary units is investigated theoretically. The band theory is used to calculate the effective exchange interaction of the open-ring and closed-ring photoisomers, respectively. A real switching from a ferromagnetic to an anti-ferromagnetic state of the isomers has been found only for a few polymers, while in most cases an increase or decrease of the effective exchange integral at the photocyclization has been pointed out.

AB - The switching of the magnetic properties of the photoisomeric structures of polymers with photochromic [2,2]-metacyclophanene, [2,2]-metacyclophanediene, 10-benzylidene-anthrone or 9-benzylidene-9,10-anthracene fragments and polymethine radical fragments of Wurster and Weitz type within the elementary units is investigated theoretically. The band theory is used to calculate the effective exchange interaction of the open-ring and closed-ring photoisomers, respectively. A real switching from a ferromagnetic to an anti-ferromagnetic state of the isomers has been found only for a few polymers, while in most cases an increase or decrease of the effective exchange integral at the photocyclization has been pointed out.

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