Reversible photocontrol of molecular assemblies of metal complex containing azo-amphiphiles

Yasuaki Einaga, Rie Mikami, Takashiro Akitsu, Guangming Li

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Photo-controllable molecular systems, [M(en)2][Pt(en) 2Cl2](1)4 (M2+=Pt2+, Pd2+ and en=ethylenediamine), have been designed by the self-assembly of chloride-bridged platinum/palladium complexes and photochromic amphiphiles of the azobenzene derivative, 4-[4-(N-methyl-N-n-dodecylamino)phenylazo]benzene sulfonic acid (designated as compound 1). Reversible structural changes caused by cis-trans photoisomerization of azo groups in compound 1 were observed by alternating illumination of UV and visible light. Visible illumination resulted in the formation of the plate-like structures, whereas UV illumination resulted in fragmentation of the assembling structures. Reversible changes were observed in the electronic states of the chloride-bridged platinum/palladium complexes; the plate-like structures exhibited charge transfer absorption of chloride-bridged platinum complexes and delocalized Pt(II)/Pt(IV) states, while the fragments of the separated complexes exhibited no charge transfer bands. As a consequence, we have discovered that the reversible structural changes in this system could be controlled by photoillumination.

Original languageEnglish
Pages (from-to)230-236
Number of pages7
JournalThin Solid Films
Volume493
Issue number1-2
DOIs
Publication statusPublished - 2005 Dec 22

Fingerprint

Amphiphiles
Coordination Complexes
Metal complexes
Platinum
assemblies
Chlorides
ethylenediamine
platinum
Lighting
illumination
chlorides
Palladium
Charge transfer
palladium
charge transfer
metals
Photoisomerization
Azobenzene
Sulfonic Acids
sulfonic acid

Keywords

  • Cis-trans
  • Photoillumination
  • UV and visible light

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Reversible photocontrol of molecular assemblies of metal complex containing azo-amphiphiles. / Einaga, Yasuaki; Mikami, Rie; Akitsu, Takashiro; Li, Guangming.

In: Thin Solid Films, Vol. 493, No. 1-2, 22.12.2005, p. 230-236.

Research output: Contribution to journalArticle

Einaga, Yasuaki ; Mikami, Rie ; Akitsu, Takashiro ; Li, Guangming. / Reversible photocontrol of molecular assemblies of metal complex containing azo-amphiphiles. In: Thin Solid Films. 2005 ; Vol. 493, No. 1-2. pp. 230-236.
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