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

Yasuaki Einaga, Rie Mikami, Takashiro Akitsu, Guangming Li

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


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
Issue number1-2
Publication statusPublished - 2005 Dec 22


  • Cis-trans
  • Photoillumination
  • UV and visible light

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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