Controlled emission of platinum(II) terpyridyl complexes with poly-l-glutamic acid

Toshiyuki Moriuchi, Masahiro Yamada, Kazuki Yoshii, Toshikazu Hirao

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Poly-l-glutamic acid, P(Glu), bearing multiple negatively charged side chains served as a polymeric spatially aligned scaffold for the aggregation of positively charged platinum(II) complexes [Pt(trpy)CCR](OTf) (trpy = 2,2′,6′,2″-terpyridine; R = Ph (PtH), PhC12H 25-p (PtC12)) through electrostatic interaction, resulting in tunable emission properties. PtC12 was found to exhibit gradual increase in the emission intensity based on the triplet metal-metal-to-ligand charge transfer (3MMLCT) in a tris/HCl buffer (pH 7.6)/MeOH (v/v = 1/14) solution with concomitant decrease in the emission intensity based on the triplet metal-to-ligand charge transfer (3MLCT)/the triplet ligand-to-ligand charge transfer (3LLCT) as the amount of P(Glu) was increased. Such synergistic effect was not observed in the case of PtH, wherein the emission intensity based on 3MLCT/3LLCT was increased by the increase in the amount of P(Glu), indicating that alkyl long chain of PtC12 is considered to play an important role in the aggregation of the platinum(II) terpyridyl moieties to show Pt(II)-Pt(II) and π-π interactions.

Original languageEnglish
Pages (from-to)2562-2566
Number of pages5
JournalJournal of Organometallic Chemistry
Volume695
Issue number23
DOIs
Publication statusPublished - 2010 Nov 1
Externally publishedYes

Fingerprint

glutamic acid
Platinum
Glutamic Acid
platinum
Ligands
ligands
Acids
Charge transfer
charge transfer
Metals
Bearings (structural)
Agglomeration
metals
Tromethamine
Coulomb interactions
Static Electricity
Scaffolds
Buffers
buffers
interactions

Keywords

  • Bioorganometallic chemistry
  • Emission properties
  • Metal-metal interaction
  • Platinum(II) complex
  • Poly-l-glutamic acid

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Biochemistry

Cite this

Controlled emission of platinum(II) terpyridyl complexes with poly-l-glutamic acid. / Moriuchi, Toshiyuki; Yamada, Masahiro; Yoshii, Kazuki; Hirao, Toshikazu.

In: Journal of Organometallic Chemistry, Vol. 695, No. 23, 01.11.2010, p. 2562-2566.

Research output: Contribution to journalArticle

Moriuchi, Toshiyuki ; Yamada, Masahiro ; Yoshii, Kazuki ; Hirao, Toshikazu. / Controlled emission of platinum(II) terpyridyl complexes with poly-l-glutamic acid. In: Journal of Organometallic Chemistry. 2010 ; Vol. 695, No. 23. pp. 2562-2566.
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