A triphenylphosphonium-functionalised cyclometalated platinum(II) complex as a nucleolus-specific two-photon molecular dye

Chi Kin Koo, Leo K.Y. So, Ka-Leung WONG, Yu Man Ho, Yun Wah Lam*, Michael H.W. Lam, Kok Wai CHEAH, Chopen Chan Wut Cheng, Wai Ming Kwok

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

An organometallic cyclometalated platinum(II) complex, [Pt(L 3)Cl] [PF6], has been synthesised from a specially designed cyclometalating ligand, HL3 (triphenyl{5-[3-(6- phenylpyridin-2-yl)-l//-pyrazol-1-yl]pentyl}phosphonium chloride), that contains a pendant carbon chain carrying a terminal cationic triphenylphosphonium moiety. Aside from its room temperature single-photon luminescent properties in solution, [Pt(L3)Cl] + can also produce two-photon-induced luminescence at room temperature upon excitation at 700 nm from a mode- locked Ti: sapphire laser. Its twophoton absorption cross-section in DMF at room temperature was measured to be 28.0 x 10-50cm4 s photon-1. [Pt(L3)Cl]+ is able to selectively stain the cell nucleolus. This has been demonstrated by two-photon confocal imaging of live and methanol-fixed HeLa (human cervical carcinoma) and 3T3 (mouse skin fibroblasts) cells. This organelle specificity is likely to be related to its special affinity for proteins within cell nucleoli. As a result of such protein affinity, [Pt(L3)Cl]+ is an efficient RNA transcription inhibitor and shows rather profound cytotoxicity. On the other hand, the organelle-specific labelling and two-photon-induced luminescent properties of [Pt(L3)Cl]+ renders it a useful nuclear dye for the 3-dimensional reconstruction of optical sections of thick tissues, for example, mouse ileum tissues, by multiphoton confocal microscopy.

Original languageEnglish
Pages (from-to)3942-3950
Number of pages9
JournalChemistry - A European Journal
Volume16
Issue number13
DOIs
Publication statusPublished - 6 Apr 2010

Scopus Subject Areas

  • Catalysis
  • Organic Chemistry

User-Defined Keywords

  • Imaging agents
  • Optical tissue sectioning
  • Organelle-specific labeling
  • Platinum
  • Two-photon imaging

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