Solid-substrate room-temperature phosphorescence study on zinc(ll) and tin(IV) protoporphyrins and their interaction with DNA

Ai Jun Tong*, Lu Liu, Lei Liu, Long Di Li, Carmen W K HUIE

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The solid-substrate room-temperature phosphorescence (SS-RTP) of two commercially available metalloporphyrin compounds, zinc(II) protoporphyrin (ZnPP) and tin(IV) protoporphyrin (SnPP) has been studied. Strong and stable RTP signals of the two metalloporphyrins in neutral to weakly basic solutions can be simply induced on filter paper without addition of external heavy atom perturbers. Their emission bands appeared at 723 nm for ZnPP and 718 nm for SnPP at an excitation wave-length of 417 nm. Compared with SnPP, ZnPP is a better RTP probe for DNA because its RTP enhancement effect is much higher under the same experimental conditions. The interaction of ZnPP with DNA at pH 8.5 gives an apparent binding constant of 9.1 × 103 which is similar to that of the cationic porphyrin absorption probe CuTMPyP (copper (II)- tetrakis(4-N-methylpyridyl)porphine complex). Hydrogen bonding between the monocarboxylic acid substituent of ZnPP and the base pairs of DNA plays a crucial role in the binding.

Original languageEnglish
Pages (from-to)1023-1028
Number of pages6
JournalAnalytical and Bioanalytical Chemistry
Volume370
Issue number8
Publication statusPublished - 2001

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry

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