DNA binding studies of cationic lanthanide complexes bearing a phenanthridinium group

G. Bobba, S. D. Kean, D. Parker*, A. Beeby, G. Baker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The binding of tetracationic - and -europium complexes of tetraamide and triamide ligands incorporating an N-methylphenanthridinium group to calf-thymus DNA, poly(dGdC) and super-coiled plasmid DNA has been monitored by absorption, luminescence and CD difference spectroscopy. With the tetraamide complexes, preferential binding to (CG) base-pairs was signalled by pronounced hypochromism, a small red shift and substantial fluorescence quenching with a limiting base-pair complex ratio of 2 : 1, consistent with an intercalative interaction and charge neutralisation. For the triamide Eu complex, a lower base-pair : complex ratio was found and changes in the form and polarisation of the Eu emission spectrum were consistent with coordination of a nucleobase phosphate group to the hydrated Eu centre.

Original languageEnglish
Pages (from-to)1738-1741
Number of pages4
JournalJournal of the Chemical Society, Perkin Transactions 2
Issue number9
DOIs
Publication statusPublished - 1 Oct 2001
Externally publishedYes

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