Synthesis, characterization and X-ray crystallography of a metallacrown ether complex containing a RuII(bpy)22+ chromophore and its Mo(CO)4 analog
作者:Jennifer M. Butler、Gary M. Gray、Juan Pablo Claude
DOI:10.1016/j.poly.2004.04.004
日期:2004.6
The chelating ligand (2,2'-Cl2H8O2)P(CH2CH2O)(4)P(2,2'-O2Cl2H8) reacts with both Ru(bPY)(2)(O3SCF3)(2) and MO(CO)(4)(C7H8) to form the new metallacrown ether complexes cis-[Ru(bPY)(2)((2,2'-C12H8O2)P(CH2CH2O)(4)P(2,2'-O2Cl2H8))](O3SCF3)(2) (1) and cis-[MO(CO)(4)((2,2'-C12H8O2)P(CH2CH2O)(4)P(2,2'-O2Cl2H8))] (2). The X-ray crystal structures for both complexes indicate that the metallacrown ether ring oxygen atoms point their lone pairs towards the cavity in the cis-metallacrown ether ring. The effect of interactions of the metallacrown ether complex with selected monoatomic cations (Li+, Na+ and Hg2+) on the emissive properties of the Ru(bPY)(2)(2+) chromophore were studied by steady-state and time-dependent emission spectroscopy. Our results suggest that complex 1 interacts weakly with Li+, Na+ and Hg2+, and subtle changes are observed in its photophysical properties. These changes are discussed in terms of excited-state parameters obtained from a Franck-Condon analysis of the emission spectra. (C) 2004 Elsevier Ltd. All rights reserved.