Design of star-shaped organoiron oligomers with azo ...



Title Design of star-shaped organoiron oligomers with azo dye bridges.
Author(s) Alaa S. Abd-El-Aziz, Elizabeth A. Strohm, Man Ding, Rawda M. Okasha, Tarek H. Afifi, Sibel Sezgin, Paul R. Shipley
Journal Journal of Inorganic and Organometallic Polymers and Materials,
Date 2010
Volume 20
Issue 3
Start page 592
End page 603
Abstract A series of star-shaped macromolecules bearing distinct symmetrical branches with alternating organoiron complexes and azobenzene moieties were synthesized using both convergent and divergent approaches. The various azo dye and organoiron-containing branches were reacted with multifunctional cores via metal-mediated nucleophilic aromatic substitution and ester condensation reactions to afford multi-substituted three- and four-arm star-shaped oligomers. UV–vis spectral studies of complexes 15 and 22 (λ max = 435 and 427 nm, respectively) show bathochromic shifts (λ max = 576 and 558, respectively) at various HCl concentrations indicating their use as potential acid sensors. Cyclic voltammetric studies of the octa-iron oligomer 22 were reversibly reduced at E 1/2 = −1.53 V.
DOI 10.1007/s10904-010-9393-2

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