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Issue 9, 2016
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Anion binding, electrochemistry and solvatochromism of β-brominated oxoporphyrinogens

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Effects of macrocycle bromination on the structural, electrochemical and anion binding properties of 5,10,15,20-tetrakis(3,5-di-t-butyl-4-oxo-cyclohexa-2,5-dienylidene)porphyrinogen, OxP, are reported. Bromination of 5,10,15,20-tetrakis(3,5-di-t-butyl-4-hydroxyphenyl)-porphinatocopper(II), [T(DtBHP)P]Cu(II) yielded β-Br8OxP, which was N-alkylated to β-Br8OxPBz2 and β-Br8OxPBz4 (where Bz = 4-bromobenzyl). β-Br8OxPBz2 crystallizes in orthorhombic space group Pccn [a = 23.5535(17) Å, b = 19.3587(14) Å c = 20.9760(15) Å, V = 9564.3(12) Å3]. It has a calix[4]pyrrole-like structure with a saddle conformation and two molecules of methanol occupy a central binding site made up of the non-alkylated pyrrole N–H groups. Computational and electrochemical studies revealed widening HOMO–LUMO band gaps for the brominated compounds over the non-brominated analogues consistent with the observed hypsochromic shifts in electronic absorption spectra. Solvatochromic and chromogenic effects on anion binding were both observed for β-Br8OxP and β-Br8OxPBz2 with binding affinities of anions being greater than those observed for the corresponding OxP and OxPBz2. Colorimetric sensor studies suggest that the OxP compounds reported here are possible candidates for use in the design of optoelectronic noses for detection of anions and anionic analyte species of biological interest.

Graphical abstract: Anion binding, electrochemistry and solvatochromism of β-brominated oxoporphyrinogens

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The article was received on 30 Oct 2015, accepted on 27 Jan 2016 and first published on 28 Jan 2016

Article type: Paper
DOI: 10.1039/C5DT04258E
Citation: Dalton Trans., 2016,45, 4006-4016
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    Anion binding, electrochemistry and solvatochromism of β-brominated oxoporphyrinogens

    W. A. Webre, J. P. Hill, Y. Matsushita, P. A. Karr, K. Ariga and F. D'Souza, Dalton Trans., 2016, 45, 4006
    DOI: 10.1039/C5DT04258E

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