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Issue 2, 2017
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Halochromic coordination polymers based on a triarylmethane dye for reversible detection of acids

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Abstract

Chromeazurol B (Na2HL) is a pH-sensitive (halochromic) dye based on a hydroxytriarylmethane core and two carboxylate functional groups, which makes it suitable for the synthesis of coordination polymers. Two new coordination polymers [NaZn4(H2O)3(L)3]·3THF·3H2O (1) and [Zn3(H2O)32-OH2)(μ3-OH)(HL)2(H2L)]·2THF·3H2O (2) incorporating Chromeazurol B linkers have been prepared and characterised. The structure of 1 comprises pentanuclear heterometallic {Zn4Na} nodes linked by six L3− anions to give a layered structure with a honeycomb topology. 2 crystallizes as a double-chain ribbon (ladder) structure with two types of metal node: a mononuclear Zn(II) cation and tetranuclear {Zn(II)}4 cluster. Chromeazurol B anions link each tetranuclear cluster to four individual Zn(II) cations and each Zn(II) cation with four tetranuclear clusters. Both compounds show pH-sensitivity in water solution which can be observed visually, giving the first example of a halochromic coordination polymer. The halochromic properties of 1 towards HCl vapors were systematically investigated. As-synthesized violet-grey 1 reversibly changes color from orange to pink in the presence of vapors of 2 M and 7 M HCl, respectively. The coordination of the Chromeazurol B anion at each color stage was examined by diffuse reflectance spectroscopy and FT-IR measurements. The remarkable stability of 1 to acid and the observed reversible and reproducible color changes provide a new design for multifunctional sensor materials.

Graphical abstract: Halochromic coordination polymers based on a triarylmethane dye for reversible detection of acids

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Publication details

The article was received on 16 Oct 2016, accepted on 05 Dec 2016 and first published on 05 Dec 2016


Article type: Paper
DOI: 10.1039/C6DT03969C
Citation: Dalton Trans., 2017,46, 465-470
  • Open access: Creative Commons BY license
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    Halochromic coordination polymers based on a triarylmethane dye for reversible detection of acids

    M. S. Zavakhina, I. V. Yushina, D. G. Samsonenko, D. N. Dybtsev, V. P. Fedin, S. P. Argent, A. J. Blake and M. Schröder, Dalton Trans., 2017, 46, 465
    DOI: 10.1039/C6DT03969C

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