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

Zavakhina, Marina S.; Yushina, Irina V.; Samsonenko, Denis G.; Dybtsev, Danil; Fedin, Vladimir P.; Argent, Stephen P.; Blake, Alexander J.; Schr�der, Martin

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)3(μ2- 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 2M and 7M 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.

Citation

Zavakhina, M. S., Yushina, I. V., Samsonenko, D. G., Dybtsev, D., Fedin, V. P., Argent, S. P., Blake, A. J., & Schröder, M. (2017). Halochromic coordination polymers based on a triarylmethane dye for reversible detection of acids. Dalton Transactions, 46(2), 465-470. https://doi.org/10.1039/C6DT03969C

• Journal Article Type: Article
• Acceptance Date: Dec 5, 2016
• Online Publication Date: Dec 5, 2016
• Publication Date: Jan 3, 2017
• Deposit Date: Dec 6, 2016
• Publicly Available Date: Dec 6, 2016
• Journal: Dalton Transactions
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 2
• Pages: 465-470
• DOI: https://doi.org/10.1039/C6DT03969C
• Keywords: Coordination polymers, Zinc, Chromeazurol B, pH sensing, halochromic
• Public URL: https://nottingham-repository.worktribe.com/output/842275
• Publisher URL: http://pubs.rsc.org/en/Content/ArticleLanding/2016/DT/C6DT03969C#!divAbstract
• Additional Information: : This document is Similarity Check deposited; : Supplementary Information; : Crystal Structure Data; : Stephen P. Argent (ResearcherID); : Alexander J. Blake (ORCID); : Alexander J. Blake (ResearcherID); : Martin Schröder (ORCID); : The Royal Society of Chemistry has an exclusive publication licence for this journal; OPEN ACCESS: This article is freely available. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (CC BY 3.0); : Single-blind; : Received 16 October 2016; Accepted 5 December 2016; Accepted Manuscript published 5 December 2016; Advance Article published 13 December 2016; Version of Record published 3 January 2017
• Contract Date: Dec 6, 2016