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A BODIPY‐Based Fluorescent Probe to Visually Detect Phosgene

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A BODIPY‐Based Fluorescent Probe to Visually Detect Phosgene View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by DSpace@IZTECH Institutional Repository DOI:10.1002/chem.201705613 Communication & Sensors ABODIPY**-Based Fluorescent ProbetoVisually Detect Phosgene:Toward the Development of aHandheldPhosgene Detector Melike Sayar,[a] ErmanKarakus¸ , [a, c] Tug˘rul Güner,[b] Busra Yildiz,[a] UmitHakan Yildiz,[a, d, e] and Mustafa Emrullahog˘lu*[a] the high toxicity,easy production,and widespread availability Abstract: Aboron-dipyrromethene (BODIPY)-based fluo- in the chemical industry,make phosgene an attractive agent rescentprobe with aphosgene-specific reactive motif for chemical terrorism. The need for its detection is critical not shows remarkable selectivity towardphosgene, in the only to protect civilians against terrorist plots, but also to alert presence of which the nonfluorescent dye rapidly trans- workerstoits leakageinindustrialplants. forms into anew structure and induces afluorescentre- Recent progress on the criticalsubjectofdetection has en- sponse clearly observable to the nakedeye under ultravio- richedcurrentknowledge for designing molecular probes, es- let light. Given that dynamic, aprototypical handheld pecially for phosgene.[3–10] In general,detecting phosgenewith phosgene detector with apromising sensingcapability amolecular probe involves trapping the molecule using areac- that expedites the detection of gaseous phosgenewith- tive site (e.g.,hydroxy and amine functional groups), which, out sophisticated instrumentation was developed. The following structural modification,generates adetectable opti- proposed methodusing the handhelddetector involves a cal signal, for example acolour change or fluorescenceemis- rapid response period suitablefor issuing early warnings sion. during emergency situations. The analytical performance of such probesdepends heavily on the specificity of the recognition unit employed in the probeskeleton. Scheme 1depicts general detection strategies, Phosgene(COCl2)isahighly toxic fumingliquid widely used to produce bulk chemicals and pharmaceuticals. Despite its con- temporary industrial applications, phosgene has historically suffered abad reputationowing to its use as achemical war- fare agent in World WarI.[1] Its mild odour,resembling freshly mown hay,and its colourlessness renderphosgene nearly un- detectable, even in excessive amounts. Phosgeneinhalation se- verely affects the respiratory tract and lungs, and phosgene poisoning, with symptomsthat appear hours after exposure to the chemical, often causedeath by suffocation.[2] Nevertheless, [a] M. Sayar,Dr. E. Karakus¸, B. Yildiz, Dr.U.H.Yildiz, Dr.M.Emrullahog˘lu Department of Chemistry,Faculty of Science ˙IzmirInstitute of Technology,Urla, 35430, Izmir (Turkey) E-mail:[email protected] [b] T. Güner Department of Materials Science and Engineering Izmir Institute of Technology,Urla, 35430, Izmir (Turkey) [c] Dr.E.Karakus¸ ChemistryGroup Laboratories TUBITAK National Metrology Institute (UME) 41470, Gebze-Kocaeli (Turkey) [d] Dr.U.H.Yildiz Department of Photonic Science and Engineering Izmir Institute of Technology,Urla, 35430, Izmir (Turkey) [e] Dr.U.H.Yildiz Inovasens Co. ˙Izmir Technology Development Zone Inc. Teknopark, 35430 Urla, ˙Izmir (Turkey) [**] boron-dipyrromethene Supporting information and the ORCID identification number(s) for the au- thor(s) of this article can be found under https://doi.org/10.1002/ chem.201705613. Scheme1.Reactionschemes for trapping phosgene. Chem. Eur.J.2018, 24,3136 –3140 3136 2018 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim Communication which involvetrapping phosgene through achemical reaction. Amongwidely used recognition units,[4–10] o-phenylenediamine (OPA) is unique given its exceptional specificityfor phosgene (Scheme 1c). In most cases, the OPAunit appended on the flu- orophore core can efficientlyquenchfluorophore emission during aphoto-induced electrontransfer (PET) process. Elimi- nating the PET processbyinducing areactionwith phosgene is the most efficient methodofrestoringthe fluorescence emission. Despite notable achievements in detecting phosgene, differ- entiatingphosgene from analytes with similar chemical struc- tures remainsasignificant challenge, as do low sensitivity and prolonged response times. New probe constructs that use easily accessible recognition/reactive units with improved ana- lytical performance in terms of sensitivity,analyte specificity, and response times are therefore necessary. In response to that need, herein we present the design,syn- thesis, and spectral investigation of anovel probe construct that exploits aunique reactionscheme that recognises phos- gene with excellent selectivity over other analytes. For our probe design, we used aboron-dipyrromethene (BODIPY) dye as the signal reporter,given its outstanding photophysical Scheme3.Stepwise synthesis of BOD-SYR. properties,[11] as wellasano-aminobenzyl amine group as the phosgene-specific reactive motif, which marks afirst for re- search in phosgene sensing (Scheme 1d). Et3N), exhibited no emission(FF = 0.005)inthe visible region Anticipating that phosgenewould interactwith the probe owing to PET-promoted quenching arising from the meso- reactive site to mediate acyclization reactionand thereby amine moiety.However,upon the addition of triphosgene block the PET process that would in turn induce aturn-onfluo- (1 equiv), an intense emission band appeared at 511nm rescent response (Scheme 2), we integratedthe reactive unit (Figure 1). Notably,the spectroscopic response of the probe was rapid, and we observed the complete saturation of signal intensity within ten seconds (see Figure S2 in the Supporting Information). Upon the systematic addition of triphosgene, the emission band at 511nmincreased linearly,and its intensity peaked with the addition of 6equiv of triphosgene,with an enhance- ment factor of more than 300-fold. In light of analytical data collected from the titration experiment, we estimate the lower limit of detection to be 179 nm given asignal-to-noise ratio (S/ Scheme2.Reaction-based detection of phosgene. with the BODIPY core following the synthetic route as outlined in Scheme 3. To that end, we obtained afree-amine derivative of aBODIPY dye, BOD-NH2,byreducing the meso-NO2-phenyl derivative(1). Further alkylation of BOD-NH2 with the individu- ally prepared compound 2 and subsequentreduction yieldeda sufficient amount of the titlecompound, BOD-SYR.[12] We investigated the spectroscopic response of BOD-SYR to the addition of phosgeneand other specieswith asimilarreac- tive nature by using ultraviolet-visibleand fluorescencespec- troscopy. For the spectral investigation, we used triphosgene as acomparatively safe phosgenesource,which instantly Figure 1. Absorbance andfluorescence spectra of BOD-SYR (10 mm)upon transforms into phosgeneinthe presence of tertiary amines. gradual additionofasolutionoftriphosgene (0–50 mm)inacetonitrile As expected, the BOD-SYR solution(acetonitrile, with 0.1% (CH3CN, with 0.1%Et3N), lex =460 nm. Chem.Eur.J.2018, 24,3136 –3140 www.chemeurj.org 3137 2018 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim Communication N)=3.[12] The emission became distinctly green upon contact with phosgene, which we attributed to amodification of the dye structure(Scheme 2). Anew green-emissive compound, monitored on athin-layer chromatography plate, was also clear evidence of the formationofanew BODIPY derivative. After purification with columnchromatography we confirmed the identityofthe new BODIPY structure as the cyclization product of the probe by using nuclear magnetic resonance spectroscopy (NMR) and mass analysis. Given the chemical identityofthe isolated product, the recognition of phosgene may proceed by asequential process initiated upon nucleo- philic substitution of phosgene with the primaryaryl amine, which promoted an intramolecular cyclizationtoyield anew BODIPY structure, BOD-UREA (FF = 0.52), with acyclic urea lo- cated on the meso position(Scheme 4). Figure 2. Fluorescence intensity change of BOD-SYR [10 mm,inCH3CN/ Et3N (0.1 %)] recorded2min after the addition of various analytes (10 equiv; lex =460 nm). 1) Triphosgene,2)POCl3,3)DCP,4)(COCl)2,5)SOCl2,6)TsCl, 7) CH3COCl. detect gaseous phosgene generated in situ. Seekingtodevel- op an alternative detectionstrategy that could immediately detect phosgene at exposure sites, we designed apaper-based indicator cartridge to facilitateimage capturing and the differ- entiationofcolour development. We treated the paper circles on the cartridgewith afixed concentration (1.0 mm)ofBOD- SYR to yield aphysisorbed layer of the probe,after which we placed the cartridge in sealed tubes and exposed it to varying concentrations of phosgene (0–100 ppm) generated in situ from the triphosgene–Et3Ncoupling.Next, we placed the car- tridge in ablack-box apparatus equipped with ultraviolet light- emitting diodes in front of smartphone camera (Figure 3a).[12] We captured the digital images of the cartridge in Figure 3b prior to phosgene exposure. As Figure 3c illustrates, an intensi- fying colourdevelopment wasobservable as the concentration increased.Shownfrom left to right, the concentration of ana- Scheme4.Proposed reaction mechanism for the trapping of triphosgene. We additionally investigated the spectroscopic behaviour of the probe in the presence of other potentially reactive species. Using identical sensing conditions, we observed no significant change in fluorescence for other reactiveanalytes, including acyl chlorides such as acetyl
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