TY - JOUR
T1 - Highly fluorescent sensing of nitroaromatic explosives in aqueous media using pyrene-linked PBEMA microspheres
AU - Turhan, Hamza
AU - Tukenmez, Ece
AU - Karagoz, Bunyamin
AU - Bicak, Niyazi
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/3/1
Y1 - 2018/3/1
N2 - Crosslinked 2-bromoethyl methacrylate polymer (PBEMA) was prepared in micro-spherical form (2–5 µm) by precipitation polymerization methodology. The bromide substituent was substituted with an azide group, which was then coupled with 1-[(2-Propynyloxy)methyl]pyrene] via alkyne-azide click chemistry. The pyrene-linked microspheres showed an intense green-blue excimer emission with a maximum at 480 nm, implying π−π stacking between the pyrene moieties on the microsphere surfaces. This fluorescence emission is extremely sensitive to the aromatic nitro compounds. So that the green-blue light fades immediately upon addition of trace amounts of 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT) and 2,4,6-trinitro phenol (TNP) in 100% aqueous media. Stern-Volmer plots were employed for comparison of their fluorescence quenching effects. The plots revealed Stern-Volmer constants of 1.33 × 105, 2.451 × 105 and 1.076 × 105 M−1 for TNT, TNP and DNT, respectively. Furthermore, it has been observed that, the microspheres can be reused several times, without losing excimer emission properties.
AB - Crosslinked 2-bromoethyl methacrylate polymer (PBEMA) was prepared in micro-spherical form (2–5 µm) by precipitation polymerization methodology. The bromide substituent was substituted with an azide group, which was then coupled with 1-[(2-Propynyloxy)methyl]pyrene] via alkyne-azide click chemistry. The pyrene-linked microspheres showed an intense green-blue excimer emission with a maximum at 480 nm, implying π−π stacking between the pyrene moieties on the microsphere surfaces. This fluorescence emission is extremely sensitive to the aromatic nitro compounds. So that the green-blue light fades immediately upon addition of trace amounts of 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT) and 2,4,6-trinitro phenol (TNP) in 100% aqueous media. Stern-Volmer plots were employed for comparison of their fluorescence quenching effects. The plots revealed Stern-Volmer constants of 1.33 × 105, 2.451 × 105 and 1.076 × 105 M−1 for TNT, TNP and DNT, respectively. Furthermore, it has been observed that, the microspheres can be reused several times, without losing excimer emission properties.
KW - 2-Bromoethyl methacrylate (BEMA)
KW - Aqueous phase
KW - Click chemistry
KW - Fluorescence quenching
KW - Nitroaromatic detection
KW - Pyrene
UR - http://www.scopus.com/inward/record.url?scp=85032673114&partnerID=8YFLogxK
U2 - 10.1016/j.talanta.2017.10.061
DO - 10.1016/j.talanta.2017.10.061
M3 - Article
C2 - 29310209
AN - SCOPUS:85032673114
SN - 0039-9140
VL - 179
SP - 107
EP - 114
JO - Talanta
JF - Talanta
ER -