AIPE-active green phosphorescent iridium(iii) complex impregnated test strips for the vapor-phase detection of 2,4,6-trinitrotoluene (TNT)

Abstract

Detection of explosives, especially trinitrotoluene (TNT), is of utmost importance due to its highly explosive nature and environmental hazard. Therefore, detection of TNT has been a matter of great concern to the scientific community worldwide. Herein, a new aggregation-induced phosphorescent emission (AIPE)active iridium(III) bis(2-(2,4-difluorophenyl)pyridinato-N,C2 0 ) (2-(2-pyridyl)benzimidazolato-N,N 0 ) complex [FIrPyBiz] has been developed and serves as a molecular probe for the detection of TNT in the vapor phase, solid phase, and aqueous media. In addition, phosphorescent test strips have been constructed by impregnating Whatman filter paper with aggregates of FIrPyBiz for trace detection of TNT in contact mode, with detection limits in nanograms, by taking advantage of the excited state interaction of AIPEactive phosphorescent iridium(III) complex with that of TNT and the associated photophysical properties.

Evaluation of photoluminescence quenching for assessing the binding of nitroaromatic compounds to a tyrosyl bolaamphiphile self-assembly

“…This adequate energy level difference makes excited electron transfer effective from the photoluminescent probe to the nitroaromatic compounds. 27,28 The LUMO energy levels determined from the reduction potentials were supported further by DFT calculation. DFT is a 15 quantum-mechanical method widely used in chemistry and physics to calculate the electronic structure of atoms, molecules, and solids.…”

Sensing of 2,4,6‐Trinitrotoluene (TNT) and 2,4‐Dinitrotoluene (2,4‐DNT) in the Solid State with Photoluminescent RuII and IrIII Complexes

“…This reductive photoinduced electron transfer (PET) albeit cited as a reason for quenching of various fluorophores was never previously demonstrated. [10,16,18,20] First, we performed reductive spectroelectrochemistry (Figure 8 A) on TNT in degassed acetonitrile. This experiment revealed the spectral signature corresponding to TNTC À at (l max = 490 nm).…”

“…[12c] Despite this, luminescent transition-metal complexes have never been investigated together with TNT until Reddy and co-workers reported an Ir III complex ([FIrPyBiz] F = 2-(2,4-difluorophenyl) pyridine; PyBiz = 2-(pyridin-2-yl) benzo[d]imidazole) as a sensor for TNT. [20] While the mechanism of quenching is widely assumed to be due to photoinduced electron transfer, none of the studies above provided definitive evidence of the actual quenching mechanism. In this contribution, we report the use of photoluminescent inorganic metal-to-ligand charge-transfer (MLCT) complexes containing Ru II -and Ir III -containing polypyridine ligands for the sensing of nitroaromatics and 2,3-dimethyl-2,3-dinitrobutane (DMDNB), a common taggant for explosives (Figure 1 [21] has found widespread use as a non-covalent photoluminescent stain for proteins in electrophoretic separations [22] and as a chemiluminescent sensor.…”

Strong Influence of the Ancillary Ligand over the Photodynamic Anticancer Properties of Neutral Biscyclometalated IrIII Complexes Bearing 2‐Benzoazole‐Phenolates

“…2018, 24,17523 -17537 www.chemeurj.org 2018 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim close to 2 ). [41][42][43][44][45][46] The bond lengths for the ancillary ligand are significantly longerd ue to the strong trans influence exerted by the donor Ca toms, Ir(1)ÀN(1) = 2.147(4) and Ir(1)ÀO(1) = 2.159 (3) . [47,48] The bite angle for L1,N (1)-Ir(1)-O(1) = 84.0(1)8, is comparable to those previously reported for six-membered N-Ir-O iridacycles in analogous derivatives, [39] and the C-Ir-N bite angles fort he cyclometalated C^N ligands, C(35)-Ir(1)-N(4) and C(24)-Ir(1)-N(3), are also standard ( % 808).…”