« Previous AbstractPhosphoinositide and inositolpolyphosphate signalling in defense responses of Arabidopsis thaliana challenged by mechanical wounding    Next AbstractSocial Behavioral Deficits with Loss of Neurofibromin Emerge from Peripheral Chemosensory Neuron Dysfunction »

Chemistry

Title:		"Sensing of 2,4,6-trinitrotoluene (TNT) and 2,4-dinitrotoluene (2,4-DNT) in the solid state with photoluminescent Ru(II) and Ir(III) complexes"
Author(s):		Mosca L; Khnayzer RS; Lazorski MS; Danilov EO; Castellano FN; Anzenbacher P;
Address:		"Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio, 43403 (USA)"
Journal Title:		Chemistry
Year:		2015
Volume:		20150128
Issue:		10
Page Number:		4056 - 4064
DOI:		10.1002/chem.201405717
ISSN/ISBN:		1521-3765 (Electronic) 0947-6539 (Linking)
Abstract:		"A series of metal-organic chromophores containing Ru(II) or Ir(III) were studied for the luminometric detection of nitroaromatic compounds, including trinitrotoluene (TNT). These complexes display long-lived, intense photoluminescence in the visible region and are demonstrated to serve as luminescent sensors for nitroaromatics. The solution-based behavior of these photoluminescent molecules has been studied in detail in order to identify the mechanism responsible for metal-to-ligand charge-transfer (MLCT) excited state quenching upon addition of TNT and 2,4-dinitrotoluene (2,4-DNT). A combination of static and dynamic spectroscopic measurements unequivocally confirmed that the quenching was due to a photoinduced electron transfer (PET) process. Ultrafast transient absorption experiments confirmed the formation of the TNT radical anion product following excited state electron transfer from these metal complexes. Reported for the first time, photoluminescence quenching realized through ink-jet printing and solid-state titrations was used for the solid-state detection of TNT; achieving a limit-of-quantitation (LOQ) as low as 5.6 ng cm(-2). The combined effect of a long-lived excited state and an energetically favorable driving force for the PET process makes the Ru(II) and Ir(III) MLCT complexes discussed here particularly appealing for the detection of nitroaromatic volatiles and related high-energy compounds"
Keywords:		electron transfer explosive sensing ink-jet printing luminescence ultrafast transient absorption;
Notes:		"PubMed-not-MEDLINEMosca, Lorenzo Khnayzer, Rony S Lazorski, Megan S Danilov, Evgeny O Castellano, Felix N Anzenbacher, Pavel Jr eng Germany 2015/01/30 Chemistry. 2015 Mar 2; 21(10):4056-64. doi: 10.1002/chem.201405717. Epub 2015 Jan 28"