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EES Graduate Seminar Series presents "Free and metal-organic framework (MOF) encaged Pt(II)TMPyP porphyrin for anion sensing" by Dr. Dilshad Masih

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  • Fri, 04/06/2018 - 2:00pm




 

EES GRADUATE SEMINAR SERIES

Free and metal-organic framework (MOF) encaged Pt(II)TMPyP porphyrin for anion sensing

by Dr. D. Masih, Post-Doc Fellow
Earth & Environmental Sciences, University of Windsor

ABSTRACT 
Selectivity and sensitivity of sensors are of great interest, and a lot of effort is now devoted to improving these characteristics. In particular, anions, halides (F−, Cl−, Br−, and I−), sulfide (S2−), and cyanide (CN−) play essential roles in many biological, chemical, and environmental processes. Some of these anions lead to a negative impact even at very low concentrations. Novel sensing properties of a free platinum-metallated porphyrin (Pt(II)TMPyP) are reported for the first time. Pt(II)TMPyP offers a unique one-step direct method of photoluminescence (PL) quenching, a Turn-Off signal for sensing anions in aqueous and non-aqueous media. This approach offers an easy, rapid, environmentally friendly, economical and ultra-sensitive approach for the determination of anions. Importantly, the selective sensing of anions is one of the largest challenges impeding the sensing-research area due to their similar physical and chemical behaviours. The photoinduced triplet-state electron transfer of Pt(II)TMPyP showed a low anions detection limit of unprecedented level but lacked selectivity. Hence, in order to gain selectivity, the fluorophore, Pt(II)TMPyP is restricted in a porous structure. MOFs, among other porous materials, possess a unique structural tunability, which anticipate benefit of the framework for additional selectivity, due to the restricted movement of the fluorophore, along with controlled size and shape or the accessibility of the pores to the physicochemically driven interaction for certain species. Active fluorophore, Pt(II)TMPyP is successfully encapsulated in a rho-type zeolite-like metal-organic framework (rho-ZMOF) and applied for anion-selective sensing. The sensing activity and selectivity of the composite Pt(II)TMPyP/rho-ZMOF for various anions in aqueous and methanolic media were compared to that of the free (non-encapsulated) Pt(II)TMPyP. In contrast to the non-selective activity of free porphyrin, the Pt(II)TMPyP encapsulated in the rho-ZMOF framework possessed a unique chemical structure to overcome such limitations. Furthermore, a PL Turn-On signal, particularly upon interaction with S2−is interesting for practical usage. These investigations have put forth a new and simple approach for a potential use of highly active fluorophore composite in complex sensing applications, including environmental conditions and bio-sensing, which require ion selectivity at low levels.

BIO
Dilshad earned Ph.D. Environmental Chemistry and Engineering from Tokyo Institute of Technology (Tokyo Tech) as a Japanese Government Monbukagakusho scholar. He continued stay at Tokyo Tech and worked for four years on the development of catalyst and adsorbent materials for applications in environment and energy sector. Then he moved to Saudi Arabia and joined King Abdullah University of Science and Technology (KAUST). At KAUST, he worked on novel materials for harvesting solar energy and applications as sensor. Before joining Windsor University, he worked at Western University on design and development of innovative nano-materials and composites for visible-light active photocatalysis. Dilshad has published 30 research papers in peer-reviewed journals, one US patent to his name, and h-index of 12..

    REFERENCES

  1. Dilshad Masih, Valeriya Chernikova, Osama Shekhah, Mohamed Eddaoudi, and Omar F. Mohammed ‘Zeolite-like metal-organic framework (MOF) encaged Pt(II)-porphyrin for anion-selective sensing’ ACS Applied Materials & Interfaces, 2018, under review.
  2. Dilshad Masih, Shawkat M. Aly, Erkki Alarousu, and Omar F. Mohammed ‘Methods and systems for measuring anions’ US Patent, 2016, US-2016-0238582-A1.
  3. Dilshad Masih, Shawkat M. Aly, Erkki Alarousu, and Omar F. Mohammed ‘Photoinduced triplet-state electron transfer of platinum porphyrin: a one-step direct method for sensing iodide with an unprecedented detection limit’ Journal of Materials Chemistry A, 2015, 3, 6733.

 

Friday, April 6, 2018 at 2:00 p.m.
Room 311, Memorial Hall
All Are Welcome!



Marg Mayer
mmayer@uwindsor.ca
(519)253-3000 ext.2528