PRESENTS A SEMINAR
Dense Hypercoordinated versus Porous ZIFs of Alkali and Alkaline Earth Metals: Single Source Precursors for
Date: Wednesday, October 4th, 2017
Time: 11:00 AM
Location: Building 4, Room 125
Dr. Damir SAFIN
Chief expert, R&D department (NIOST LLC), SIBUR holding, Tomsk, Russian Federation
Porous materials (PMs) have been known for several decades as containers to trap and store different guest compounds. The starting point of intense use of PMs was the pioneering research studies of Yaghi and co-workers, who suggested the first efficient synthetic approach to build up controlled metal-organic frameworks, abbreviated to MOFs. Nowadays, MOFs are of great importance and a continuously attracting family of PMs to guest a variety of substrates. Zeolitic imidazolate frameworks (ZIFs) are an outstanding class of MOFs, constructed from tetrahedrally configured transition metal cations linked through bridging imidazolate (Im) spacers. ZIFs are structurally isiomorphic to zeolites. since the metal-Im-metal angle is similar to the Si–O–Si angle (145°) in the latter compounds. This feature was exploited to produce a huge variety of porous transition metal-based ZIFs. Our initial goal was to combine Im and alkali metal borohydrides in the same structure with the formation of porous borohydride compounds, where Im serves as a structural unit of the framework, while borohydride anions provide with functionality (i.e. efficient host -guest interactions through the hydridic H–). Surprisingly, we found that alkali and alkaline earth metal-based imidazolates, to the best of our knowledge, are not structurally characterized so far, although they are usually generated in situ followed by the metathesis reaction with transition metal salts to produce corresponding ZIFs. This might be explained both by their general unavailability and by efficient hydrolysis under mild conditions. Thus, the coordination chemistry of Im towards alkali and alkaline earth metal cations remains a challenge. With this in mind and inspired by the fascinating storage properties of ZIFs, we have turned our attention to Im-based coordination compounds with Li+, Na+, K+ and Mg2+ as well as determination of their structures. During my presentation, I will report on the synthesis, characterization and crystal structures of complexes of Li+, Na+, K+ and Mg2+, and Im and ImH.
Dr. Damir SAFIN is currently a chief expert of the Scientific expertise unit of the R&D department (NIOST LLC) of the SIBUR holding (the biggest company in Eastern Europe for gas processing and petrochemicals), and is in charge of scientific expertise of projects addressed to the SIBUR holding, scientific collaboration with Universities and Research centers as well as joint PhD students. Before joining the SIBUR holding Dr. SAFIN was a post doctoral research associate in the University of Muenster (Germany), University of Cologne (Germany), University of Rostock (Germany), University of Ottawa (Canada) and Universite catholique de Louvain (Belgium, two stays). Research interests of Dr. SAFIN cover a broad range of chemistry: analytical chemistry, inorganic chemistry, coordination chemistry, phosphororganic chemistry, supramolecular chemistry, macrocyclic compounds, metallocomplexes, nanomaterials, luminescent materials, magnetic materials, catalysis, materials for hydrogen and energy storage, Metal-Organic Frameworks. Dr SAFIN is a co-author of more than 150 papers in scientific journals, with an h-index of 21.
All faculty, researchers and graduate students are invited to attend.
There will be a get-together with refreshments at 10:45-11:00 a.m.