BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:iCalendar-Ruby BEGIN:VEVENT CATEGORIES:Lectures & Presentations DESCRIPTION:Chemistry & Biochemistry Colloquium | Cucurbit[8]uril-secured P latinum Dimers: Recognition and Applications\, Nov. 21\n\nThe Chemistry & B iochemistry colloquium series presents Dr. Eric Masson discussing "Cucurbit [8]uril-secured Platinum Dimers: Recognition and Applications" on Nov. 21 f rom 4:10 to 5:05 p.m. in Walter 145.\n\n \n\nMasson is Roenigk Chair and Pr ofessor & Department Chair of Chemistry & Biochemistry at Ohio University.\ n\n \n\nAbstract: We will discuss a new recognition motif in the Cucurbitur il (CB[n]) family\, namely the formation of CB[8]-secured head-to-head\, “s tacked” platinum terpyridyl (tpy) acetylide and thiolate dimers. Both posit ive Pt centers sit on top of each other at one CB[8] portal\, leaving the o ther void of any guest interaction.1 Favorable dispersive interactions betw een the stacked tpy ligands and possible metal-metal bonding through dz2-dz 2 orbital overlap are proposed as driving forces for the recognition patter n. We will present some self-sorting properties of these assemblies1 and us e them as catalysts for the photoreduction of water.2 We will conclude with a rather provocative study showing that the binding selectivity of CB[n]s (n = 5 – 8)\, at least when guests are hydrocarbons or noble gases\, can be predicted by mimicking the macrocycles with hard-sphere solvents with low polarities and low polarizabilities and “pre-formed” cavities.3\n\n \n\n\n\ nFigure 1. (a) Enhanced photoreduction of water catalyzed by a CB[8]-secure d platinum dimer. (b) Orientation-specific self-assembly of Pt(II) acetylid es with CB[8]. (c) “Dual layer” self-sorting between Pt thiolates and CB[8] . (d) A CB[8]-secured oligopeptide “pendant necklace”. (e) Cucurbiturils mi micked by low polarizability solvents with pre-formed cavities: an empirica l model to predict hydrocarbon selectivity.\n\n \n\nReferences\n\nKotturi K .\, Masson\, E. Eur. J. 2018\, 24\, 8670 – 8678\; b) Barbero\, H.\, Thomps on\, N. A.\, Masson\, E. J. Am. Chem. Soc. 2020\, 142\, 867 – 873\; c) Barb ero\, H.\, Masson\, E.\, Chem. Sci. 2021\, 12\, 9962 – 9968.Rabbani\, R.\, Saeedi\, S.\, Nazimuddin\, Md.\, Barbero\, H.\, Kyritsakas\, N.\, White\, T . A.\, Masson\, E. Sci. 2021\, 12\, 15347 – 15352.Rabbani\, R.\; Nazimuddi n\, Md\; Barbero\, H.\; Masson\, E. Chem. Sci. 2022\, 13\, 438 DTEND:20221121T220500Z DTSTAMP:20240921T075346Z DTSTART:20221121T211000Z GEO:39.322732;-82.10287 LOCATION:Walter Hall\, 145 SEQUENCE:0 SUMMARY:Chemistry & Biochemistry Colloquium | Cucurbit[8]uril-secured Plati num Dimers: Recognition and Applications\, Nov. 21 UID:tag:localist.com\,2008:EventInstance_41065288676043 URL:https://calendar.ohio.edu/event/chemistry_biochemistry_nov_21 END:VEVENT END:VCALENDAR