General

Physical Chemistry Seminar: Dr. Akbar Salam, Wake Forest

Thu, 2018-09-06 13:00 - 14:00
Speaker: 

Dr. Akbar Salam

 Molecular QED Theory of Resonance Energy Transfer 

 

 Abstract: The fundamental theory of electron-photon interactions is quantum electrodynamics (QED). Its characteristic feature is the quantisation of the electromagnetic field. One of the successes of the molecular version of QED [1,2] is the unified description it provides of resonance energy transfer (RET) [1]. This process is viewed as arising from the exchange of a single virtual photon between an initially excited donor species and a ground state acceptor moiety. Asymptotic limits of the Fermi golden rule transition rate reveal a radiationless Förster type of exchange mechanism in the near-zone that has inverse sixth power separation distance dependence, and a radiative inverse square law behaviour at large displacements.

 

 

 

In this seminar an overview of the theory of molecular QED and its application to pair RET will be given first, before recent results are presented concerning the role that one and two additional passive polarisable molecules have in modifying the transfer rate [3,4]. Insight is gained into migration of energy in an environment of bath molecules by comparing these microscopic models of RET occurring between individual particles with a polariton based approach [5] in which direct excitation energy transfer is facilitated by medium-dressed photons.

 

 

 

[1] A. Salam, Molecular Quantum Electrodynamics, John Wiley & Sons, Inc., Hoboken, 2010.

 

[2] D. L. Andrews, G. A. Jones, A. Salam and R. G. Woolley, J. Chem. Phys. 148, 040901 (2018).

 

[3] A. Salam, J. Chem. Phys. 136, 014509 (2012).

 

[4] D. L. Andrews and J. S. Ford, J. Chem. Phys. 139, 014107 (2013).

 

[5] G. Juzeliunas and D. L. Andrews, Adv. Chem. Phys. 112, 357 (2000). 

 

 

Location: 

Carol Lynch Lecture Hall

Chemistry Complex

Attached Document: 

Host: Dr. Nitzan and Subotnik

inquiries rvargas@sas.upenn.edu

Inorganic Chemistry Seminar: Dr. Yunho Lee, KAIST

Tue, 2018-08-14 12:00 - 13:00
Speaker: 

Dr. Yunho Lee

Coordination Chemistry of 1st-row Transition Metal Pincer Complexes

 Transition metal adduct formations with small molecules such as N2, H2, CO and CO2 are drawing much attention due to their importance in developing synthetic catalysts for various industrial processes. In our laboratory, a series of such species with low-valent 1st row transition metals are currently under investigation. This effort is to show their respective roles in small-molecule transformations that include the COx and NOx (x = 1 – 3) conversions for modeling ACS/CODH active site chemistry and biological denitrification processes, respectively. In this presentation, a particular study with pincer complexes (PEP)M-L (E = N, P or Si and M = Co, Ni, Cu), where the L site is occupied by various ligands such as NHR2, N2, COx and COOR will be discussed. Regarding the geometry and reactivity relationship, a (PPP)M scaffold reveals the interconversion between square planar and tetrahedral geometry in which reversible group transfer occurs between a phosphide moiety and a nickel ion via unanticipated metal-ligand cooperation. This unusual group transfer reaction is tightly coupled with metal’s local geometry and its 0/I/II redox couples. In contrast, a (PNP)M scaffold shows a selective reaction pattern occurring at the structurally rigidified nickel center. With a structurally rigidified acriPNP ligand, a T-shaped nickel(I) metalloradical species was successfully stabilized. Having a sterically exposed half-filled dx2-y2 orbital, this nickel(I) species reveals unique open-shell reactivity. Such modification is successful in selective conversion of CO2. The reduction of {(acriPNP)Ni(CO)}{BF4} also succeeded in generating mono- and zero-valent nickel carbonyl complexes. In fact, the Ni(0)-CO species reveals the selective addition of CO2 to give a nickel(II)-carboxylate species with the expulsion of CO. The closed synthetic cycle for CO2 reduction to CO was finally established with a (acriPNP)Ni system.

 


·       “Selective Transformation of CO2 to CO at a Single Nickel Center” Acc. Chem. Res., 2018, 51, 1144-1152.

·       “Direct CO2 addition to a Ni(0)-CO species allowing the selective generation of a nickel(II) carboxylate with expulsion of CO” J. Am. Chem. Soc., 2018, 140, 2179-2185.

·       “A T-Shaped Ni(I) Metalloradical Species” Angew. Chem., Int. Ed. 2017, 56, 9502.

·       “Carbon Dioxide Binding at a Ni/Fe Center; Synthesis and Characterization of Ni(η1-CO2-κC) and Ni-μ-CO2-κC:κ2O,O’-Fe” Chem. Sci. 2017, 8, 600.

·       “Phosphinite-Ni0 Mediated Formation of a Phosphide-NiII-OCOOMe Species via Uncommon Metal-Ligand Cooperation.” J. Am. Chem. Soc. 2015, 137, 4280.

Location: 

Carol Lynch Lecture Hall

Chemistry Complex

Host: Dr. Mindiola

inquiries rvargas@sas.upenn.edu

Physical Chemistry Seminar: Dr. John Mauro, Pennsylvania State University

Thu, 2018-08-30 13:00 - 14:00
Speaker: 

Dr. John Mauro

Relaxation is Everywhere
As a nonequilibrium material, a glass is continually relaxing towards its metastable supercooled liquid state.  A comprehensive understanding of glass relaxation is of critical importance for many high-tech applications of glass, including optical fiber, glass substrates for liquid crystal displays, and chemically strengthened cover glass for electronic devices.  In this presentation, I will review the current state-of-the-art in understanding the dynamics of glass relaxation, including the physical origins of its non-Arrhenius and non-exponential characters
Location: 

Carol Lynch Lecture Hall

Chemistry Complex

Host Dr. Fakhraai

inquiries rvargas@sas.upenn.edu

Organic Chemistry Seminar:Dr.Tetsuo Narumi, Shizuoka Univeristy

Fri, 2018-08-24 12:00 - 13:00
Speaker: 

Dr. Tetsuo Narumi

https://wwp.shizuoka.ac.jp/tenarumi/about-us

Title: Amide-to-Alkene Isosteric Switch Strategy: Peptidomimetic Synthesis and Their Application to Study on Amyloid Fibril Formatio

Location: 

Carol Lynch Lecture Hall

Chemistry Complex

Host: Dr. Petersson

 

 

Tom Mallouk Joining Penn Chemistry

Prof. Thomas Mallouk, who is currently the Evan Pugh University Professor of Chemistry, Biochemistry and Molecular Biology, Physics, and Engineering Science and Mechanics at Penn State University will be joining the Penn Chemistry Department as the second Vagelos Chair in Energy Research in the Department of Chemistry, effective March 2019. A member of the National Academy of Sciences, Tom is perhaps best known for his groundbreaking work leading to fundamental advances in our understanding of materials chemistry and nanoscience.

 

Megan Matthews Named Scialog CMC Fellow

Assistant Professor Megan Matthews has been named a Scialog Fellow on the Chemical Machinery of the Cell by the Research Corporation and the Gordon and Betty Moore Foundation. More information on the program can be found here.

David Christianson to be next Department Chair

David Christianson, Roy and Diana Vagelos Professor in Chemistry and Chemical Biology, will assume the role of Department Chair effective July 1, 2018. David succeeds Gary Molander, the Hirschmann-Makineni Professor of Chemistry, who has served as Chair for the past 9 years.

 

James Petersson Honored by Penn Medical School

Associate Professor James Petersson is a co-recipient of the 2018 Jane M. Glick Graduate Student Teaching Award. The award was established in 2010 by the Glick family in remembrance of Dr. Jane Glick and her dedication to the Biomedical Graduate Studies programs. The award is given to those faculty that have demonstrated a "commitment to educating and training the next generation of scientists that exemplifies the type of scientist and educator Jane Glick represented."

Corporate Recruiting Special Event

Fri, 2018-06-15 09:00 - 11:00
Speaker: 

Dr. Page McAndrew

West Pharmaceutical Services

Location: 
Room 2000 Vagelos

Resumes, Interviewing, & Industrial R&D

 

Join Penn Chemistry alum Page McAndrew (MacDiarmid group) as he offers a workshop with practical advice on job search skills for industrial positions.

 

Dissertation Defense - Wenjie Dou (Subotnik Group)

Tue, 2018-06-05 14:00 - 15:00
Location: 
Lynch Lecture Hall

MODELING NONADIABATIC DYNAMICS AT MOLECULE-METAL INTERFACES

 

Abstract:

 

Department of Chemistry

231 S. 34 Street, Philadelphia, PA 19104-6323

215.898.8317 voice | 215.573.2112 fax | web@chem.upenn.edu

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