화학과 특별 세미나가 내일(8월 1일) 오전 11시에 개최됩니다.

많은 참여 부탁드립니다.

제  목 : Defective chemistry through the eyes of nuclear spins: unlocking the detective potential of NMR

연  사 : 이정재 박사(School of Earth and Environmental Sciences, 서울대학교)

일  시 : 2023년 8월 1일(화) 오전 11시

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Defective chemistry through the eyes of nuclear spins: unlocking the detective potential of NMR

                                                       Jeongjae Lee

                                    School of Earth and Environmental Sciences

                                                Seoul National University

In mathematics and physics, many chemical structures can often be elegantly described in terms of their periodicity and/or symmetry. In chemistry and materials science, however, the interesting properties of many solid materials are determined by their non-periodic, i.e., defective, nature. NMR spectroscopy, which relies on the interaction of nuclear spins with their immediate chemical environments, provides an excellent probe into the structure and dynamics of these defects, which are often challenging to investigate by other structural techniques.

In this talk, I will highlight some of our recent investigations in materials chemistry involving solid-state NMR spectroscopy as the primary tool. Topics covered include: structure and electronic doping of 2-dimensional metal-halide perovskites[1,2], surface functionalization and interface phenomena in metal-halide perovskites[3,4], and ion dynamics in Mg-ion battery cathode material Mg3Bi2[5,6].

[1] “Bulk Incorporation of Molecular Dopants into Ruddlesden–Popper Organic Metal–Halide Perovskites for Charge Transfer Doping”, Adv. Funct. Mater. In press.

[2] “Layer-by-Layer Structural Identification of 2D Ruddlesden–Popper Hybrid Lead Iodide Perovskites by Solid-State NMR Spectroscopy”, Chem. Mater. 33, 370 (2021).

[3] “Ligand-Engineered Bandgap Stability in Mixed-Halide Perovskite LEDs”, Nature 591, 72 (2021).

[4] “Mechanochemistry-driven engineering of 0D/3D heterostructure for designing highly luminescent Cs–Pb–Br perovskites”, Nat. Commun. 13, 4263 (2022).

[5] “An Ab Initio Investigation on the Electronic Structure, Defect Energetics, and Magnesium Kinetics in Mg3Bi2”, J. Mater. Chem. A 6, 16983 (2018).

[6] “Insights into the Electrochemical Performances of Bi Anodes for Mg Ion Batteries Using 25Mg Solid State NMR Spectroscopy”, Chem. Commun 53, 743 (2017).