Juwon Oh
연세대학교 의예과 · 재료과학
Juwon Oh 교수의 연구실은 주로 광물리 및 반응성에 영향을 미치는 분자의 전자 구조, 특히 고리형 공轭체의 아로마티시티와 그 상태 전환 메커니즘을 중심으로 연구를 진행하고 있습니다. 특히 Hückel 및 Möbius 아로마티시티의 역전 현상(바이어드 역학설)이 흡수 및 발광 특성에 미치는 영향을 광학 스펙트로스코피와 양자역학 계산을 통해 실험적으로 규명하고 있습니다. 또한, 확장된 페로포르피린, 나노그래핀 융합 구조체, 그리고 π-전자 네트워크를 갖춘 유기 분자에서의 구조-성질 상관관계와 프로톤 조절에 의한 전자적 스위칭 메커니즘을 탐구하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Aromaticity, the special energetic stability derived from cyclic [4 n + 2]π-conjugated electronic structures, has been the topic of intense interest in chemistry because it plays a critical role in rationalizing molecular stability, reactivity, and physical/chemical properties. Recently, the pioneering work by Colin Baird on aromaticity reversal, postulating that aromatic (antiaromatic) character in the ground state reverses to antiaromatic (aromatic) character in the lowest excited triplet stat
Recently, Baird (anti)aromaticity has been referred to as a description of excited-state (anti)aromaticity. With the term of Baird's rule, recent studies have intensively verified that the Hückel aromatic [4<i>n</i> + 2]π (or antiaromatic [4<i>n</i>]π) molecules in the ground state are reversed to give Baird aromatic [4<i>n</i>]π (or Baird antiaromatic [4<i>n</i> + 2]π) molecules in the excited states. Since the Hückel (anti)aromaticity has great influence on the molecular properties and reactio
The aromaticity reversal in the lowest triplet state (T1 ) of a comparable set of Hückel/Möbius aromatic metalated expanded porphyrins was explored by optical spectroscopy and quantum calculations. In the absorption spectra, the T1 states of the Möbius aromatic species showed broad, weak, and ill-defined spectral features with small extinction coefficients, which is in line with typical antiaromatic expanded porphyrins. In combination with quantum calculations, these results indicate that the Mö
A nanographene-fused expanded carbaporphyrin (<b>5</b>) and its BF<sub>2</sub> complex (<b>6</b>) were synthesized. Single-crystal X-ray structures revealed that <b>5</b> and <b>6</b> are connected by two hexa-<i>peri</i>-hexabenzocoronene (HBC) units and two dipyrromethene or BODIPY units, respectively. As prepared, <b>5</b> and <b>6</b> both show nonaromatic character with figure-of-eight carbaoctaphyrin (1.1.1.0.1.1.1.0) cores and adopt tweezers-like conformations characterized by a partially
N-(p-Methoxycarbonylbenzyl) triazole (BTz) substituents have been introduced to Ni(II) porphyrins (NiPs), in which their modulated axial-coordination processes have been investigated. For this study, the two types of ligands, neutral pyridine versus anionic cyanide, were employed to investigate an effect of BTz substituents. The unique microenvironments given by the BTz substituents provided two different effects on the axial-coordination processes of NiPs on the ground and excited states: (1) s
The switching phenomena of conformation with π-electronic network through deprotonation-protonation processes were investigated by employing a series of 5,20-bis(α-oligothienyl) substituted hexaphyrins(1.1.1.1.1.1). They showed significant changes in the absorption and emission spectra with deprotonation, and returned to the initial state with protonation. Through NMR measurements and single crystal X-ray diffraction analysis, we found that the 5,20-bis(α-oligothienyl) substituted hexaphyrins, w
