권오필 신명훈 2019-02 28394 https://aurora.ajou.ac.kr/handle/2018.oak/15063 학위논문(석사)--아주대학교 일반대학원 :분자과학기술학과,2019. 2 1. Introduction 1 2. Experiments 5 3. Results and Discussion 13 4. Conclusion 35 5. Reference 36 eng The Graduate School, Ajou University 아주대학교 논문은 저작권에 의해 보호받습니다. 플루오로알콕시 그룹에 의해 비평형 구조를 갖는 아로마틱 음이온의 도입을 통한 거시적 광학 비선형성 강화 Thesis 아주대학교 일반대학원 일반대학원 분자과학기술학과 2019. 2 Master I804:41038-000000028394 http://dcoll.ajou.ac.kr:9080/dcollection/common/orgView/000000028394 This study reports a design strategy for efficient organic nonlinear optical crystals with a large macroscopic optical nonlinearity. In organic ionic crystals, edge-to-face π-π interactions between the cations and the anions contribute to decrease macroscopic optical nonlinearity, because they hinder supramolecular charge-transfer propagation. However, most the benchmark nonlinear optical crystals have been planar-shaped anions based on benzenesulfonate and naphthalenesulfonate, which may lead to increase of edge-to-face π-π interactions. To reduce edge-to-face π-π interactions, non-planar-shaped benzenesulfonate anion with trifluoromethoxy group having near-orthogonal conformations on aromatic rings is introduced. 4-(trifluoromethoxy)benzenesulfonate (OCF3) anions successfully widen the distances between the cations and the anions in the crystal, which lead to decrease of edge-to-face π-π interactions between the cations and the anions. 2-(4-hydroxystyryl)-1-methylquinolin-1-ium 4-(trifluoromethoxy)benzenesulfonate (OHQ-OCF3) crystals exhibit a larger macroscopic optical nonlinearity than 2-(4-hydroxystyryl)-1-methylquinolin-1-ium 4-methylbenzenesulfonate (OHQ-T) crystals having benchmark planar-shaped benzenesulfonate anion.