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Synthesis of novel dinuclear europium dye complex for their optical properties
( Uma Ravi Sankar Arigala ),( Min Su Park ),( Kuk Ro Yoon ) 한국화상학회 2010 한국화상학회지 Vol.16 No.4
A novel organic ligand, 9,11,20,22-tetraaza tetrapyrido pentacene (TATPP), and the corresponding europium complex, [Eu2 (TTA)6(TATPP)] have been designed and synthesized. The results showed that [Eu2 (TTA)6(TATPP)] was a conjugated complex, emitting remarkably strong red luminescence. The lifetimes of 5D0 of Eu3+ in the complex were examined using time-resolved spectroscopic analysis; the lifetime values were 3.25x106M) Eu2 (TTA)6(TATPP) ethanol solution, respectively. Thermo gravimetric analysis showed the europium complex had good thermal stability.
그래핀 옥사이드 표면에 di nuclear europium complexes가 도입된 하이브리드 소재 합성
( Uma Ravi Sankar Arigala ),임병철 ( Byung Chul Lim ),윤옥자 ( Yoon Ja Ok ),이내응 ( Nae Eung Lee ),윤국로 ( Kuk Ro Yoon ) 한국화상학회 2012 한국화상학회지 Vol.18 No.4
유러피언(Eu) 착물을 이용하여 산화 그래핀 시트와 비공유 결합방법을 이용하여 제조 하였으며, 산화 그래핀(GOS)뿐만 아니라 혼합된 각각의 물질의 특성을 유러피언(Eu) 착물의 흡착을 확인하였다. 또한, 하이브리드 산화 그래핀(GOS)-유러피언(Eu) 착물의 최종 생성물은 생물학적 labeling과 anti-counterfeiting등 여러 실용적인 분야에 적용 가능한 밝은 적색의 발광을 방출하는 물질이다. Graphene oxide sheets (GOSs) functionalized with Europium complex was prepared using a noncovalent approach. The adsorption of Europium complexes onto GOSs, as well as the individual nature of the hybrids, was confirmed. The GOS-Europium complex hybrids and their dispersion can emit bright red luminescence, which makes them useful in many practical fields, such as biological labeling and anti-counterfeiting.
Sankar, Arigala Uma Ravi,Ko, Sangwon,Chae, Min Kyung,Lee, Jungkyu K.,Lee, Chulhyun,Yoon, Kuk Ro American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.8
<P>We demonstrate a dendritic Gd(III)-DTPA derivative [Gd-DTPA-tris(2-aminoethyl) amine-D2-4Glc(OH)], containing glycoside moieties, for magnetic resonance imaging contrast agents. In vitro relaxometry and in vivo MRI studies show that the novel Gd complex can be a potential candidate for a contrast agent because of the enhanced relaxivity and tissue-selectivity, compared to the Gd(III)-DTPA complex. Thus, we envision that the dendritic modification, employed in this work, provides insight into the design of a promising candidate for novel medical contrast agents.</P>
Molecular structure of bent-shaped liquid crystal dimers
윤국로,Bong-Keun So,Kyung-Hwan Kim,Soo-Min Lee,Uma Ravi Sankar Arigala,Ok-Byung Choi,Hwan Myung Lee,Jin-Young Lee,김성조,Eun-Hee Cha,Eun Hye Lee,박주훈 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Liquid crystalline behavior of dimesogenic compounds opens a new area of research in liquid crystals science. The term ‘dimesogenic compounds’ describes thermotropic compounds consisting of two mesogenic units linked through a central spacer such as polymethylene and oligosiloxyl groups. The two mesogenic units may or may not be identical. When they are identical, they are occasionally called twin or siamese compounds.