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Start Over Author "Lee, Eunji" Journal chemistry - a european journal
14 results on '"Lee, Eunji"'

3. Pillar[5]‐bis‐thiacrown: An Adaptive Tricyclic Host Selectively Recognizing an Organic Guest by Dimetalation.

Author

Lee, Eunji, Ryu, Hyunsoo, Ju, Huiyeong, Kim, Seulgi, Lee, Ji‐Eun, Jung, Jong Hwa, Kuwahara, Shunsuke, Ikeda, Mari, Habata, Yoichi, and Lee, Shim Sung

Subjects
*METALATION, *SILVER compounds, *MOLECULAR recognition, *ALKANES, *CRYSTAL structure
Abstract

Some biological receptors change their shapes and rigidity by metalation to recognize substrates precisely via adaptive guest binding process. Herein we present a semi‐flexible tricyclic host molecule whose conformation is rigidified by dimetalation to uptake organic guests selectively. Considering two metal binding sites and an empty space between them, pillar[5]‐bis‐thiacrown (L) was synthesized. The tricyclic host L forms a disilver(I) complex [Ag2L(NO3)2], with an Ag⋅⋅⋅Ag separation of 9.976 Å. Binding studies based on 1H NMR including 2D NOESY and DOSY experiments towards α,ω‐dicyanoalkanes [CN(CH2)nCN, n=2–6, shortly C2–C6] demonstrated that the dimetalated L, Ag2L preferentially recognizes C2 over other guests than that of free L. Furthermore, the dimetalated the host only uptakes C2 in the presence of other guests. Crystal structures support the idea that the space between two silver(I) centers plays a decisive role on the selective guest binding forming an Ag‐C2‐Ag@L arrangement via the length‐selective recognition. This work demonstrates the chemical example of the adaptive guest binding and presents a new perspective on the metallosupramolecules of pillararenes. Selective uptake: This work presents a semi‐flexible tricyclic pillar[5]‐bis‐thiacrown, the conformation of which is rigidified by dimetalation to uptake organic guests selectively. [ABSTRACT FROM AUTHOR]

Published
2019
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14. Molar-Ratio-Dependent Supramolecular Isomerism: AgI Coordination Polymers with Bis(cyanobenzyl)sulfides.

Author

Lee, Eunji, Kim, Ja‐Yeon, Lee, Shim Sung, and Park, Ki‐Min

Subjects
*CHEMICAL research, *SUPRAMOLECULAR polymers, *ISOMERISM, *COORDINATION polymers, *CHEMICAL reactions, *LIGANDS (Chemistry)
Abstract

The ratio is the key: On varying the molar ratio of the reactants, AgNO3 and tridentate m‐L ligand, supramolecular isomers 1 and 2 comprising a 2D polymeric network were obtained. Conformational differences of m‐L play a crucial role in the 2D network structures adopted for isomers 1 and 2. [ABSTRACT FROM AUTHOR]

Published
2013
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