Author
Jeongsik Kim
Bio: Jeongsik Kim is an academic researcher from Hokkaido University. The author has contributed to research in topics: Anthracene & Crown ether. The author has an hindex of 4, co-authored 6 publications receiving 108 citations.
Papers
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TL;DR: Novel fluorescent reagents 1 and 2 were synthesized and in the absence of metal ions, the fluorescence emissions were quite weak, but their intensities were much greater in the presence of alkaline earth metal ions.
60 citations
TL;DR: In this article, a fluorescent chemosensors with two different fluorophores (naphthalene and anthracene) at the both ends of polyether was synthesized.
19 citations
TL;DR: Both twisted intramolecular charge transfer (TICT) and photo-induced electron transfer (PET) relaxation processes of N-phenyl-9-anthrylcarboxamide derivatives can be characterized by modified substitution of the phenyl group.
19 citations
TL;DR: Results suggested that the TICT relaxation process was effectively able to control using 1( 4) and its analogues (1(5), 2(4) and 2(5)) by complex formations.
Abstract: Bi-chromophoric compounds linked to linear polyether N,N′-[oxybis(3-oxapentamethyleneoxy-2-phenyl)]-bis(1-anthracenecarboxamide) (14) and its analogues (15, 24 and 25) were synthesized. Their photochemical properties and complexation actions were investigated in acetonitrile. These fluoroionophores have shown weak emissions in the absence of guest ions, resulting in a twisted intramolecular charge transfer (TICT) quenching process (off state) of an anthracene aromatic amide moiety. After the formation of a complex with alkaline earth metal ions, a large enhancement of fluorescent intensities was obtained (on state). The efficiencies of controlling an off-on fluorescent signal using 14 and its analogues (15, 24 and 25) were larger than that of the 9-positioned analogue. These results suggested that the TICT relaxation process was effectively able to control using 14 and its analogues (15, 24 and 25) by complex formations.
10 citations
TL;DR: A fluorescent chemosensor AP1 showed specific selectivity for Mg2+ in comparison to those of Ca2+, Sr2+, and Ba2+ by three components as discussed by the authors.
Abstract: A fluorescent chemosensor AP1 showed specific selectivity for Mg2+. Fluorescence characteristics of AP1 for Mg2+ are distinguished in comparison to those of Ca2+, Sr2+, and Ba2+ by three components...
4 citations
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TL;DR: A review of the latest developments in TICT research from a materials chemistry point of view can be found in this paper, where the authors present a compact overview of the current state-of-the-art.
Abstract: Twisted intramolecular charge transfer (TICT) is an electron transfer process that occurs upon photoexcitation in molecules that usually consist of a donor and acceptor part linked by a single bond. Following intramolecular twisting, the TICT state returns to the ground state either through red-shifted emission or by nonradiative relaxation. The emission properties are potentially environment-dependent, which makes TICT-based fluorophores ideal sensors for solvents, (micro)viscosity, and chemical species. Recently, several TICT-based materials have been discovered to become fluorescent upon aggregation. Furthermore, various recent studies in organic optoelectronics, non-linear optics and solar energy conversions utilised the concept of TICT to modulate the electronic-state mixing and coupling on charge transfer states. This review presents a compact overview of the latest developments in TICT research, from a materials chemistry point of view.
728 citations
TL;DR: Two different coumarin derivatives have been connected via an imine linkage to obtain a new fluorescence signaling system where the Mg(II) ion can be detected in the presence of these ions.
Abstract: Two different coumarin derivatives have been connected via an imine linkage to obtain a new fluorescence signaling system This compound itself does not show any emission due to rapid isomerization around the C═N bond However, in the presence of a Mg(II) ion, this isomerization is stopped because of bonding to the metal ion resulting in high-intensity (∼550-fold) emission Other metal ions like Li(I), Ca(II), and Zn(II) show very little emission, while biologically relevant transition-metal ions do not show any emission In this way, the Mg(II) ion can be detected in the presence of these ions
251 citations
TL;DR: A carbonyl group was positioned between 1,8-naphthalimide and di-2-picolylamine (DPA) and played a key role of displaying fluorescence enhancements with heavy and transition metal (HTM) ions through increasing the oxidation potential of the fluorophore.
129 citations
TL;DR: Two coumarin salen-based sensors CS1 and CS2 can exhibit a pronounced fluorescence enhancement response toward Mg(2+) as high as 36-fold and 111-fold in the presence of Na(+) as a synergic trigger, which can be easily detected by the naked eye.
120 citations
TL;DR: In this paper, five new coordination polymers, namely, [Cd4(L11)2(DPP)2DMF2(SO4)2]∞ (1), [Zn2(L 11)2DPP]2Cl2] ∞ (2),[Cd(L222)(DPP)]∞(3),[Zn(L 222)CL4]-∞((CH3)2NH2]2]
Abstract: Five new coordination polymers, namely, [Cd4(L11)2(DPP)2(DMF)2(SO4)2]∞ (1), [Zn2(L11)(DPP)2Cl2]∞ (2), [Cd(L222)(DPP)]∞ (3), [Zn(L222)(DPP)]∞ (4) and {[Cd2(L222)Cl4][(CH3)2NH2]2}∞ (5), (DPP = 1,3-di(4-pyridyl)propane and DMF = N,N-dimethylformamide), were prepared by solvothermal reactions of anthracene-9,10-dicarboxylic acid (H2L11) or anthracene-1,5-dicarboxylic acid (H2L222) with CdII or ZnII ions, and were structurally characterized by IR, elemental analysis, XRPD and single crystal X-ray diffraction. Complex 1 consists of a three-dimensional (3D) network with bcu (CsCl-type) topology assembled by pillar ligands L122−−, DPP and CdII ions and has one-dimensional (1D) channels running along the a-axis. In the case of complex 2, the CdII and SO42− ions are replaced by ZnII and Cl−, resulting in a 1D ladder chain. Complexes 3 and 4 are made up of longer pillars, H2L222 instead of H2L11, and have similar 3D four-fold interpenetrating diamond frameworks. And complex 5 forms a two-dimensional (2D) (32.62.72) kagome structure after taking out the longer pillar DPP. Moreover, the luminescence properties of all the complexes and the corresponding ligands in the solid state at room temperature have been investigated.
76 citations