Sung Ik Yang
Kyung Hee University · Materials Science
About the Lab
Professor Sung Ik Yang's research lab specializes in the design and synthesis of functional organic and porphyrin-based materials for molecular photonic and optoelectronic applications. The lab focuses on controlling electronic communication in conjugated systems through strategic molecular engineering, particularly in porphyrin arrays, diarylethenes, and phthalocyanine dyads. Key research directions include tuning excited-state dynamics, energy transfer, and electronic communication in these systems for potential use in light-harvesting devices, molecular switches, and organic electronics. The lab employs advanced spectroscopic and electrochemical techniques to probe structure-property relationships at the molecular level.
Research Overview
Research Output Trend
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Selected Papers
15A highly fluorescent diarylethene in the closed-ring form was synthesized by the oxidation of 1,2-bis(2-methyl-1-benzothiophene-3-yl)perfluorocyclopentene (BTF6).
The rational design of molecular photonic devices relies on the ability to select components with predictable electronic structure, excited state lifetimes and redox chemistry. Electronic communication in multiporphyrin arrays depends critically on the relative energies and electron density distributions of the frontier molecular orbitals, especially the energetically close highest occupied molecular orbitals (a 2u and a 1u ). To explore how these ground and excited state properties can be modul
The ground- and excited-state properties of a series of p -phenylene-linked porphyrin dimers have been examined using a variety of static and time-resolved spectroscopic techniques. The dimers consist of a zinc porphyrin and a free base (Fb) porphyrin (ZnFbΦ), two zinc porphyrins (Zn 2 Φ), or two Fb porphyrins (Fb 2 Φ). In each array, the porphyrins are joined by the p -phenylene linker at one meso position, with the nonlinking meso positions bearing mesityl groups. Three analogous dimers in whi
A series of diarylethenes and their disulfonyl derivatives such as 1,2-bis(2-heptyl-1-benzothiophene-3-yl)perfluorocyclopentene (HBTF6), 1,2-bis(6-acetyl-2-heptyl-1-benzothiophene-3-yl)perfluorocyclopentene (DAHBTF6), 1,2-bis(2-heptyl-1-benzothiophene-1,1-dioxide-3-yl)perfluorocyclopentene (HBTFO4), and 1,2-bis(6-acetyl-2-heptyl-1-benzothiophene-1,1-dioxide-3-yl)perfluorocyclopentene (DAHBTFO4), have been prepared for the examination of a substituent and an oxidation effect on photochromic and p
The β-diphenylethyne-linked porphyrin dimers ZnFbU-β (nonlinking meso -mesityl substituents) and F 30 ZnFbU-β (nonlinking meso -pentafluorophenyl substituents) and their bis-Zn analogues have been examined by static spectroscopic (absorption, fluorescence, electron paramagnetic resonance), time-resolved spectroscopic (absorption, fluorescence), and electrochemical (cyclic and square-wave voltammetry, coulometry) methods. The β-linked dimers were examined to test the hypothesis that the nature of
Free base, zinc and magnesium mono-ethynyl phthalocyanines have been prepared as building blocks for constructing phthalocyanine-containing molecular devices. The phthalocyanine building blocks were prepared by the statistical reaction of 4,5-diheptylphthalonitrile and 4-(3-hydroxy-3-methylbut-1-ynyl)phthalonitrile, followed by chromatographic separation and subsequent deprotection. Seven porphyrin–phthalocyanine dyads in various metalation states have been prepared (M1PM2Pc; M1, M2 = Zn2+, Mg2+
The photophysical properties of two perylene−porphyrin dyads have been examined in detail with the aim of expanding the functional utility of these constructs for molecular optoelectronics applications. The dyads consist of a perylene-bis(imide) dye (PDI) connected to either a magnesium porphyrin (Mg) or a free base porphyrin (Fb) via a diphenylethyne (pep) linker. The photophysical behavior of these two dyads show both similarities and differences to one another and to the dyad containing a zin
A novel infinite coordination polymer (DAE-ICP) based on zinc nitrite and a diarylethene photoswitch, with reversible photochromic properties in solution and the solid state upon applying photostimuli, was synthesized and characterized by FT-IR, EDX, FE-SEM and FE-TEM.
New perylene–porphyrin dyads have been designed that exhibit superior light-harvesting and energy-utilization activity compared with earlier generations of structurally related dyads. The new dyads consist of a perylene mono(imide) dye (PMI) connected to a porphyrin (Por) via an ethynylphenyl (ep) linker. The PMI–ep–Por arrays were prepared with the porphyrin as either a zinc or magnesium complex (Por = Zn or Mg) or a free-base form (Por = Fb). The absorption properties of the perylene complemen
High fatigue-resistant photochromic dithienylethenes were synthesized by controlling the oxidation state of 1,2-bis(2-methyl-1-benzothiophene-3-yl)perfluorocyclopentene (BTF6) and 1,2-bis(2,5-dimethylthien-3-yl)perfluorocyclopentene (DMTF6).
Research Areas
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