• Bulletin of the Korean Chemical Society
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• 제26권10호
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• pp.1505-1511
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• 2005

The excitation energy transfer process occurring in energy donor-acceptor linked porphyrin array system is theoretically simulated using the on-the-fly filtered propagator path integral method. The compound consists of an energy donating meso-meso linked Zn(II) porphyrin array and an energy accepting 5,15-bisphenylethynylated Zn(II) porphyrin, in which the donor array and the acceptor are linked via a 1,4-phenylene spacer. Real-time path integral simulations provide time-evolution of the site population and the excitation energy transfer rate constants are determined. Simulations and experiments show an excellent agreement indicating that the path integration is a useful tool to investigate the energy transfer dynamics in molecular assemblies.

• 대한화학회지
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• 제55권3호
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• pp.335-340
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• 2011

양이온성 수용성 5, 10, 15, 20-tetrakis(N-methylpyridinium-4-yl) porphyrin (TMPyP)의 존재 하에서 음이온 계면 활성제인 sodium n-dodecyl sulfate 의 용액 특성을 전도도법, UV-vis 및 공명 빛 산란 (RLS) 분광학적 방법을 이용하여 포괄적으로 연구하였다. 그 결과에 따르면 TMPyP 농도의 증가로 SDS 용액의 임계 미셀 농도는 감소하였는데, SDS 미셀의 안정화는 미셀 표면에 존재하는 음전하의 중화 때문이다. SDS용액 내에는 자유 포르피린 단량체, 미셀에 속박된 포르피린 단량체 또는 응집체, 그리고 nonmicellar porphyrin/계면 활성제 응집체와 같은 세 종류의 TMPy종이 분명히 존재하였다. 우리의 연구 결과는 SDS가 TMPyP의 응집을 유도한다는 것을 나타내었다. 실제로 두 종류의 J-aggregations이 관찰되었는데, 하나는 미셀에 속박된 포르피린 단량체 또는 응집체였으며, 다른 하나는 nonmicellar porphyrin/계면 활성제 응집체이다. 그러나, cmc이하에서는 TMPyP가 SDS 음이온과 정전기 상호작용을 나타내었다.

• Bulletin of the Korean Chemical Society
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• 제29권3호
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• pp.693-696
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• 2008

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 가을 학술발표회 논문집
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• pp.100-103
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• 2003

The basic structure of porphyrin consists of four pyrrole units linked by four methine bridges. It reveals that the cyclic 16-atom is the preferred cyclic system for n-electron delocalization since this pathway exhibits the highest degree of bond equalization. Scheme 1 (a) shows the 16-center system is the chromogen of the porphyrins, which allows 18-electron delocalization that could produce aromatic characteristics (1,2). (omitted)

• Bulletin of the Korean Chemical Society
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• 제32권9호
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• pp.3411-3420
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• 2011

Kinetic and structural studies have been carried out on the effects of meso-tetrakis(4-sulfonatophenyl)-porphyrin ($H_2TPPS_4$) as an anionic and meso-tetrakis(3-N-methyl-pyridyl)porphyrin ($H_2TMPYP$) as a cationic porphyrin with adenosine deaminase (ADA) in 25 mM citrate/phosphate buffer, pH = 4-8, at $37^{\circ}C$ using UVvis spectrophotometry, circular dichroism (CD), fluorescence spectrophotometry as well as molecular dynamics (MD) and molecular docking. Kinetic results showed that the two porphyrins are non-competitive inhibitors. Increasing pH, increases $K_I$ and cationic porphyrin has a higher $K_I$ and lower binding constant ($K_b$) at all pH ranges. Analyzing the secondary structure revealed that both ligands decrease the secondary structure and that the anionic porphyrin is more effective.

• Bulletin of the Korean Chemical Society
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• 제29권6호
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• pp.1141-1148
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• 2008

Geometry optimizations and electronic structure calculations are reported for meso-tetraphenyl porphyrin (TPP) and a series of meso-substituted catecholic porphyrins (KP99150, KP99151, KP99152, KP99153, and KP99090) using density functional theory (DFT). The calculated B3LYP//RHF bond lengths are slightly longer than those of LSDA//RHF. The calculated electronic structures clearly show that TPP and meso-catecholic group contribute to π-electron conjugation along porphyrin ring for HOMO and LUMO, significantly reduced the HOMO-LUMO gap. The wavelength due to B3LYP energy gaps is favored with experimental value in Soret (B), and LSDA energy gaps are favored with experimental value in visible bands (Q). The electronic effect of the catecholic groups is to reduced energies of both the HOMOs and LUMOs. However, the distortion of porphyrin predominantly raises the energies of the HOMOs, so the net result is a large drop in HOMO and smaller drop in LUMO energies upon meso-substituted catecholic group of the porphyrin macrocycle as shown in KP99151 and KP99152 of Figure 5(a). These results are in reasonable agreement with normal-coordinate structural decomposition (NSD) results. The HOMO-LUMO gap is an important factor to consider in the development of photodynamic therapy (PDT).

• 한국염색가공학회지
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• 제20권5호
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• pp.23-27
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• 2008

In this work, poly(diallyldimethylammoniumchloride) (PDDAC) and meso-tetrakis(4-carboxyphenyl)porphyrin were considered to produce the self-assembly fabrication films. This method is based on the layer-by-layer (LbL) deposition produced by the electrostatic attraction between positively charged PDDAC and negatively charged porphyrin ions. The result of multilayer fabrication was discussed with the level of color strength (K/S). K/S spectra of the fabricated multilayer films showed gradual increase behaviors. In addition, the color photo images of the fabricated multilayer films showed that PDDAC and porphyrin were successfully attracted by electrostatic self-assembly forces.

• 한국광과학회:학술대회논문집
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• 한국광과학회 1999년도 학술대회지
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• pp.31-31
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• 1999

• 대한화학회지
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• 제35권5호
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• pp.569-574
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• 1991

pyrrole과 benzaldehyde 및 그 유도체로부터 meso-tetraphenylporphyrin(TPP)과 그 유도체 다섯가지를 합성한 후 이를 Co(II), Cu(II), Zn(II)의 염화물과 반응시켜 각각의 metalloporphyrin 착화합물을 만들고, 이 중 meso-tetra(p-aminophenyl)porphyrin(TNPP)을 다공성 polystyrene 수지와 반응시킨 후 여기에 Cu(II)의 염화물을 작용시켜 고분자결합 metalloporphyrin 착화합물 : Cu(Res-NH-TPP-$NH_2$)을 만들었다. 합성한 porthyrin 화합물들은 가시광선, 적외선 및 전자스핀공명 스펙트럼으로 확인하였고, 금속함량은 원자흡광 분광광도법으로 측정하였다. 합성한 porphyrin 화합물을 benzoquinone 광환원반응에 촉매로 이용한 결과, 일반적으로 유리 porphyrin보다 metalloporphyrin이, metalloporphyrin 중에는 Cu-TNPP의 촉매효과가 높았으며, 이에 고분자를 결합시키는 경우 효과가 더욱 향상됨을 알 수 있었다.

• Bulletin of the Korean Chemical Society
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• 제21권1호
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• pp.97-100
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• 2000

Acid-catalyzed porphyrin formation from meso-aryltripyrromethanes and $25-bis({\alpha}$, - hydroxyl - $\alpha$ -phenyl) methylfuran is studied. The condensation resulted in selective scrambling of tripyrromethanes when the condensation was carried out with catalytic amounts of $BF_3$ in methylene chloride. But the reaction carried out with p-TsOH or $BEt_3$ catalysts in the presence of $NH_4Cl$ in acetonitrile, single porphyrin product was isolated without scrambling of starting tripyrromethane. The yields of porphyrin in these studies were somewhat lower than those of 2+2 condensations or aldehyde-pyrrole condensations.