• 멤브레인
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• 제24권6호
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• pp.417-422
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• 2014

본 연구에서는 Poly(ethylene oxide) (PEO)/Ag Nanoparticles (NPs)/7,7,8,8-Tetracyanoquinodimethane (TCNQ) 분리막 시스템을 제조하여 기존의 PEO/Ag NPs/p-Benzoquinone (p-BQ) 복합체 분리막보다 더 향상된 성능을 보이는 고투과성올레핀 촉진수송 나노복합체 분리막을 얻고자 하였다. 고분자 지지체 PEO와 은 나노 입자 전구체 $AgBF_4$는 1 대 0.4 몰비로 고정하고 전자 수용체인 TCNQ 함량은 다양하게 조절하였으며 1/0.4/0.004 몰비에서 가장 높은 올레핀 분리막 성능을 확인하였다. 따라서 이 비율에서 long-term test를 진행하였고 초반에는 투과도 약 23 GPU, 선택도 약 6 (프로필렌/프로판)의 수치를 보였으나 32시간 만에 투과도는 약 6 GPU, 선택도는 약 2 (프로필렌/프로판)로 감소하는 것을 확인하였다.

• 멤브레인
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• 제29권5호
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• pp.246-251
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• 2019

올레핀/파라핀 분리를 위해 silver nanoparticle을 운반체로 이용하는 촉진수송막이 최근 많은 관심을 받고 있다. 기존 연구에서는 silver nanoparticle의 전구체로서 $AgBF_4$가 사용되어 왔다. 하지만 상대적으로 고가에 속하는 $AgBF_4$는 상업화에 적합하지 않기 때문에 비교적 저렴한 $AgClO_4$를 전구체로 이용해 제조된 silver nanopaticle를 활용해서 PEBAX-5513/AgNPs(전구체: $AgClO_4$)/7,7,8,8-tetracyanoquinodimethane (TCNQ) 복합막이 제조되었다. 그러나 여러 조성의 복합막이 제조되었으나 올레핀 분리성능은 관찰되지 않았다. FT-IR 분석 결과는 PEBAX-5513 고분자 내에서 silver nanoparticle이 형성되고 TCNQ에 의해 표면이 양극성화 되는 것을 확인하였지만 형성된 silver nanoparticle이 안정화 되지 못한 것으로 분석되었다. 이러한 결과들을 통해 은염 전구체의 음이온이 올레핀/파라핀 분리막에서 중요한 역할을 하는 것으로 판단되었다.

• 약학회지
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• 제43권4호
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• pp.437-441
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• 1999

Enoxacin[1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-\piperazinyl)-1,8-naphthyridine-3-carboxylic acid, ENX] is a new quinolone antibacterial agent. The method is based on the highly colored charge-transfer complex formation of this drug as a $\pi$-electron donor with 7,7,8,8-tetracyanoquinodimethane(TCNQ) or chloranil(CL) as $\pi$-acceptors. The colored products were measured spectrophotometrically at 842 nm and 552 nm for TCNQ and CL, respectively. The different experimental conditions are optimized. The linearities for TCNQ and CL were $1.6{\;}\mu\textrm{g}/mL~32{\;}\mu\textrm{g}/mL$ and $6.4{\;}\mu\textrm{g}/mL~160{\;}\mu\textrm{g}/mL$, respectively and colors were produced in non-aqueous media. This report describes a simple and ra\pid method for the analysis of enoxacin.

• Bulletin of the Korean Chemical Society
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• 제33권10호
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• pp.3448-3450
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• 2012

• 폴리머
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• 제30권3호
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• pp.224-229
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• 2006

3-Aminopropyldimethylethoxysilane (AS)과 methyliodide를 이용하여 4차 암모늄 실란을 제조하고 7,7,8,8-tetracyanoquinodimethane (TCNQ)과 methyliodide 및 요오드화 리튬을 이용하여 $Li^+TCNQ^-$를 제조하였다. 제조한 4차 암모늄 실란에 $Li^+TCNQ^-$를 가하여 4차 암모늄 실란-TCNQ adduct(ST)를 제조하고 이를 말단에 OH기를 갖는 poly(dimethylsiloxane) (PDMS)과 축합반응시켜 poly(dimethylsiloxane)-ST adduct(PST)를 제조하였다. PST 변성 말레화 폴리에틸렌(PST-g-MPE)은 말레화 폴리에틸렌과 PST를 internal mixer(Rheomix 600P)를 사용하여 용융중합으로 제조하였으며 여기에 카본블랙 (CB)의 함량을 변화시켜 PST-g-MPE/CB 및 MPE/CB 복합체를 제조하였다. 제조한 복합체의 열적 특성을 측정한 결과 유사한 열분해 온도를 나타내었다. PST-g-MPE/CB 복합체의 인장강도는 카본블랙의 함량 증가에 따라 $200\sim308MPa$로 증가하였으며 모폴로지를 측정한 결과 MPE/CB 복합체보다 PST-g-MPE/CB 복합체의 경우에서 카본블랙의 분산이 보다 더 잘 이루어졌음을 확인하였다.

• Bulletin of the Korean Chemical Society
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• 제29권5호
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• pp.948-952
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• 2008

The molecular association of acceptors with electron donors is studied in the highly-polar solvent $CH_3CN$. Tetracyanoquinodimethane (TCNQ) forms a stable charge-transfer complex with donor molecules such as 4- aminobiphenyl (4-AB), benzidine (BD) and 2-aminobiphenyl (2-AB) with high association constants. The complexes of TCNQ with 4-AB or BD show new absorption bands at around 800 and 500 nm, which can be identified as reduced $TCNQ^{{\bullet}-}$ and $TCNQ^{2-}$ species, respectively. These bands grow quickly upon photoirradiation, implying that the charge-transfer complexes are easily formed in an excited state. Conversely, a small spectral manifestation of the charge transfer was observed in the case of 2-AB complex. It is demonstrated that the structural orientation between the geminate ion pairs could play an important role in building a stable complex.

• Bulletin of the Korean Chemical Society
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• 제9권3호
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• pp.167-171
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• 1988

Formation of intermolecular charge-transfer complexes between 7,7,8,8-tetracyanoquinodimethane (TCNQ) and two different series of stilbene derivatives has been studied spectroscopically at $25^{\circ}$C in 1,2-dichloroethane. The compounds of Series I include stilbene and derivatives which have fused phenyl rings on one end of the central ethylene structure and a phenyl ring on the other end. The other Series, II, is comprised of stilbenes which have various para substituents on one of the two phenyl rings. The equilibrium constant, $K_c^{AD}$ and the molar extinction coefficient, ${\varepsilon}_{\lambda}^{AD}$, were determined using the Scott equation. The values of the charge-transfer transition frequency, ${\vu}_AD$ and $K_c{AD}$ correlated well respectively with the ionization potentials of the fused rings of Series Ⅰ or of the compounds of Series II and with the values of ${\sigma}_p$, the Hammett constants of the Series II substituents. trans-4-N,N-Dimethylaminostilbene and trans-4-nitrostilbene were found to be able to participate in electron transfer reaction with TCNQ forming the corresponding anion radical, TCNQ$^-$:

• Bulletin of the Korean Chemical Society
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• 제23권12호
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• pp.1754-1758
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• 2002

Tetrathiafulvalene(TTF) reacts with $PdCl_2,Pd(NO_3)_2$ and $Pd(hfacac)_2$(hexafluoroacetylacetonate) in ethanol to give $(TTF)_{1.5}PdCl_2$ (1a), $(TTF)_3Pd(NO_3)_2$ (1b) and $(TTF)_4Pd(hfacas)_2$ nd (1c), respectively. $PdCl(TCNQ)_{2.5}{\cdot}CH_3OH(2a)$was obtained from the reaction of $PdCl_2$ with LiTCNQ in methanol via the partial replacement of $Cl^-$ in $PdCl_2$ by $TCNQ^-$anion, whereas the total substitution of the labile $NO_3^-$ in $Pd(NO_3)_2$ yielded pd(TCNQ)·$CH_3OH$ (2b). $Pd(hfacac)_2(TCNQ)_2\cdot3CH_3OH$ (2c) was obtained from $Pd(hfacac)_2$ and LiTCNQ in methanol. The prepared compounds were characterized by spectroscopic (IR, UV, XPS) methods and magnetic (EPR, magnetic susceptibility) studies. The powdered electrical conductivities (${\sigma}_{rt}$) of the prepared compounds at room temperature were about~$10^{-7}S{\cdot}cm^{-1}$. The effective magnetic moments were lass than the spin-only value of one unpaired electron and no EPR signals from Pd metal ions were observed in any of the compounds, indicating that the Pd ions were diamagnetic and the magnetic moments arose from$(TTF)_n$ or $(TCNQ)_n$ moieties. The experimental evidences revealed that the charge transfer had occurred form $(TTF)_n$ moiety to the central Pd metal ion in 1a, 1b and 1c. Thus the TTF donors were ions in 2a and 2b were diamagnetic Pd(II) oxidation state. In contrast, the Pd metal ion was oxidized to Pd(IV) state in 2c as a result of an addition of $TCNQ^-$anion to $Pd(hfacac)_2$ in methanol. The oxidation states of the Pd metal ions were confirmed using the x-ray photoelectron spectroscopy.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1413-1415
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• 2005

The OTFT performance depends strongly on the interfacial properties between an organic semiconductor and ${\alpha}$ metal electrode. The contact resistance is critical to the current flow in the device. The contact resistance arises mainly from the Schottky barrier formation due to the work function difference between the semiconductor and electrodes. We doped pentacene/source-drain interfaces with $F_4TCNQ$ (2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane), resulting in p-doped region at the SD contacts, in order to solve this problem. We found that the mobility increased and the threshold voltage decreased.

• 멤브레인
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• 제28권4호
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• pp.265-270
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• 2018

이전 연구에서 올레핀/파라핀 분리를 위해 poly(ethylene oxide)(PEO)/Ag nanoparicles (AgNPs)(전구체$AgBF_4$)/p-benzoquinone (p-BQ) 복합막이 제조되었으며, 이 복합체 분리막의 성능은 100시간까지 선택도 10과 투과도 15 GPU로 유지되는 것이 확인되었다. 하지만 전구체인 $AgBF_4$의 가격이 고가이기 때문에, 본 연구에서는 가격 측면에서 경쟁력이 있는 $AgNO_3$를 Ag nanoparticles의 전구체로 사용하여 실험을 진행하였다. 그 결과 이미 존재하고 있는 $NO_3{^-}$가 AgNPs를 감싸고 있기 때문에 분리 성능이 나오지 않는 것으로 관찰되었다. 이번 연구에서는 $AgNO_3$를 Ag nanoparticles의 전구체로 사용하여도 높은 성능을 내기 위해 전자수용체 7,7,8,8-tetracyanoquinodimethane (TCNQ)를 사용하여 PEO, polyvinyl alcohol (PVA), polyether block amide-1657 (PEBAX-1657) 고분자 복합막을 제조한 결과, 고분자와 전자수용체의 영향과는 무관하게 분리성능을 내지 못하는 것으로 분석되었으며, 이는 분리성능에 전구체의 음이온이 결정적 역할을 하는 것으로 분석되었다.