- Two blue-light excitable yellow-emitting LMOF phosphors constructed by triangular tri(4-pyridylphenyl)amine
-
Two luminescent metal-organic-frameworks (LMOFs) constructed by a molecular chromophore [tri(4-pyridylphenyl)amine] (tppa) were synthesized by solvothermal reactions and characterized by single crystal and powder X-ray diffraction, thermogravimetric analysis, optical diffuse reflection, photoluminescence spectroscopy, and internal quantum yield measurements. Both compound 1 [Zn(tppa)(ndc)·(DMF)4] and compound 2 [Zn4(tppa)2(sdc)3(NO3)2·(DMF)4·(ACN)2] (ndc = 2,6-naphthalenedicarboxylic acid, sdc = (E)-4,4′-(ethene-1,2-diyl)dibenzoic acid, DMF = dimethylformamide, ACN = acetonitrile) exhibit intense yellow emission under blue light (455 nm) excitation. The Commission International de I'Eclairage (CIE) coordinates of 1 (0.42, 0.53) and 2 (0.42, 0.54) are close to that of YAG:Ce3+ (0.41, 0.55) (λex = 455 nm). The two phosphor materials show promise for use in phosphor-converted white LEDs (PC-WLEDs).
- Wang, Fangming,Zhou, Zeyu,Liu, Wei,Zhou, Lei,Chen, Lizhuang,Li, Jing
-
-
Read Online
- A Dual-Stimuli-Responsive Coordination Network Featuring Reversible Wide-Range Luminescence-Tuning Behavior
-
We herein report a new coordination network that deforms in a smooth and reversible manner under either thermal or pressure stimulation. Concomitantly, the organic fluorophores coordinatively bound to the channel in a face-to-face arrangement respond to t
- Yao, Zhao-Quan,Xu, Jian,Zou, Bo,Hu, Zhenpeng,Wang, Kai,Yuan, Yi-Jia,Chen, Ya-Ping,Feng, Rui,Xiong, Jian-Bo,Hao, Jialei,Bu, Xian-He
-
-
Read Online
- Organization and intramolecular charge-transfer enhancement in tripodal tris[(pyridine-4-yl)phenyl]amine push-pull molecules by intercalation into layered materials bearing acidic functionalities
-
Two new intercalates of tris[4-(pyridin-4-yl)phenyl]amine (TPPA) with zirconium hydrogen phosphate and zirconium 4-sulfophenylphosphonate having formulae Zr(HPO4)2·0.21(C33H 24N4)·2.5H2O and Zr(HO 3SC6H4PO3)1.3(C 6H5PO3)0.7·0.35(C 33H24N4)·2.5H2O were prepared and characterized by thermogravimetry, IR spectroscopy, and powder X-ray diffraction. The TPPA molecule has been selected as a model tripodal push-pull system with three peripheral basic centers that may undergo protonation. Their protonation/quaternization afforded HTPPA/MeTPPA molecules with enhanced intramolecular charge-transfer (ICT), which has been documented by electrochemical measurements, UV-Vis spectra and calculated properties such as the HOMO/LUMO levels and the first and second hyperpolarizabilities. Intercalation of TPPA into layered zirconium hydrogen phosphate and zirconium 4-sulfophenylphosphonate led to its significant organization and protonation as shown by the IR spectra. From the powder X-ray data we can deduce that the TPPA molecules are placed in the interlayer space of both hosts by anchoring two peripheral nitrogen atoms to one host layer and the opposite pyridine-4-yl terminus to the other neighboring host layer. In zirconium 4- sulfophenylphosphonate, the TPPA molecules are oriented perpendicularly, while in zirconium phosphate these molecules are slanted with respect to the layers of the host. On dehydration by heating, the interlayer distance of the intercalate decreases, which indicates a further slanting of the TPPA molecules. It follows from the UV-Vis spectra that TPPA is present in both intercalates in an equilibrium of protonated and non-protonated forms. The described materials represent the first case when a tripodal push-pull system was incorporated into a system with restricted geometry with the aim to influence its optical properties. This journal is the Partner Organisations 2014.
- Melanova, Klara,Cvejn, Daniel,Bures, Filip,Zima, Vitezslav,Svoboda, Jan,Benes, Ludvik,Mikysek, Tomas,Pytela, Oldrich,Knotek, Petr
-
-
Read Online
- In Situ Spectroelectrochemical Investigations of the Redox-Active Tris[4-(pyridin-4-yl)phenyl]amine Ligand and a Zn2+ Coordination Framework
-
An investigation of the redox-active tris[4-(pyridin-4-yl)phenyl]amine (NPy3) ligand in the solution state and upon its incorporation into the solid-state metal-organic framework (MOF) [Zn(NPy3)(NO2)2·xMeOH·xDMF]n (MeOH = methanol and DMF = N,N-dimethylformamide) was conducted using in situ UV/vis/near-IR, electron paramagentic resonance (EPR), and fluorescence spectroelectrochemical experiments. Through this multifaceted approach, the properties of the ligand and framework were elucidated and quantified as a function of the redox state of the triarylamine core, which can undergo a one-electron oxidation to its radical cation. The use of pulsed EPR experiments revealed that the radical generated was highly delocalized throughout the entire ligand backbone. This combination of techniques provides comprehensive insight into electronic delocalization in a framework system and demonstrates the utility of in situ spectroelectrochemical methods in assessing electroactive MOFs.
- Hua, Carol,Baldansuren, Amgalanbaatar,Tuna, Floriana,Collison, David,D'Alessandro, Deanna M.
-
-
Read Online
- Quantitative Detection of G-Quadruplex DNA in Live Cells Based on Photon Counts and Complex Structure Discrimination
-
G-quadruplex DNA show structural polymorphism, leading to challenges in the use of selective recognition probes for the accurate detection of G-quadruplexes in vivo. Herein, we present a tripodal cationic fluorescent probe, NBTE, which showed distinguishable fluorescence lifetime responses between G-quadruplexes and other DNA topologies, and fluorescence quantum yield (Φf) enhancement upon G-quadruplex binding. We determined two NBTE-G-quadruplex complex structures with high Φf values by NMR spectroscopy. The structures indicated NBTE interacted with G-quadruplexes using three arms through π–π stacking, differing from that with duplex DNA using two arms, which rationalized the higher Φf values and lifetime response of NBTE upon G-quadruplex binding. Based on photon counts of FLIM, we detected the percentage of G-quadruplex DNA in live cells with NBTE and found G-quadruplex DNA content in cancer cells is 4-fold that in normal cells, suggesting the potential applications of this probe in cancer cell detection.
- Ji, Liang-Nian,Liu, Liu-Yi,Liu, Wenting,Mao, Zong-Wan,Wang, Kang-Nan,Xia, Xiao-Yu,Zhu, Bo-Chen
-
-
Read Online
- Multi-Component Metal-Organic Frameworks Significantly Boost Visible-Light-Driven Hydrogen Production Coupled with Selective Organic Oxidation
-
Visible-light-driven hydrogen production coupled with selective organic oxidation has attracted increasing attention, as it not only provides clean and renewable energy, but also utilizes the other half reaction to achieve some value-added organic chemicals. Metal-organic frameworks based on metal clusters and organic ligands self-assembly give a perspective on the formation of multifunctional heterogeneous photocatalyst to significantly boost visible-light photocatalytic activities under mild conditions. By incorporating two types of photoactive units, tricarboxytriphenylamine (H3TCA) and tris(4-(pyridinyl)phenyl)amine (NPy3), into a single metal-organic frameworks, a multi-component MOF Co-MIX was obtained. With the redox active metal centers enabling the photoexcitation reduction of protons into hydrogen and the photogenerated holes promoting considerable oxidation of substrates, the resulting Co-MIX exhibits high catalytic activity for the photocatalytic hydrogen production coupled with selective oxidation of benzylamine or 1,2,3,4-tetrahydroisoquinoline. Importantly, the photocatalytic experiments of single-component Co-TCA and Co-NPy3 verified the positive synergistic effects on stability and photocatalytic ability of the two ligands (H3TCA and NPy3) in one single MOF, revealing that the multi-component strategy is very important for the efficient charge separation and excellent photocatalytic activity of the catalyst.
- Duan, Chunying,He, Cheng,Jing, Xu,Li, Hanning,Yang, Yang
-
supporting information
p. 1237 - 1244
(2021/04/09)
-
- Thiocyanate ion fluorescent probe, and preparation method and application thereof
-
The invention provides a thiocyanate ion fluorescent probe. The molecular formula of the probe is C57H75N4Br3. The invention further provides a preparation method of the probe. The preparation method comprises the following steps: adding tris(4-bromo)aniline, 4-pyridine boronic acid, potassium carbonate and tetrakis(triphenylphosphine) palladium into a 1, 4-dioxane aqueous solution, reacting at 100 DEG C under the protection of N2, adding distilled water a, extracting and washing by using dichloromethane, dissolving in an ethanol aqueous solution, adding distilled water b, performing suction filtration, washing with water and petroleum ether, recrystallizing with ethanol, adding N, N-dimethylformamide for dissolving, adding 1-bromooctane, reacting at 100 DEG C, filtering, washing with acetone and petroleum ether, and drying to obtain the thiocyanate ion fluorescent probe. The invention also provides an application for identifying thiocyanate ions. The synthesis method of the thiocyanate ion fluorescent probe is simple and easy to operate, and the thiocyanate ion fluorescent probe is high in thiocyanate ion selectivity, high in specificity, real-time performance and sensitivity and has great practical significance in detection of the content of thiocyanate ions in the ecological environment.
- -
-
Paragraph 0029-0036
(2021/07/14)
-
- Positive charge-dependent cell targeted staining and DNA detection
-
The chemical structures or positive charge-guided specific cell organelles' staining was an interesting but very challenging research work. In this paper, we synthesized a series of triphenylamine (TPA) derivatives with mono-, di- and tri-pyridinium as su
- Yin, Pei,Wang, Tao,Yang, Yuan,Yin, Weidong,Zhang, Shaoxiong,Yang, Zengming,Qi, Chunxuan,Ma, Hengchang
-
supporting information
p. 18251 - 18258
(2019/12/02)
-
- Photophysical properties of acid-responsive triphenylamine derivatives bearing pyridine fragments: Towards white light emission
-
The synthesis, thermal, electrochemical, and optical properties of a series of triphenylamine derivatives bearing pyridine fragments and their trifluoroacetate salts are described. A dramatic increase in the intramolecular charge transfer is observed upon protonation, as evidenced by a significant reduction in the HOMO-LUMO gap and a red shift of both the absorption and the emission band. White photoluminescence was obtained in solution by the controlled protonation of blue emitting pyridine derivatives, which resulted in the yellow-orange emissive acidified form. In the solid state the emission color of doped polystyrene thin films could be tuned from steel blue to lawn green when the ratio of the protonated form was increased. These compounds have potential applications in the fabrication of multi-color OLEDs based on only one material.
- Tydlitát, Ji?í,Achelle, Sylvain,Rodríguez-López, Julián,Pytela, Old?ich,Mikysek, Tomá?,Cabon, Nolwenn,Robin-le Guen, Fran?oise,Miklík, David,R??i?ková, Zdeňka,Bure?, Filip
-
p. 467 - 478
(2017/07/28)
-
- Aggregation-induced emission (AIE)-active fluorescent probes with multiple binding sites toward ATP sensing and live cell imaging
-
Aggregation-induced emission (AIE)-active compounds are attractive fluorescent materials for applications in chemical and biological sensing. The AIE effect of such materials amplifies changes in the fluorescence signal due to the physical state transformation from aggregation to disaggregation, which can be employed for detecting various analytes with high sensitivity. In particular, specific bio-active analyte recognition is not only very interesting but also challenging. In this paper, we report a set of novel AIE-active fluorescent probes containing pyridiniums and boric acid groups (TPA-PP, TPA-PPA-1, TPA-PPA-2, TPA-PPA-3), which has been developed for adenosine 5′-triphosphate (ATP) recognition. These probes with two types of interaction modes and multiple connection sites toward ATP molecules are able to selectively discriminate ATP among other bioactive anions with a significant enhancement in fluorescence emission. In particular, in the application of cell imaging, as the number of positive charges and boric acid group increased further, the probes could penetrate into cells, and then enter into the nucleus very specifically. These results clearly demonstrate that the newly developed sensors are suitable for specific tracing of different cell organelles with a height visualization and retention ability. Therefore, all of them are confirmed as promising alternatives for live cell imaging in the future.
- Ma, Hengchang,Yang, Manyi,Zhang, Caili,Ma, Yucheng,Qin, Yanfang,Lei, Ziqiang,Chang, Lu,Lei, Lei,Wang, Tao,Yang, Yuan
-
supporting information
p. 8525 - 8531
(2017/11/15)
-
- Electrochemical and optical properties of a redox-active Cu(ii) coordination framework incorporating the tris(4-(pyridin-4-yl)phenyl)amine ligand
-
A new redox-active ligand, tris(4-(pyridin-4-yl)phenyl)amine (Npy 3), has been synthesised, and incorporated into the coordination framework [Cu(Npy3)Cl2]·DMF. The monoradical cation of the ligand is readily accessible, thus enabling chemical oxidation of the framework. The novel Npy3 ligand has significant potential as a structural motif for the development of multifunctional frameworks.
- Hua, Carol,Turner, Peter,D'Alessandro, Deanna M.
-
supporting information
p. 6310 - 6313
(2013/07/26)
-