Month: October 2022

Zhu, Ze-Lin; Chen, Wen-Cheng; Ni, Shao-Fei; Yan, Jie; Wang, Sheng Fu; Fu, Li-Wen; Tsai, Han-Yan; Chi, Yun; Lee, Chun-Sing published their research in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021. The article was titled 《Constructing deep-blue bis-tridentate Ir(III) phosphors with fluorene-based dianionic chelates》.Electric Literature of C5H3Br2N The article contains the following contents:

High efficiency and stable blue phosphors have been a persistent pursuit in the field of organic light-emitting diodes (OLEDs). Bis-tridentate Ir(III) complexes are considered as promising alternatives because of their excellent emission efficiency and good photostability. However, the emission colors of photostable bis-tridentate Ir(III) emitters reported so far do not reach the deep blue region. Herein, fluorene is introduced in the design of blue bis-tridentate Ir(III) complexes. By modifying a fluorene-based dianionic chelate with tert-Bu, methoxy, pyrrolidinyl and triazolyl appendages, five blue emitting bis-tridentate Ir(III) phosphors were successfully designed and prepared Emissions of the new phosphors exhibited a gradual blue shift from the sky blue to the deep blue region according to the electron donating abilities of the added substituents. A deep blue OLED was successfully fabricated based on Flu-4 and presented an excellent maximum external quantum efficiency of 22.3% with CIE coordinates of (0.17, 0.19), which are comparable to the state-of-the-art deep blue phosphors. In the experiment, the researchers used 2,6-Dibromopyridine(cas: 626-05-1Electric Literature of C5H3Br2N)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Electric Literature of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《A color-tunable single molecule white light emitter with high luminescence efficiency and ultra-long room temperature phosphorescence》 were Ma, Xiao; Jia, Ling; Yang, Baozhu; Li, Jipeng; Huang, Wei; Wu, Dayu; Wong, Wai-Yeung. And the article was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021. Synthetic Route of C20H14N4 The author mentioned the following in the article:

Developing organic single mol. white light emitters (SMWLE) with high luminescence efficiency, ultra-long phosphorescence (ULP) and excitation-dependent (ED) color-tunable emission is intriguing and highly desirable from theor. research to practical application. Nevertheless, it is an extremely challenging topic. Here, it is found that three simple terpyridine-based derivatives (P1, P2 and P3) could exhibit unusual multiple emissions and interesting color-tunable emissions. In particular, P3 as the first example could simultaneously achieve bright white light emission with high quantum yield (49%), ultra-long phosphorescence (τ = 0.57 s) and ED color-tunable emission under ambient conditions. Accordingly, it can achieve novel multicolor emission including yellowish green light, white light, blue light, bluish green light and red phosphorescence light in a very wide wavelength range. Both exptl. and theor. studies reveal that such novel emission characteristics are due to the fact that P3 integrates monomer, excimer, and intermol. charge transfer (ICT) triple-mode emissions in the crystalline state. These results provide a rational strategy for the construction of SMWLE and ED color-tunable emission materials. Moreover, such simple multifunctional materials would show huge potential in displays, anti-counterfeiting, and so on. In the experimental materials used by the author, we found 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3Synthetic Route of C20H14N4)

4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Synthetic Route of C20H14N4 Pyridine has a conjugated system of six π electrons that are delocalized over the ring.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Improved antifouling and self-cleaning ability of PVDF ultrafiltration membrane grafted with polymer brushes for oily water treatment》 was written by Pourziad, Sakineh; Omidkhah, Mohammad Reza; Abdollahi, Mahdi. Synthetic Route of C12H12N2 And the article was included in Journal of Industrial and Engineering Chemistry (Amsterdam, Netherlands) in 2020. The article conveys some information:

This study focuses on the modification of com. polyvinylidene fluoride (PVDF) membranes using surface-initiated atom transfer radical polymerization (SI-ATRP) method. Poly(N-isopropylacrylamide) (PNIPAAm) was grafted from PVDF surface and then PEGMA was grafted onto the PVDF-g-PNIPAAm membrane. The aim of the research was to prepare membranes that simultaneously have antifouling and self-cleaning properties. PNIPAAm (lower block) was grafted to give the membrane temperature sensitive property and PPEGMA (upper block) was used to improve hydrophilicity. Morphol., topog. and chem. composition of the modified membranes were completely characterized. Antifouling and cleaning ability of modified membranes were investigated using synthetic oily water. Moreover, the role of PEGMA polymerization time on the membrane performance was examined PNIPAAm-b-PPEGMA modified membrane achieved 64% decrease in fouling ratio compared to unmodified PVDF membrane at best condition. The flux recovery was 99.1% for modified membrane at this condition. Furthermore, the unmodified PVDF membrane showed 91.1% oil rejection; while the modified membrane could reject 98.2% oil mols. The final flux of all modified membranes were higher than unmodified membrane. These results indicated that PNIPAAm-b-PPEGMA modified membranes have excellent fouling resistance and self-cleaning ability. In the part of experimental materials, we found many familiar compounds, such as 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Synthetic Route of C12H12N2)

4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.Synthetic Route of C12H12N2 Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Emissions from a triphenylamine-benzothiadiazole-monocarbaborane triad and its applications as a fluorescent chemosensor and a white OLED component》 were Peng, Zhixing; Zhang, Kang; Huang, Zongwei; Wang, Zaibin; Duttwyler, Simon; Wang, Yanguang; Lu, Ping. And the article was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2019. Recommanded Product: 4-Ethynylpyridine The author mentioned the following in the article:

A fluorescent D-A-D’ triad (1), composed of monocarbaborane, benzothiadiazole and triphenylamine, was synthesized. By replacing monocarbaborane with Ph, p-methoxyphenyl (PMP), or 4-pyridinyl (Py), 3 analogs were prepared for comparison. Monocarbaborane is an electron donating group based on the comparative anal. of NMR spectra and the systematic study of their photophys. properties. Triad 1 emits bright-yellow light in THF solution with the highest quantum yield and the longest decay time among these compounds It tends to form nanoparticles in aqueous THF solution The in situ generated nanoparticles might be used to detect Ag ions with high sensitivity and high selectivity. By holding the mols. via multiple CH···π interactions and electrostatic forces between the Et4N+ cation and the cage, a sheet-like arrangement of 1 is formed in the solid state with the smallest crystal d. that provides the maximum possibility of mechanofluorochromism from the crystalline to the ground form. By doping 1 in PVK, a white OLED is obtained. Crystallog. data are given. In the experimental materials used by the author, we found 4-Ethynylpyridine(cas: 2510-22-7Recommanded Product: 4-Ethynylpyridine)

4-Ethynylpyridine(cas: 2510-22-7) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Recommanded Product: 4-Ethynylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Diketopyrrolopyrrole-based multifunctional ratiometric fluorescent probe and γ-glutamyltranspeptidase-triggered activatable photosensitizer for tumor therapy》 was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2020. These research results belong to Yang, Zhicheng; Xu, Weibo; Wang, Jian; Liu, Lingyan; Chu, Yanmeng; Wang, Yu; Hu, Yue; Yi, Tao; Hua, Jianli. Electric Literature of C6H4N2 The article mentions the following:

Photosensitizers can generate highly reactive oxygen species (ROS) by light excitation, causing cell damage and apoptosis. However, conventional photosensitizers cannot kill cancer cells selectively. In this work, we report a series of diketopyrrolopyrrole (DPP)-based photosensitizers, in which DPP-py with one pyridine group exhibits superior photodynamic killing effect on tumor cells. Furthermore, by introducing 4-bromomethyl-Ph glutamic acid in DPP-py, we adopt a strategy involving the intramol. charge transfer effect to develop a multifunctional DPP-based ratiometric fluorescent probe and activatable photosensitizer DPP-GGT, which can target the tumor-related biomarker γ-glutamyltranspeptidase (γ-GT). DPP-GGT shows highly selective and obvious fluorescent changes from red to yellow for γ-GT. More importantly, DPP-GGT exhibits specific photodynamic killing effects on human hepatic cancer cells HepG2 due to the high activity of endogenous γ-GT but no marked phototoxicity toward low-γ-GT-expressing breast cancer cells MCF-7 or normal hepatocyte cells L02. The results demonstrate that DPP-GGT has great potential for the tumor-specific activatable photodynamic anticancer therapy. The experimental part of the paper was very detailed, including the reaction process of 4-Cyanopyridine(cas: 100-48-1Electric Literature of C6H4N2)

4-Cyanopyridine(cas: 100-48-1) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Electric Literature of C6H4N2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhang, Guobing; Yu, Hao; Sun, Yue; Wang, Weiwei; Zhao, Yao; Wang, Lichun; Qiu, Longzhen; Ding, Yunsheng published their research in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021. The article was titled 《Aza-substitution on naphthalene diimide-based conjugated polymers for n-type bottom gate/top contact polymer transistors under ambient conditions》.Reference of 2,5-Dibromopyridine The article contains the following contents:

Four conjugated polymers based on naphthalene diimide (NDI) as the acceptor and thiophene-phenyl-thiophene with different aza-substitutions as co-units were synthesized. The aza-substitution gradually lowered the HOMO (HOMO) and the LUMO (LUMO) energy levels. The polymer with four aza-substitutions exhibited the deepest LUMO/HOMO energy level (-4.10/-6.01 eV). Consequently, organic field-effect transistors (OFETs) based on the bottom-gate/top-contact configuration exhibited unipolar electron transport characteristics even if the devices were exposed directly to ambient conditions. Furthermore, the corresponding devices also maintained their n-type transport behavior during long-term storage in air (>300 days). This work demonstrated that the incorporation of nitrogen atoms into NDI-based conjugated polymers for further lowering the energy levels is a feasible strategy for the construction of air-stable n-type unencapsulated OFETs. After reading the article, we found that the author used 2,5-Dibromopyridine(cas: 624-28-2Reference of 2,5-Dibromopyridine)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. In industry and in the lab, pyridine is used as a reaction solvent, particularly when its basicity is useful, and as a starting material for synthesizing some herbicides, fungicides, and antiseptics.Reference of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 2-(Bromomethyl)pyridine hydrobromideIn 2019 ,《Facile synthesis and separation of E/Z isomers of aromatic-substituted tetraphenylethylene for investigating their fluorescent properties via single crystal analysis》 was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices. The article was written by Lu, Zhixiang; Yang, Shaoxiong; Liu, Xiaolan; Qin, Yu; Lu, Shuhan; Liu, Yanxiong; Zhao, Ruidun; Zheng, Liyan; Zhang, Hongbin. The article contains the following contents:

The intermol. interactions and mol. packing form of fluorescent mols. have a huge impact on their optical properties, especially for AIE mols. As a class of typical AIE mols., tetraphenylethene (TPE) and its derivatives have prominent optical properties; nevertheless, separation of mixtures of E/Z isomers is a great challenge. Herein, a series of aromatic-substituted TPE derivatives were synthesized and used to sep. mixtures of E/Z isomers by common column chromatog. with high yields, as confirmed by single crystal anal., mass spectrometry and NMR spectroscopy. The structure-property relationships of these mols. were systematically investigated by a combination of spectroscopic methods, theor. calculations and single crystal data anal. E/Z isomers exhibit many different fluorescent properties, such as AIE and mechanochromic behavior. Moreover, the position of N on the substituted pyridine ring also has an effect on the mol. stack pattern and the fluorescent properties. Collectively, our findings could not only improve the fundamental understanding of the cis/trans isomerization and photophys. properties of TPE derivatives but also provide a good strategy for designing different substituted groups that can produce various functions and have more potential applications. The experimental process involved the reaction of 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Reference of 2-(Bromomethyl)pyridine hydrobromide)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Reference of 2-(Bromomethyl)pyridine hydrobromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Journal of Materials Chemistry C: Materials for Optical and Electronic Devices included an article by Jang, Seokhoon; Lee, Kyung Hyung; Lee, Jun Yeob; Lee, Youngu. COA of Formula: C5H6BNO2. The article was titled 《Novel hole blocking materials based on 2,6-disubstituted dibenzo[b,d]furan and dibenzo[b,d]thiophene segments for high-performance blue phosphorescent organic light-emitting diodes》. The information in the text is summarized as follows:

Novel hole blocking materials (HBMs) based on 2,6-disubstituted dibenzo[b,d]furan and dibenzo[b,d]thiophene segments, 3,3′,3”,3”’-(dibenzo[b,d]furan-2,6-diylbis(benzene-5,3,1-triyl))tetrapyridine (26DBFPTPy) and 3,3′,3”,3”’-(dibenzo[b,d]thiophene-2,6-diylbis(benzene-5,3,1-triyl))tetrapyridine (26DBTPTPy), are successfully designed and synthesized for high-performance blue phosphorescent organic light-emitting diodes (PhOLEDs) for the first time. Computational simulation is used to investigate the optimal structure, orbital distribution, and physicochem. properties of both mols. Thermal, optical, and electrochem. anal. shows that 26DBFPTPy and 26DBTPTPy possess high thermal stability, deep HOMO energy levels (-7.08 and -6.91 eV), and a high triplet energy (ET) (2.75 and 2.70 eV). Blue PhOLEDs with 26DBFPTPy or 26DBTPTPy as a hole blocking layer (HBL) exhibit a low turn-on voltage (3.0 V) and operating voltage (4.5 V) at 1000 cd m-2. In addition, the blue PhOLEDs with 26DBFPTPy or 26DBTPTPy show superior external quantum efficiencies (24.1 and 23.6%) and power efficiencies (43.9 and 42.7 lm W-1). They also show a very small efficiency roll-off of about 8.5% from 100 to 1000 cd m-2. Furthermore, they exhibit improved lifetimes compared to the similarly designed HBL with a pyridine electron transport unit and a Ph core structure. In the experimental materials used by the author, we found Pyridin-3-ylboronic acid(cas: 1692-25-7COA of Formula: C5H6BNO2)

Pyridin-3-ylboronic acid(cas: 1692-25-7) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. COA of Formula: C5H6BNO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Benazzi, Elisabetta; Begato, Federico; Niorettini, Alessandro; Destro, Lorenza; Wurst, Klaus; Licini, Giulia; Agnoli, Stefano; Zonta, Cristiano; Natali, Mirco published their research in Journal of Materials Chemistry A: Materials for Energy and Sustainability in 2021. The article was titled 《Electrocatalytic hydrogen evolution using hybrid electrodes based on single-walled carbon nanohorns and cobalt(II) polypyridine complexes》.Electric Literature of C12H13N3 The article contains the following contents:

The generation of hydrogen from water represents an important task towards a carbon neutral economy. Within this context, the preparation of hybrid electrodes merging the versatility of solid-state porous substrates and the catalytic ability and tunability of mol. complexes represents a great challenge. In the present work, we report on the preparation of hybrid cathodes for the hydrogen evolution reaction (HER) through an unprecedented combination of single-walled carbon nanohorns (SWCNHs) and two novel cobalt(II) polypyridine complexes based on the tris(2-pyridylmethyl)amine (TPMA) ligand scaffold. Suitable pyrene groups are introduced in the ligand framework in different positions to provide a way for direct anchoring onto the carbonaceous substrate by exploiting non-covalent π-π interactions. The present systems behave as competent cathodes for the HER in neutral aqueous solution with overpotentials of η ~0.5 V and stable current densities (within 1 h electrolysis) up to -0.50 mA cm-2, whose exact values depend on the catalyst used and are mainly related to the resp. loading on the electrode surface. In both cases, hydrogen evolution is detected under continuous electrolysis for up to ca. 12 h leading to maximum turnover numbers (TONs) of 4700 and 9180 molH2 molCo-1 for the two different complexes. The progressive deactivation under electrolytic conditions is mainly ascribed to leaching of the metal center from the polydentate ligand, likely occurring from the competent catalytic intermediates involved in the HER. In the experiment, the researchers used many compounds, for example, Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Electric Literature of C12H13N3)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Electric Literature of C12H13N3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《A copper complex based catalytic conversion and isolation of carbonate from CO2 for the carbon sequestration process》 was published in Journal of Industrial and Engineering Chemistry (Amsterdam, Netherlands) in 2020. These research results belong to Sivanesan, Dharmalingam; Seo, Bongkuk; Lim, Choong-Sun; Kim, Hyeon-Gook. Recommanded Product: Bis(pyridin-2-ylmethyl)amine The article mentions the following:

The conversion of CO2 into value-added chems. of industrial significance is of great interest due to global warming-related concerns and the depletion of natural resources. This paper describes a mononuclear copper complex with an N3S coordination environment that can catalyze the conversion of CO2 into the carbonate anion with an ambient O2. Electrochem. studies indicate that the N3S-ligated Cu(II) complex can be reduced to Cu(I), which can subsequently generate the carbonate anion from CO2 and ambient O2. In presence of LiClO4 when the N3S-ligated complex Cu(II) is reduced to Cu(I), the complex easily releases the carbonate anion which easily precipitates as Li2CO3 in CH3CN. These studies suggest that the N3S-ligated Cu(II)/(I) complexes can be used to convert CO2 to carbonate and isolate the generated carbonate. After reading the article, we found that the author used Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Recommanded Product: Bis(pyridin-2-ylmethyl)amine)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Recommanded Product: Bis(pyridin-2-ylmethyl)amine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem