Month: October 2022

Cheng, Cong; Jiang, Yongshi; Wang, Haonan; Lou, Weiwei; Zhu, Yunhui; Deng, Chao; Wang, Dan; Tsuboi, Taiju; Li, Guijie; Zhang, Qisheng published their research in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021. The article was titled 《Efficient and stable deep blue thermally activated delayed fluorescent molecules based on a bipyridine acceptor core》.HPLC of Formula: 3764-01-0 The article contains the following contents:

High efficiency and low cost organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescent (TADF) materials have attracted great attention. However, combining high quantum efficiency and stability is still challenging for deep blue TADF OLEDs. Here, we report a type of novel blue TADF emitter consisting of a bipyridine weak acceptor and four carbazole donors. These D-A-type emitters exhibit a high fluorescence rate of 9.8 x 107 s-1 and a small ΔEST of 0.08 eV owing to the energy approach of the frontier orbitals on the isolated D/A segments and adequate overlap of the frontier orbitals in the D-A systems. The organic light-emitting diodes containing these emitters offer deep blue emission with a half-width of 58 nm. High external quantum efficiencies of 15.3% and 18.7% are achieved in devices with emission maxima at 459 nm and 471 nm, resp. In comparison to the structurally analogous TADF emitters with a π-bridge between the donor and acceptor moieties, the bipyridine/carbazole derivatives with a compact “”donors-surrounding-acceptor”” structure exhibit superior stability in both photoluminescence and electroluminescence. The experimental process involved the reaction of 2,4,6-Trichloropyrimidine(cas: 3764-01-0HPLC of Formula: 3764-01-0)

2,4,6-Trichloropyrimidine(cas: 3764-01-0) is a member of organic chlorides. Organic chloride content in crude oil can be detected through specialized laboratory analysis. Care and attention are essential while sampling and testing.HPLC of Formula: 3764-01-0

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

In 2017,Xiang, Yepeng; Zhao, Yongbiao; Xu, Nan; Gong, Shaolong; Ni, Fan; Wu, Kailong; Luo, Jiajia; Xie, Guohua; Lu, Zheng-Hong; Yang, Chuluo published 《Halogen-induced internal heavy-atom effect shortening the emissive lifetime and improving the fluorescence efficiency of thermally activated delayed fluorescence emitters》.Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published the findings.Synthetic Route of C4HCl3N2 The information in the text is summarized as follows:

Halogenation of an electron acceptor in TADF emitters is presented as a feasible strategy for shortening the DF lifetimes of TADF emitters without sacrificing their photoluminescence quantum yields. A greenish-yellow device based on the chloride-substituted emitter (ClPPM) achieves a high external quantum efficiency of 22.2% and an ultra-slow efficiency roll-off of 12.3% at a practical luminance of 1000 cd m-2, which is comparable to the state-of-the-art device performance for green-to-yellow TADF OLEDs at the practical luminance. The results came from multiple reactions, including the reaction of 2,4,6-Trichloropyrimidine(cas: 3764-01-0Synthetic Route of C4HCl3N2)

2,4,6-Trichloropyrimidine(cas: 3764-01-0) is a member of organic chlorides. Organic chloride content in crude oil can be detected through specialized laboratory analysis. Care and attention are essential while sampling and testing.Synthetic Route of C4HCl3N2

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Pander, Piotr; Zaytsev, Andrey V.; Sil, Amit; Williams, J. A. Gareth; Lanoe, Pierre-Henri; Kozhevnikov, Valery N.; Dias, Fernando B. published an article in 2021. The article was titled 《The role of dinuclearity in promoting thermally activated delayed fluorescence (TADF) in cyclometalated, N-C-N-coordinated platinum(II) complexes》, and you may find the article in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices.Related Products of 1193-21-1 The information in the text is summarized as follows:

We present the synthesis and in-depth photophys. anal. of a di-Pt(II) complex with a ditopic bis-N-C-N ligand. The complex exhibits a dual luminescent behavior by emitting simultaneously delayed fluorescence and phosphorescence. By comparing with the mono-Pt(II) analog, we demonstrate that thermally activated delayed fluorescence (TADF) is turned on in the di-Pt(II) complex due to the occurrence of three main differences relative to the mono-Pt(II) analog: a larger singlet radiative rate constant (kSr), a smaller singlet-triplet energy gap (ΔEST) and a longer phosphorescence decay lifetime (τPH). We observe similar trends among other di-Pt(II) complexes and conclude that bimetallic structures promote conditions favorable for TADF to occur. The diplatinum(II) complex also shows a long wavelength-emissive excimer which yields near IR electroluminescence, λel = 805 nm, in a solution-processed OLED device with EQEmax = 0.51%. We believe this is the highest efficiency reported to date for an excimer Pt(II) emitter with λel > 800 nm in a solution-processed OLED device.4,6-Dichloropyrimidine(cas: 1193-21-1Related Products of 1193-21-1) was used in this study.

4,6-Dichloropyrimidine(cas: 1193-21-1) is a member of organic chlorides. Organic chloride content in crude oil can be detected through specialized laboratory analysis. Care and attention are essential while sampling and testing.Related Products of 1193-21-1

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

《Azoles and azines: CVII. Synthesis of 5H-pyrano[2,3-d:6,5-d’]dipyrimidine-2,4,6,8(1H,3H,7H,9H)-tetrones and their 2,8-dithio analogs》 was written by Moskvin, A. V.; Polkovnikova, I. I.; Ivin, B. A.. Formula: C5H6N2O3 And the article was included in Russian Journal of General Chemistry (Translation of Zhurnal Obshchei Khimii) on August 31 ,1998. The article conveys some information:

5H-Pyrano[2,3-d:6,5-d’]dipyrimidine-2,4,6,8(1H,3H,7H,9H)-tetrones were prepared by treatment with a POCl3-P2O5 mixture of pyridinium salts of 5,5′-arylmethylenebisbarbituric acids or by condensation of 6-methoxyuracil with aromatic aldehydes or formaldehyde, followed by demethylation of intermediate 4,6-dimethoxy-5H-pyrano[2,3-d:6,5-d’]dipyrimidine-2,8(1H,9H)-diones. 2,8-Dithioxo-1,2,3,4,6,7,8,9-octahydro-5H-pyrano[2,3-d:6,5-d’]dipyrimidine-4,6-diones are formed by reaction of pyridinium salts of 5,5′-arylmethylenebis(2-thiobarbituric) acids with trifluoroacetic anhydride. After reading the article, we found that the author used 6-Methoxypyrimidine-2,4(1H,3H)-dione(cas: 29458-38-6Formula: C5H6N2O3)

6-Methoxypyrimidine-2,4(1H,3H)-dione(cas: 29458-38-6) belongs to pyrimidine. Pyrimidine nucleotide derivatives have a wide range of biological applications. For example, pyrimidine derivatives are useful in DNA repair studies involving cancer and epigenetics.Formula: C5H6N2O3

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

《High-throughput identification of small molecules that affect human embryonic vascular development》 was written by Vazao, Helena; Rosa, Susana; Barata, Tania; Costa, Ricardo; Pitrez, Patricia R.; Honorio, Ines; de Vries, Margreet R.; Papatsenko, Dimitri; Benedito, Rui; Saris, Daniel; Khademhosseini, Ali; Quax, Paul H. A.; Pereira, Carlos F.; Mercader, Nadia; Fernandes, Hugo; Ferreira, Lino. Product Details of 213743-31-8 And the article was included in Proceedings of the National Academy of Sciences of the United States of America on April 11 ,2017. The article conveys some information:

Birth defects, which are in part caused by exposure to environmental chems. and pharmaceutical drugs, affect 1 in every 33 babies born in the United States each year. The current standard to screen drugs that affect embryonic development is based on prenatal animal testing; however, this approach yields low-throughput and limited mechanistic information regarding the biol. pathways and potential adverse consequences in humans. To develop a screening platform for mols. that affect human embryonic development based on endothelial cells (ECs) derived from human pluripotent stem cells, we differentiated human pluripotent stem cells into embryonic ECs and induced their maturation under arterial flow conditions. These cells were then used to screen compounds that specifically affect embryonic vasculature. Using this platform, we have identified two compounds that have higher inhibitory effect in embryonic than postnatal ECs. One of them was fluphenazine (an antipsychotic), which inhibits calmodulin kinase II. The other compound was pyrrolopyrimidine (an antiinflammatory agent), which inhibits vascular endothelial growth factor receptor 2 (VEGFR2), decreases EC viability, induces an inflammatory response, and disrupts preformed vascular networks. The vascular effect of the pyrrolopyrimidine was further validated in prenatal vs. adult mouse ECs and in embryonic and adult zebrafish. We developed a platform based on human pluripotent stem cell-derived ECs for drug screening, which may open new avenues of research for the study and modulation of embryonic vasculature. In the experiment, the researchers used many compounds, for example, 7-Cyclopentyl-5-(4-phenoxyphenyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine(cas: 213743-31-8Product Details of 213743-31-8)

7-Cyclopentyl-5-(4-phenoxyphenyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine(cas: 213743-31-8) belongs to pyrimidine. The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, including the nucleotides cytosine, thymine and uracil, thiamine (vitamin B1) and alloxan. Product Details of 213743-31-8

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

《Optimization of the carbazole-pyrimidine linking pattern for achieving efficient TADF》 was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2020. These research results belong to Serevicius, Tomas; Dodonova, Jelena; Skaisgiris, Rokas; Banevicius, Dovydas; Kazlauskas, Karolis; Jursenas, Saulius; Tumkevicius, Sigitas. Formula: C4H2Cl2N2 The article mentions the following:

A high fluorescence quantum yield is essential for achieving a high OLED efficiency. Due to their typically strong charge-transfer (CT) character, thermally activated delayed fluorescence (TADF) compounds usually have a lower prompt fluorescence efficiency, and therefore the boosting of the total emission yield (ϕPL) mostly relies on the enhancement of the delayed fluorescence efficiency. In this paper, we present a less frequently used approach for achieving a high ϕPL by maximising both prompt and delayed emission yields of carbazole-pyrimidine compounds Strong decoupling of HOMO and LUMO and the subsequent emergence of TADF were achieved by introducing four carbazole units at both meta positions of the Ph unit, though was low due to the prominent nonradiative triplet decay rate. Crowding the relatively loose carbazole units together at the para position and both meta positions, conversely, was shown to diminish the nonradiative decay, enhance the radiative decay rate and subsequently boost the fluorescence yield. Efficient blue electroluminescence with a nearly 20% yield was demonstrated for the optimized compound In the experiment, the researchers used many compounds, for example, 4,6-Dichloropyrimidine(cas: 1193-21-1Formula: C4H2Cl2N2)

4,6-Dichloropyrimidine(cas: 1193-21-1) is a member of organic chlorides. Almost all organochlorine compounds are synthesized. It is widely used as intermediates, solvents and pesticides of chemical synthetic products.Formula: C4H2Cl2N2

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Shafikov, Marsel Z.; Pander, Piotr; Zaytsev, Andrey V.; Daniels, Ruth; Martinscroft, Ross; Dias, Fernando B.; Williams, J. A. Gareth; Kozhevnikov, Valery N. published an article in 2021. The article was titled 《Extended ligand conjugation and dinuclearity as a route to efficient platinum-based near-infrared (NIR) triplet emitters and solution-processed NIR-OLEDs》, and you may find the article in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices.Related Products of 1193-21-1 The information in the text is summarized as follows:

Near IR (NIR) emission from mol. materials is typically targeted by using more extended conjugated systems compared to visible-emitting materials. But efficiencies usually fall off due to the combined effects of increasing non-radiative and lower oscillator strengths as the energy of emissive excited states decreases. Efficient NIR-emitting organic light emitting diodes (OLEDs) are rare compared to the huge progress that has been made for visible-light devices. For organometallic emitters that contain a heavy metal ion to promote phosphorescence through the effect of enhanced spin-orbit coupling (SOC), the problem is typically exacerbated by decreased metal character in the Sn and T1 excited states as the conjugation in a bound ligand increases. Here we show how the use of a dinuclear metal complex with an extended conjugated ligand allows such effects to be mitigated compared to analogous structures with just one metal center. The complex Pt2(bis-dthpym)(dpm)2 (complex 5) is readily prepared by a double NĈ cyclometallation of 4,6-bis(dithienyl)-pyrimidine (H2bis-dthpym), with the coordination sphere of each Pt center being completed by OÔ-coordinating dipivaloylmethane (dpm). This new complex displays intense NIR emission in solution, λmax = 725 nm, with essentially no “”contamination”” by visible light <700 nm. The photoluminescence quantum yield of 0.17 in toluene at 300 K is vastly superior to that of the analogous mononuclear complex, where reduced SOC leads primarily to ligand-based fluorescence and only very weak phosphorescence. Computational results indicate that a key reason for the superior performance of the dinuclear system is a doubling of the number of higher-lying excited singlet states with which the T1 state may couple, to promote the formally forbidden phosphorescence process. Complex 5 has been evaluated as an NIR emitter in solution-processed OLEDs. An external quantum efficiency (EQE) of 3.6% is attained using 5 doped into TBP:PBD at 5% weight/weight, with a turn-on voltage of 5.6 V (at 0.01 mW cm-2). The maximum radiosity of 2.7 mW cm-2 for this device is particularly high compared to most reported NIR-emitting phosphorescent OLEDs.4,6-Dichloropyrimidine(cas: 1193-21-1Related Products of 1193-21-1) was used in this study.

4,6-Dichloropyrimidine(cas: 1193-21-1) is a member of organic chlorides. Organic chloride content in crude oil can be detected through specialized laboratory analysis. Care and attention are essential while sampling and testing.Related Products of 1193-21-1

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Ivanovskaya, L. Yu.; Derendyaev, B. G.; Baram, S. G. published an article on February 28 ,1982. The article was titled 《Mass spectra of pyrimidine derivatives. V. Methoxy- and dimethylaminopyrimidines》, and you may find the article in Izvestiya Sibirskogo Otdeleniya Akademii Nauk SSSR, Seriya Khimicheskikh Nauk.Name: 2-Methoxy-5-nitropyrimidine The information in the text is summarized as follows:

The mass spectra of I (R = H, F, Cl), II (R = H, F; R1 = H, F, Cl), III, IV (R = F, Cl), V, and VI (R = H, Cl; R1 = H, Me, MeO, F, Cl, NO2) were analyzed. In the case of VI (R = H), electron-donating R1 substituents favored cleavage of a C-H bond in the OMe group, whereas electron-withdrawing R1 favored loss of CH2O. The experimental part of the paper was very detailed, including the reaction process of 2-Methoxy-5-nitropyrimidine(cas: 14001-69-5Name: 2-Methoxy-5-nitropyrimidine)

2-Methoxy-5-nitropyrimidine(cas: 14001-69-5) is a member of ether. Friedel Crafts reaction, for example, adds an alkyl or acyl group to aromatic ethers when they react with an alkyl or acyl halide in the presence of a Lewis acid as a catalyst.Name: 2-Methoxy-5-nitropyrimidine

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

《Synthesis and thermal transformations of 5-nitropyrimidin-4-yl dialkyldithiocarbamates》 was written by Ryabova, O. B.; Makarov, V. A.; Chernyshev, V. V.; Granik, V. G.. Application In Synthesis of 4-Chloro-6-methoxy-5-nitropyrimidine And the article was included in Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya) on April 30 ,2004. The article conveys some information:

On heating, 5-nitropyrimidin-4-yl dialkyldithiocarbamates undergo two types of transformations. One type of these transformations involves intramol. ipso-substitution of the nitro group to form bis(4-dialkylcarbamoylthiopyrimidin-5-yl) disulfides, whereas another type of transformations involves elimination of carbon disulfide to give 4,6-diamino-5-nitropyrimidine derivatives The reaction pathway is controlled by the steric effect of the substituent at position 6 of the pyrimidine ring.4-Chloro-6-methoxy-5-nitropyrimidine(cas: 52854-14-5Application In Synthesis of 4-Chloro-6-methoxy-5-nitropyrimidine) was used in this study.

4-Chloro-6-methoxy-5-nitropyrimidine(cas: 52854-14-5) is a member of organic chlorides. Organic chlorides are compounds containing a carbon-chlorine bond, which are widely used in the oil field as a wax dissolver. They are generally not present in crude oils and are typically the result of additives, cleaning solutions or chemicals used for oil recovery.Application In Synthesis of 4-Chloro-6-methoxy-5-nitropyrimidine

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Mustafin, A. G.; Suyundukova, M. V.; Gataullin, R. R.; Spirikhin, L. V.; Abdrakhmanov, I. B.; Tolstikov, G. A. published an article in Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). The title of the article was 《Transformations of β-D-xylofuranosyl nucleosides. The effective synthesis of 2′,3′-dideoxy-2′,3′-didehydrothymidine》.SDS of cas: 122567-97-9 The author mentioned the following in the article:

We have shown earlier that heating 1-(2′-O-tosyl-3′,5′-di-O-benzoyl-β-D-xylofuranosyl)thymine with NaI leads to a mixture of 2,2′-anhydronucleoside and 5′-O-benzoyl-2′,3′-dideoxy-2′,3′-didehydrothymidine. We now continue our search for efficient methods of introducing a double bond at position 2′,3′ of the sugar moiety and found that the reaction of a 2,2′-anhydro compound with HI in anhydrous 1,2-dimethoxyethane leads to a 2′,3′-didehydronucleoside. The experimental part of the paper was very detailed, including the reaction process of ((2S,5R)-5-(5-Methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-2,5-dihydrofuran-2-yl)methyl benzoate(cas: 122567-97-9SDS of cas: 122567-97-9)

((2S,5R)-5-(5-Methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-2,5-dihydrofuran-2-yl)methyl benzoate(cas: 122567-97-9) belongs to pyrimidine. Pyrimidine nucleotide derivatives have a wide range of biological applications. For example, pyrimidine derivatives are useful in DNA repair studies involving cancer and epigenetics.SDS of cas: 122567-97-9

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia