Month: January 2023

New SmCG Phases in a Hydrogen-Bonded Bent-Core Liquid Crystal Featuring a Branched Siloxane Terminal Group was written by Chen, Wei-Hong;Chuang, Wei-Tsung;Jeng, U-Ser;Sheu, Hwo-Shuenn;Lin, Hong-Cheu. And the article was included in Journal of the American Chemical Society in 2011.Recommanded Product: 35065-86-2 This article mentions the following:

The authors synthesized three analogous bent-core mols., a H-bonded complex and a covalent-bonded compound with branched siloxane units (H-SiO and C-SiO, resp.) and a H-bonded complex with an alkyl unit (H-Alk), and studied the effects of the H bonding and branched siloxane terminal units on their mesomorphic properties. The covalent-bonded compound C-SiO and the H-bonded complex H-Alk exhibited typical SmCP phases; in contrast, the H-bonded complex H-SiO exhibited general tilt smectic (SmCG) phases with highly ordered layer structures (i.e., SmCG̃₂P_F-USmCG₂P_A-SmCG₂P_F-SmCGP_F upon cooling). During the SmCG-type phase transition process, a 2-dimensional-modulated ribbon structure transferred into highly ordered layers via undulated layers, as the H-bonding strength increased with reduced temperatures As the SmCG domains were aligned under d.c. elec. fields, a gradual decrease in the leaning angle from ∼60° to 50° (while the tilt angle kept at ∼31°) could be determined by in situ wide-angle x-ray scattering (WAXS). Combined with FTIR and Raman spectroscopic data, the authors’ results suggest that the change in the leaning angle was governed by the competition of the H bonds and microsegregation of siloxane units within the bilayer structure of the H-bonded complex H-SiO. The ferroelec.-(antiferroelec.)-ferroelec. transitions proven by the switching current responses in the SmCG-type phases of H-SiO reveal that the polar switching occurred through collective rotations around the long axis of H-SiO. Therefore, novel SmCG phases with highly ordered 2-dimensional-structures were induced by the effects of the H bonding and branched terminal siloxane unit in the bent-core H-bonded LC complex H-SiO. In the experiment, the researchers used many compounds, for example, 3-Bromophenyl acetate (cas: 35065-86-2Recommanded Product: 35065-86-2).

3-Bromophenyl acetate (cas: 35065-86-2) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Recommanded Product: 35065-86-2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Determination of reactivity by molecular orbital theory. Part 84. Theoretical studies of the effects of ortho-methyl substitution on S_N1 and S_N2 processes at primary and secondary benzylic carbons was written by Lee, Ikchoon;Kim, Nam Doo;Kim, Chang Kon. And the article was included in Journal of Physical Organic Chemistry in 1993.HPLC of Formula: 83902-02-7 This article mentions the following:

The effects of o-Me substitution on the transition-state (TS) structure and reactivity of S_N1 and S_N2 processes were investigated for primary and secondary benzyl (α-tert-butyl) derivatives MO theor. using the AM1 method. The o-Me groups have both stabilizing (by electron donation) and destabilizing (steric) effects on the S_N2 TS; the former prevails for the primary whereas the latter effects becomes dominant for the secondary compounds In contrast, complex interplay of the two effects are operative in the S_N1 TS of both primary and secondary derivatives leading to the reactivity order which is consistent with that observed by solvolytic experiments, o,o’-dimethyl < H < o-Me. The bond length-reactivity rule applies only for the primary benzyl S_N2 series for which steric effects are insignificant. For reactions of benzyl derivatives is general the coplanarity between the carbenium sp² center and the benzene ring, π-σ_c-x^*, is most important in stabilizing TS structure for which other structural requirements may be relaxed. In the experiment, the researchers used many compounds, for example, 2-(Bromomethyl)-1,3-dimethylbenzene (cas: 83902-02-7HPLC of Formula: 83902-02-7).

2-(Bromomethyl)-1,3-dimethylbenzene (cas: 83902-02-7) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.HPLC of Formula: 83902-02-7

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Efficient deep-blue organic light-emitting diodes employing difluoroboron-enabled thermally activated delayed fluorescence emitters was written by Li, Guijie;Zhan, Feng;Lou, Weiwei;Wang, Dan;Deng, Chao;Cao, Lina;Yang, Yuning;Zhang, Qisheng;She, Yuanbin. And the article was included in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2020.Formula: C8H8Br2 This article mentions the following:

The design and development of efficient emitters for deep-blue OLEDs with CIE_y < 0.10 remains a challenge. A new series of tetracoordinated difluoroboron (BF₂)-enabled thermally activated delayed fluorescent (TADF) materials with D-A-BF₂-type and D-π-A-BF₂-type frameworks for sky-blue to deep-blue emitters were designed and developed. The emission colors could be effectively tuned through regulating the degree of conjugation between the HOMO (HOMO) and LUMO (LUMO) by simply introducing a Me group into the Ph ring to adjust the mol. geometries and change the acceptor moieties, which were strongly supported by the d. functional theory (DFT) calculations and electrochem. studies. All the tetracoordinated difluoroboron TADF emitters are air-stable and insensitive to moisture, and they are strongly emissive in degassed toluene peaking at 435-471 nm with high photoluminescence quantum efficiencies (PLQYs) of 94-99%. The BF2-MPCz-doped sky-blue OLED demonstrated a peak EQE of 13.8% with a L_max value of 20853 cd m^-2 and CIE coordinates of (0.175, 0.354), and the BF2-DMCz-doped deep-blue OLED achieved a peak EQE of 8.4% with CIE coordinates of (0.149, 0.083). This indicates that the BF₂-enabled TADF materials can act as efficient emitters for the fabrication of sky-blue to deep-blue OLEDs. In the experiment, the researchers used many compounds, for example, 2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2Formula: C8H8Br2).

2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Formula: C8H8Br2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Chemoselective Preparation of “Clickable” Aryl Sulfonyl Fluoride Monomers:A Toolbox of Highly Functionalized Intermediates for Chemical Biology Probe Synthesis was written by Fadeyi, Olugbeminiyi;Parikh, Mihir;Chen, Ming;Kyne, Robert Jr.;Taylor, Alexandria;O’Doherty, Inish;Kaiser, Stephen;Barbas, Sabrina;Niessen, Sherry;Shi, Manli;Weinrich, Scott L.;Kath, John;Jones, Lyn;Robinson, Ralph Pelton. And the article was included in ChemBioChem in 2016.COA of Formula: C6H4BrFO2S This article mentions the following:

Sulfonyl fluoride (SF)-based activity probes have become important tools in chem. biol. Herein, exploiting the relative chem. stability of SF to carry out a number of unprecedented SF-sparing functional group manipulations, we report the chemoselective synthesis of a toolbox of highly functionalized aryl SF monomers that we have used to quickly prepare SF chem. biol. probes. In addition to SF, the monomers bear an embedded click handle (a terminal alkyne that can perform copper(I)-mediated azide alkyne cycloaddition). The monomers can be used either as fragments to prepare clickable SF analogs of drugs (biol. active compounds) bearing an aryl ring or, alternatively, attached to drugs as “minimalist” clickable aryl SF substituents. In the experiment, the researchers used many compounds, for example, 3-Bromobenzene-1-sulfonyl fluoride (cas: 454-65-9COA of Formula: C6H4BrFO2S).

3-Bromobenzene-1-sulfonyl fluoride (cas: 454-65-9) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.COA of Formula: C6H4BrFO2S

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Synthesis of some metabolites of meclozine was written by Goenechea, Sabino;Brzezinka, Harald;Glanzmann, Gerda;Ruecker, Gerhad;Neugebauer, Michael. And the article was included in Archiv der Pharmazie (Weinheim, Germany) in 1989.COA of Formula: C8H7BrO2 This article mentions the following:

The meclozine (I, R = Ph, R¹ = Me) metabolites I [R = Ph, R¹ = CO₂H, CONH₂, CONHCH₂CH₂SO₃H; R = 3,4-MeO(HO)C₆H₃, R¹ = CO₂H] and the mono- and di-N-oxides of I (R = Ph, R¹ = Me) were prepared In the experiment, the researchers used many compounds, for example, 3-(Bromomethyl)benzoic acid (cas: 6515-58-8COA of Formula: C8H7BrO2).

3-(Bromomethyl)benzoic acid (cas: 6515-58-8) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.COA of Formula: C8H7BrO2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Development of a new class of hole-transporting and emitting vinyl polymers and their application in organic electroluminescent devices was written by Mutaguchi, Daisuke;Okumoto, Kenji;Ohsedo, Yutaka;Moriwaki, Kazuyuki;Shirota, Yasuhiko. And the article was included in Organic Electronics in 2003.Recommanded Product: 162258-89-1 This article mentions the following:

A new class of hole-transporting vinyl polymers, poly{4-vinyl-4′-[bis(4′-tert-butylbiphenyl-4-yl)amino]biphenyl} (PVBAB) and poly{4-vinyl-4′-[N,N-bis(9,9-dimethylfluoren-2-yl)amino]biphenyl} (PVFAB), and a new emitting vinyl polymer, poly(2-{4-[4-vinylphenyl(4-methylphenyl)amino]phenyl}-5-dimesitylborylthiophene) (PVPhAMB-1T), were designed and synthesized. These new vinyl polymers form smooth amorphous films with high glass transition temperatures of ca. 200 °C. PVBAB and PVFAB possess electron-donating properties, and PVPhAMB-1T possesses bipolar character with both electron-donating and accepting properties, exhibiting strong fluorescence in solution and as films. Organic electroluminescent devices using PVBAB or PVFAB as a hole-transport layer and N,N’-dimethylquinacridone-doped tris(8-quinolinolato)aluminum as an emitting layer were thermally stable and exhibited very high performance. The use of PVPhAMB-1T as an emitting material also permitted the fabrication of a high-performance, green-emitting organic EL device. In the experiment, the researchers used many compounds, for example, 4-Bromo-4′-tert-butylbiphenyl (cas: 162258-89-1Recommanded Product: 162258-89-1).

4-Bromo-4′-tert-butylbiphenyl (cas: 162258-89-1) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Recommanded Product: 162258-89-1

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Inclusion of triphenylamine unit in dopant-free hole transport material for enhanced interfacial interaction in perovskite photovoltaics was written by Lee, Ji Hyeon;Jang, Min Ho;Lee, Chan Hee;Lee, Jae-Joon;Lee, Sae Youn;Jo, Jea Woong. And the article was included in Dyes and Pigments in 2022.HPLC of Formula: 128-08-5 This article mentions the following:

Dopant-free hole transport material (HTM) has been recognized as an essential material for achieving efficient and stable perovskite photovoltaics (PPVs). Currently, conjugated polymer has emerged as a promising dopant-free HTM; however, its insufficient interaction with perovskite absorbers limits an efficient interfacial passivation and charge extraction when employed in PPVs. In this study, we developed a high-performance dopant-free HTM by the partial substitution of a conjugated polymer with triphenylamine unit. The anal. of the performance of the HTM revealed that the modification of the polymer HTM using triphenylamine unit enhanced its interaction with perovskite and its passivation ability. Furthermore, an increase in the number of face-on orientated crystallites after the triphenylamine substitution enhanced the charge transport ability of the polymer HTM. Consequently, the PPVs fabricated using the triphenylamine-substituted polymer HTM exhibited a high efficiency of 20.4% and an enhanced long-term stability compared to the devices fabricated using a control polymer without triphenylamine-substitution (15.8%). In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5HPLC of Formula: 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.HPLC of Formula: 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Interchain hydrogen-bonded conjugated polymer for enhancing the stability of organic solar cells was written by Yang, Nam Gyu;Jeon, Sung Jae;Kim, Young Hoon;Lee, Hyoung Seok;Hong, Dong Hyun;Moon, Doo Kyung. And the article was included in Journal of Industrial and Engineering Chemistry (Amsterdam, Netherlands) in 2022.Application In Synthesis of 1-Bromopyrrolidine-2,5-dione This article mentions the following:

Operational stability of organic solar cells (OSCs) is a key issue for the commercialization. In order to enhance the stability of OSCs, various strategies are being used. In this study, pyrroles and isoindigo monomers with tert-butoxycarbonyl side chains were synthesized and used to prepare a D-A-type polymer, P(TBPyTBIID), via Stille coupling. The obtained polymer dissolved readily in organic solvents, such as chloroform. However, the formation of interchain hydrogen bonds after side-chain cleavage via thermal treatment rendered the resulting polymer insoluble in organic solvents. In addition, strong π···π stacking due to face-on orientation enabled dense packing of the structure, which led to an increase in resistances to organic solvents, acid, and UV light. P(TBPyTBIID) was introduced as a UV and external protective layer, along with silver nanoparticles, at the back surface of the glass substrate. The light-soaking stability was enhanced without significantly reducing the efficiencies of the organic solar cells. This work indicates that introducing an UV blocking layer can be an effective strategy to increase the stability of organic solar cells. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Application In Synthesis of 1-Bromopyrrolidine-2,5-dione).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.Application In Synthesis of 1-Bromopyrrolidine-2,5-dione

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Studies on prostaglandins. VI. Synthesis of 16(S)-methyl-20-methoxy-PGE₂ (YPG-209) having oral bronchodilator activity and its analogs was written by Iwamoto, Hidenori;Inukai, Noriyoshi;Yanagisawa, Isao;Ishii, Yoshio;Tamura, Toshinari;Shiozaki, Tetsuya;Takagi, Tokuichi;Tomioka, Kenichi;Murakami, Masuo. And the article was included in Chemical & Pharmaceutical Bulletin in 1980.HPLC of Formula: 4457-67-4 This article mentions the following:

16(S)-Methyl-2-methoxy-PGE₂ (I), 16(R)-methyl-2-methoxy-PGE₂ (II) and several analogs, such as 16(S)-methyl-20-methoxy-PGA₂ and -PGB₂, 16-methyl-20-ethoxy-PGE₂, 16-methyl-20-(hydroxymethyl)-PGE₂, 16-methyl-17-oxa-ω-dihomo-PGE₂, and 20-(hydroxymethyl)-PGE₂, were prepared I and II had potent oral bronchodilator activity; the bronchoselectivity of I was higher than that of II. In the experiment, the researchers used many compounds, for example, 1-Bromo-4-methoxybutane (cas: 4457-67-4HPLC of Formula: 4457-67-4).

1-Bromo-4-methoxybutane (cas: 4457-67-4) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.HPLC of Formula: 4457-67-4

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

An Isomeric Copper-Diisophthalate Framework Platform for Storage and Purification of C₂H₂ and Exploration of the Positional Effect of the Methyl Group was written by Lin, Shengjie;Fan, Lihui;Zhou, Ping;Xu, Tingting;Jiang, Zhenzhen;Hu, Simin;Chen, Jingxian;He, Yabing. And the article was included in European Journal of Inorganic Chemistry in 2021.Category: bromides-buliding-blocks This article mentions the following:

Three isostructural metal-organic frameworks (MOFs) based on dicopper paddlewheels and dimethyl-functionalized linear diisophthalate ligands were solvothermally constructed, with the aim to study their performance regarding acetylene (C₂H₂) storage as well as separation and purification and to further understand the positional effect of the weakly polarized Me functionality. Isotherm measurements and IAST selectivity analyses revealed that the three compounds exhibited the promising potential for storing C₂H₂ and recovering C₂H₂ from CO₂ (CO₂) and methane (CH₄) at ambient conditions. Also, their C₂H₂ adsorption properties can be tailored and optimized by altering the relative position of the Me substituents immobilized in the organic linkers. At 298 K and 1 atm, the C₂H₂ uptake capacities vary from 173.0 to 183.6 cm³ (STP) g^-1, while the C₂H₂/CH₄ and C₂H₂/CO₂ adsorption selectivities are at 24.5-26.6 and 4.34-4.70 for the equimolar gas mixtures The ortho-dimethyl-modified MOF outperformed better than the other two MOF isomers. Rational arrangement of functional groups can to some extent improve gas adsorption properties. Although the property discrepancy caused by the less-polar Me group is not as large as that by Lewis-basic N atoms, this is the 1st exptl. demonstration of the positional effect of Me group on C₂H₂ adsorption. In the experiment, the researchers used many compounds, for example, 2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2Category: bromides-buliding-blocks).

2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Category: bromides-buliding-blocks

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary