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Chemistry, An Asian Journal

Gyeongyeop Han, Daehwa Hong, Bong Soo Lee, EunRae Ha, Ji Hun Park, Insung Choi, Sung Min Kang, JungKyu Lee
We demonstrated a systematic investigation on chemically functionalizable, non-biofouling agarose films over large-area glass surfaces. Agarose films, prepared with varying concentrations of agarose (aq), were activated by periodate oxidation to generate aldehyde groups at the termini of agarose chains. The non-biofouling efficacies and binding capabilities of the activated films were evaluated using protein and cellular patterning, assisted by a microarrayer, microcontact printing, and micromolding in capillaries...
February 20, 2017: Chemistry, An Asian Journal
Dai Dong, Da Fang, Hairong Li, Caixia Zhu, Xianghua Zhao, Jiewei Li, Lingzhi Jin, Linghai Xie, Lin Chen, Jianfeng Zhao, Hongmei Zhang, Wei Huang
A novel perfluoro-1,4-phenylenyl 6H-indolo[2,3-b]quinoxaline derivative (TFBIQ) was designed and synthesized via C-H direct arylation. The opto-electrical properties of the obtained TFBIQ were fully characterized by UV-vis and photoluminescence, cyclic voltammetry, film morphology and Alq3-based green organic light emitting diodes (OLEDs). Device A using 0.5 nm thick TFBIQ as the interfacial modification layer exhibits the best five advantages of device performance including the lowest minimum turn-on voltage (Von) as low as 3...
February 18, 2017: Chemistry, An Asian Journal
Xinrui Cao, Xiao-Fei Li, Zi-Zhong Zhu
Silicon carbide materials as the leading wide-bandgap semiconductor holds significant importance in semiconductor technologies. Here, diamond-like three-dimensional (3D) materials with low density but high elasticity properties have been designed from first-principles calculations. They are porous single-crystalline materials composed of sp3-hybridized Si (or Ge) and sp-type C≡C (or B≡N) linear moieties, while their stabilities are found to be comparable to the recently prepared SiC4 materials. Moreover, we find that such wide-bandgap semiconductors have strong absorption in a wide range of UV region and exhibit superlight, superflexible, and incompressible mechanical properties, and their optoelectronic and mechanical properties can be well tuned via structural modifications...
February 17, 2017: Chemistry, An Asian Journal
Masaichi Saito, Shunsuke Furukawa, Masahiro Fujita
We successfully synthesized mono- and bis-substituted polyselanylbenzenes 3 and 5 via mono- and dilithiation of hexakis(phenylselanyl)benzene (1), respectively. Introduction of various heteroatom functionalities into hexaselanylbenzene changed the electronic properties dependent on the σ-symmetric circular orbitals that were formed by the interactions between neighboring heteroatoms. In the cyclic voltammetry and theoretical studies on bis-heteroatom-substituted benzenes 5, the extent of the interactions in the circular orbitals with σ-symmetry affected the stability of the cationic species of 5...
February 16, 2017: Chemistry, An Asian Journal
Dmitri Konarev, Salavat Khasanov, Manabu Ishikawa, Yoshiaki Nakano, Akihiro Otsuka, Hideki Yamochi, Gunzi Saito, Rimma N Lyubovskaya
Reduction of aluminum(III), gallium(III) and indium(III) chloride phthalocyanines by sodium fluorenone ketyl in the presence of tetrabutylammonium cations yielded crystalline salts (Bu4N+)2[M(III)(HFl-O-)(Pc*3-)](*-)(Br-).1.5C6H4Cl2 (M = Al (1), Ga(2), HFl-O- = Fluoren-9-olato- anion) and (Bu4N+)[In(III)Br(Pc*3-)]*-.0.875C6H4Cl2.0.125C6H14 (3). The salts contain Pc(*3-) radical anions with negatively charged phthalocyanine macrocycles evidenced by the presence of intense bands of (Pc*3-) in the NIR range and noticeable blue shift of both Q- and Soret bands of phthalocyanine...
February 15, 2017: Chemistry, An Asian Journal
Markus Antonietti, Aleksandr Savateev, Sergey Pronkin, Marc Willinger, Dariya Dontsova
Highly crystalline potassium (heptazine imides) were prepared by the thermal condensation of substituted 1,2,4-triazoles in eutectic salt melts. These semiconducting salts are already known to be highly active photocatalysts, e.g. for the visible light driven generation of hydrogen from water. Herein, we show that within the solid state structure, potassium ions can be exchanged to other metal ions while the crystal habitus is essentially preserved.
February 15, 2017: Chemistry, An Asian Journal
Hiroki Iida, Kenji Ohmura, Ryuta Noda, Soichiro Iwahana, Hiroshi Katagiri, Naoki Ousaka, Taku Hayashi, Yuh Hijikata, Stephan Irle, Eiji Yashima
Novel double helices covalently-bridged by cyclic boronate esters were synthesized from complementary dimers with a m-terphenyl backbone joined by a chiral or achiral phenylene linker bearing diethyl boronates and diols, respectively. The X-ray crystallographic analysis and variable-temperature NMR and circular dichroism measurements, along theoretical calculations, revealed that the double helices function as a "molecular rotor" in which the cyclic boronate ester units rotate, yielding two stable rotamers at low temperatures...
February 14, 2017: Chemistry, An Asian Journal
Mitsuo Kira, Zhaowen Dong, Zhifang Li, Xupeng Liu, Chenting Yan, Ningka Wei, Thomas Müller
An Isolable dialkylsilylene reacts with dihydrogen in the presence of a small amount of a conventional Lewis acid (BPh3, BEt3) or a base (PPh3, PEt3, NPh3, NEt3) at low temperatures in a hydrocarbon solvent, giving the corresponding saturated dihydrosilane in high yields. Both 5/Lewis acid and Lewis base/5 pairs work as a frustrated Lewis pair (FLP) to split dihydrogen, being in accord with the amphoteric nature of the silylene.
February 13, 2017: Chemistry, An Asian Journal
Caixia Liu, Tianren Wang, Daqing Yang, Zhiqiang Li, Huanrong Li
Bridged polysilsesquioxanes (BP) show great potentials in developing lanthanide-based luminescent materials due to their capacity of loading lanthahide complexes with high concentration as well as their flexible processability. We herein report a novel BP precursor consisting of C3-symmetrical benzene central core moiety capable of sensitizing the luminescence of Eu3+ and Tb3+, and tunable full color luminescent gels were facily prepared by mixing the as-synthesized precursor and Ln3+ ions in appropriate solvents...
February 13, 2017: Chemistry, An Asian Journal
Masahiro Kawamata, Takuma Sugai, Mao Minoura, Yasuhisa Maruyama, Ko Furukawa, Cole Holstrom, Victor N Nemykin, Haruyuki Nakano, Yoshihiro Matano
The first examples of NH-bridged and pyrazine-fused metallodiazaporphyrin dimers were prepared from nickel(II) and copper(II) complexes of 3-amino-5,15-diazaporphyrin by Pd-catalyzed C-N cross-coupling and oxidative dimerization reactions, respectively. The synergistic effects of the nitrogen bridges and meso-nitrogen atoms play major roles in enhancing the light-harvesting properties and delocalization of an electron spin over the entire π-skeletons of the metallodiazaporphyrin dimers.
February 9, 2017: Chemistry, An Asian Journal
Hayato Sugata, Kensuke Inagaki, Toshiaki Ode, Tomoki Hayakawa, Yuki Karoji, Motoaki Baba, Ryo Kato, Daiju Hasegawa, Tetsu Tsubogo, Hiromi Uchiro
The first enantioselective total synthesis of GKK1032A₂ has been achieved. The key step is the direct construction of the highly strained 13-membered macrocycle of GKK1032A₂ by an intramolecular aromatic substitution (SNAr) reaction. To the best of our knowledge, this is the first successful example of construction of a macrocycle with an aryl ether linkage utilizing an intramolecular SNAr reaction of an η6-arene chromium complex.
February 8, 2017: Chemistry, An Asian Journal
Yongfang Yang, Li Hua, Yue Zhang, Hefang Wang, Lidong Xu, Hanying Zhao
The hybrid nanocrystals---PVBA-b-PS/ZIF-8 were prepared by the growth of ZIF-8 on the surface of the self-assembled structures from poly(p-vinylbenzoic acid)-block-polystyrene. Two different morphologies---micelles and vesicles were obtained in selective solvents owing to the different ratios of PVBA to PS blocks. The structure and morphology of the PVBA-b-PS/ZIF-8 composites were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, transmission electron microscopy and scanning electron microscopy...
February 8, 2017: Chemistry, An Asian Journal
Hiroaki Watanabe, Yusuke Kamatani, Hitoshi Tamiaki
Zinc chlorophyll derivatives Zn-1~3 possessing a tertiary amino group at the C3¹ position were synthesized through reductive amination of methyl pyropheophorbide-d obtained from naturally occurring chlorophyll-a. In a concentrated CH₂Cl₂ solution as well as a diluted 10%(v/v) CH₂Cl₂-hexane solution, Zn-1 possessing a dimethylamino group at the C3¹ position showed red-shifted UV-Vis absorption and intensified exciton-coupling CD spectra at room temperature due to its dimer formation via coordination to the central zinc by the 3¹-N atom of the dimethylamino group...
February 8, 2017: Chemistry, An Asian Journal
Gary Kwok-Ming So, Gang Cheng, Jian Wang, Xiaoyong Chang, Chi-Chung Kwok, Hongxing Zhang, Chi-Ming Che
A series of dppnc- and neocuproine-based Cu(I) complexes (dppnc = 7,8-bis(diphenylphosphino)-7,8-dicarba-nido-undecaborate) are synthesized and the emission color of these Cu(I) complexes can be tuned from green to deep red via rational modification of the neocuproine ligand structure. The molecular structures of the emissive Cu(I) complexes, Cu(dppnc)-G (green emitting), Cu(dppnc)-Y (yellow emitting), and Cu(dppnc)-R (red emitting), are characterized and their electronic structures and related transition properties are elucidated by photo-physical and computational (density functional theory) studies...
February 8, 2017: Chemistry, An Asian Journal
Sangit Kumar, Moh Sattar, Vandana Rathore, Ch Durga Prasad
A transition-metal (TM) and halogen free NaOtBu-mediated oxidative cross coupling between sp3 C-H bond of oxindoles and sp2 C-H bond of nitroarenes has been developed to access 3-aryl substituted and 3,3-aryldisubstituted oxindoles in DMSO at room temperature in short time. Interestingly, sp3 C-H bond of oxindoles has also been added to styrene under TM-free conditions for the practical synthesis of quaternary 3,3-disubstituted oxindoles. Synthesized 3-oxindoles have also been further transformed into advanced heterocycles; benzofuroindoles, indoloindoles, and substituted indoles...
February 7, 2017: Chemistry, An Asian Journal
Kai Sun, Xin Wang, Chong Zhang, Yao Cheng, Hezhen Jiao, Weimin Du
A new protocol has been established for oxygen-mediated amidoselenation and amidotelluration of alkenes under mild conditions. This method provides a simple route to a series of structurally diverse β-amido-selenides and β-amido-tellurides in moderate to high yields. The wide substrate scope, good functional group tolerance, ease of large-scale preparation and potential for product derivatization make this reaction attractive for the synthesis of nitrogen-, selenium- and tellurium-containing molecules.
February 7, 2017: Chemistry, An Asian Journal
Lluis Pascual, Sameh El Sayed, Maria D Marcos, Ramón Martínez-Máñez, Felix Sancenon
Two different acetylcholinesterase (AChE)-capped mesoporous silica nanoparticles (MSNs), S1-AChE and S2-AChE, were prepared and characterized. MSNs were loaded with rhodamine B and the external surface was functionalized with either pyridostigmine derivative P1 (to yield solid S1) or neostigmine derivative P2 (to obtain S2). The final capped materials were obtained by coordinating grafted P1 or P2 with AChE's active sites (to give S1-AChE and S2-AChE, respectively). Both materials were able to release rhodamine B in the presence of diisopropylfluorophosphate (DFP) or neostigmine in a concentration-dependent manner via the competitive displacement of AChE through DFP and neostigmine coordination with the AChE`s active sites...
February 7, 2017: Chemistry, An Asian Journal
Kirill V Zaitsev, Viktor A Tafeenko, Yuri F Oprunenko, Anastasia V Kharcheva, Zhaisan Zhanabil, Yerlan Suleimen, Kevin Lam, Vladimir B Zaitsev, Anna V Zaitseva, Galina S Zaitseva, Sergey S Karlov
The optical (UV/vis absorbance, fluorescence in solid state and in solution) and semiconducting properties of a number of di- and trigermanes and related silicon and tin containing germanes, 1-6 ((p-Tol)3GeGeMe3 (1), Ph3SnGe(SiMe3)3 (2), (C6F5)3GeGePh3 (3), (p-Tol)3GeSiMe2SiMe3 (4), (p-Tol)3GeGeMe2Ge(p-Tol)3 (5), (p-Tol)3GeSiMe2SiMe2Ge(p-Tol)3 (6)) were investigated. Molecular structures of 5 and 6 were studied by X-ray diffraction analysis. All compounds displayed luminescence properties. In addition, a band gap (of about 3...
February 6, 2017: Chemistry, An Asian Journal
Parthasarathi Dastidar, Rumana Parveen, Bommagani Sravanthi
A new series of primary ammonium monocarboxylate (PAM) salts of a non-steroidal-anti-Inflammatory-drug (NSAID) namely Tolfenamic acid (TA) and its β-alanine derivative was generated; nearly 67% of the salts in the series showed gelling ability with various solvents including water (biogenic solvent) and methyl salicylate (typically used for topical gel formulations). Gels were characterized by table top and dynamic rheology, electron microscopy etc. Structure-property correlation based on single crystal and powder X-ray diffraction data of several gelator and non-gelator salts revealed intriguing insights...
February 2, 2017: Chemistry, An Asian Journal
Vijay Nair, Jagadeesh Krishnan, Balaraman Vedhanarayanan, Sasidhar B S, Sunil Varughese
An NHC-mediated synthesis of pyrrolo[2,1-a]isoquinoline and indolizine derivatives with potential biological activity is reported. The preliminary photophysical studies of these compounds reveal that they have potential application in the sensing of Volatile Organic Compounds (VOCs).
February 1, 2017: Chemistry, An Asian Journal
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