16232-01-2Relevant articles and documents
Substituted 2,4-Di(pyridin-2-yl)pyrimidine-Based Ruthenium Photosensitizers for Hydrogen Photoevolution under Red Light
Rupp, Mira T.,Auvray, Thomas,Shevchenko, Natali,Swoboda, Lukas,Hanan, Garry S.,Kurth, Dirk G.
, p. 292 - 302 (2021)
The photocatalytic reduction of water to form hydrogen gas (H2) is a promising approach to collect, convert, and store solar energy. Typically, ruthenium tris(bipyridine) and its many derivatives are used as photosensitizers (PSs) in a variety of photocatalytic conditions. The bis(terpyridine) analogues, however, have only recently gained attention for this application because of their poor photophysical properties. Yet, by the introduction of electron-donating or -withdrawing groups on the terpyridine ligands, the photophysical and electrochemical properties can be considerably improved. In this study, we report a series of nonsymmetric 2,6-di(pyridin-2-yl)pyrimidine ligands with peripheral pyridine substituents in different positions and their corresponding ruthenium(II) complexes. The presence of the pyrimidine ring stabilizes the lowest unoccupied molecular orbital, leading to a red-shifted emission and prolonged excited-state lifetimes as well as higher luminescence quantum yields compared to analogous terpyridine complexes. Furthermore, all complexes are easier to reduce than the previously reported bis(terpyridine) complexes used as PSs. Interestingly, the pyridine substituent in the 4-pyrimidine position has a greater impact on both the photophysical and electrochemical properties. This correlation between the substitution pattern and properties of the complexes is further investigated by using time-dependent density functional theory. In hydrogen evolution experiments under blue- and red-light irradiation, all investigated complexes exhibit much higher activity compared to the previously reported ruthenium(II) bis(terpyridine) complexes, but none of the complexes are as stable as the literature compounds, presumably because of an additional decomposition pathway of the reduced PS competing with electron transfer from the reduced PS to the catalyst.
Coordination-driven self-assembly of anthraquinone-based metal-organic cages for photocatalytic selective [2 + 2] cycloaddition
Cui, Yong,Jiang, Hong,Jin, Yao,Liu, Yan,Tang, Xianhui,Zhang, Wenqiang
supporting information, p. 8533 - 8539 (2021/06/28)
Visible-light-promoted [2 + 2] cycloaddition provides a straightforward and efficient way to produce cyclobutanes, which are the core skeleton in commercial pharmaceuticals and fine chemicals. However, the control of the conformation to producesyn-head-to
Synthesis, characterization and biological application of pyrazolo[1,5-a]pyrimidine based organometallic Re(I) complexes
Bhatt, Bhupesh S.,Pandya, Juhee G.,Patel, Mohan N.,Pathak, Chandramani,Vaidya, Foram U.,Varma, Reena R.
, p. 957 - 969 (2020/10/02)
The neutral rhenium(I) complexes (I-VI) of type [ReCl(CO)3Ln] {where L1 = 7-phenyl-5-(pyridin-2-yl)pyrazolo[1,5-a] pyrimidine, L2 = 7-(4-bromophenyl)-5-(pyridin-2-yl)pyrazolo[1,5-a]pyrimi- dine, L3 =
Design and development of a heterogeneous catalyst for the michael addition of malononitrile to 2-enoylpyridines: Influence of the primary amide decorated framework on catalytic activity and selectivity
Markad, Datta,Khullar, Sadhika,Mandal, Sanjay K.
supporting information, p. 12547 - 12554 (2019/10/11)
For the Michael addition of malononitrile to 2-enoylpyridines, we report the first heterogeneous catalyst, {[Zn2(2-bpbg)(fum)2]·4H2O·EtOH}n (1) (where 2-bpbg = N,N′-bis(2-pyridylmethyl)-1,4-diaminobutane-N,N′-di
Synthesis and characterization of a new ditopic bipyridine-terpyridine bridging ligand using a Suzuki cross-coupling reaction
Zibaseresht, Ramin
, p. 277 - 287 (2020/02/13)
Synthesis of a new bridging ligand 4'-{4-[(2,2'-bipyridin)-4-yl]-phenyl}-2,2':6'-2''-terpyridine (I) was reported. A Suzuki cross-coupling reaction was conducted for the preparation of such ligand in two different routes either between 4'-(4-bromophenyl)-2,2':6'-2''-terpyridine and 2,2'-bipyridyl-4-boronic acid or 4'-(4-boronatophenyl)-2,2':6',2''-terpyridine and 4-bromo-2,2'-bipyridine. Br HO OH B + N N N N N N N HO OH B Br N + N N N (I) N N N N
Isomeric spiro-[acridine-9,9′-fluorene]-2,6-dipyridylpyrimidine based TADF emitters: Insights into photophysical behaviors and OLED performances
Ganesan, Paramaguru,Chen, Deng-Gao,Liao, Jia-Ling,Li, Wei-Cheng,Lai, Yi-Ning,Luo, DIan,Chang, Chih-Hao,Ko, Chang-Lun,Hung, Wen-Yi,Liu, Shun-Wei,Lee, Gene-Hsiang,Chou, Pi-Tai,Chi, Yun
supporting information, p. 10088 - 10100 (2018/10/15)
TADF molecules with a higher horizontal-dipole ratio have recently been realized to show a large conversion efficiency in organic light-emitting diodes (OLEDs) and hence great promise for their application in display and solid state lighting sources. The
Halo-substituted chalcones and azachalcones-inhibited, lipopolysaccharited-stimulated, pro-inflammatory responses through the TLR4-mediated pathway
Shih, Tzenge-Lien,Liu, Ming-Hwa,Li, Chia-Wai,Kuo, Chia-Feng
, (2018/03/21)
A series of B-ring, halo-substituted chalcones and azachalcones were synthesized to evaluate and compare their anti-inflammatory activity. Mouse BALB/c macrophage RAW 264.7 were pre-treated with 10 μg/mL of each compound for one hour before induction of i
Half Sandwich Rhodium(III) and Iridium(III) Complexes as Cytotoxic and Metallonuclease Agents
Vekariya, Pankajkumar A.,Karia, Parag S.,Bhatt, Bhupesh S.,Patel, Mohan N.
, p. 1 - 14 (2018/07/21)
Half sandwich complexes of the type [(η5-C5Me5)M(L1–3)Cl]Cl.2H2O were synthesized using [{(η5-C5Me5)M(μ-Cl)Cl}2], where M = Rh(III)/Ir(III) and L1–3 = pyrim
Reinvestigation of synthesis of halo-substituted 3-phenyl-1-(2-pyridyl)-2-propen-1-ones (azachalcones). A tandem reaction for formation of penta-substituted cyclohexanols
Li, Chia-Wai,Shen, Tzu-Hsuan,Shih, Tzenge-Lien
, p. 4644 - 4652 (2017/07/11)
A systematic study of the synthesis of halo-substituted azachalcones was conducted. During the reaction course, we obtained not only the target azachalcones, but also penta-substituted cyclohexanols, which are seldom reported in the literatures. The forma
Solvent-free enantioselective conjugate addition and bioactivities of nitromethane to Chalcone containing pyridine
Zhang, Guoping,Zhu, Chun,Liu, Dengyue,Pan, Jianke,Zhang, Jian,Hu, Deyu,Song, Baoan
, p. 129 - 136 (2016/12/23)
A series of chiral thioureas derived from quinine were tested as catalysts in the enantioselective Michael additions of nitromethane to α,β-unsaturated ketones containing pyridine. The best results were obtained with the bifunctional catalyst prepared from 3,5-di(trifluoromethyl)-aniline under solvent-free conditions. This thiourea promoted the reaction with high enantioselectivities and chemical yields for aryl ketones. The origins of enantioselectivity were further investigated via experiment and computation. Meanwhile, the products from our reaction showed potent antibacterial activities against rice bacterial leaf blight, with the S-enantiomer performing much better than the R-enantiomer. Given the promising bioactivity of this class of molecules, our work is expected to offer important applications in developing future generations for drug design.
