57341-98-7Relevant articles and documents
HBC-porphyrin-close contact chromophores
Englert, Jan M.,Malig, Jenny,Zamolo, Valeria Anna,Hirsch, Andreas,Jux, Norbert
, p. 4827 - 4829 (2013)
A photo/redoxactive hexa-peri-hexabenzocoronene-porphyrin conjugate with a direct connection between the two chromophores was synthesised using a formylated hexaphenylbenzene precursor.
Syntheses, structures and efficient catalysis for C-C coupling of some benzaldehyde thiosemicarbazone complexes of palladium
Paul, Piyali,Datta, Sayanti,Halder, Sarmistha,Acharyya, Rama,Basuli, Falguni,Butcher, Ray J.,Peng, Shie-Ming,Lee, Gene-Hsiang,Castineiras, Alfonso,Drew, Michael G.B.,Bhattacharya, Samaresh
, p. 62 - 73 (2011)
Reaction of the 4-R-benzaldehyde thiosemicarbazones (denoted in general as L-R; R = OCH3, CH3, H, Cl and NO2) with trans-[Pd(PPh3)2Cl2] afforded a group of mixed-ligand complexes (denoted i
Synthesis of new styrylquinoline cellular dyes, fluorescent properties, cellular localization and cytotoxic behavior
Rams-Baron, Marzena,Dulski, Mateusz,Mrozek-Wilczkiewicz, Anna,Korzec, Mateusz,Cieslik, Wioleta,Spaczyńska, Ewelina,Bartczak, Piotr,Ratuszna, Alicja,Polanski, Jaroslaw,Musiol, Robert
, (2015)
New styrylquinoline derivatives with their photophysical constants are described. The synthesis was achieved via Sonogashira coupling using the newly developed heterogeneous nano-Pd/Cu catalyst system, which provides an efficient synthesis of high purity
Synthesis of fluorescent molecular switches based on porphyrinoids covalently linked with redox active ligands
Chauhan, Shive M. S.,Mishra, Gaurav Kumar,Nisa, Kharu,Thirumal, M.
, (2022)
5,15-bis(1-hydoxy-2,6-di-tert-butyl-phenyl)10,20-bis-(pentaphenyl-phenyl)phenyl porphyrin and its Nickel complex were synthesized. Oxidation with NOBF4 gave 5,15bis(1-oxo-2,6-ditertairy-butyl-phenyl)10,20-bis(pentaphenyl-phenyl)phenyl-porphodimethene and Ni bis(1-oxo-2,6-ditertairy-butyl-phenyl)10,20-bis-(pentaphenylphenyl)phenyl porphodimethene. The porphyrin conjugates were characterized by NMR, mass, and UV–visible spectroscopy for structural elucidation. The density functional theory studies revealed a decrease in the highest occupied and the lowest unoccupied molecular orbital (HOMO-LUMO) energy gaps in the oxo-porphodimethenes. The photochromism and fluorescence characteristics were also studied. The porphyrin moieties were found to be desirable for the reversible light-driven fluorescent molecular switches.
A Reversible Rhodamine B Based pH Probe with Large Pseudo-Stokes Shift
Bao, Guochen,Wong, Ka-Leung,Tanner, Peter A.
, p. 816 - 820 (2019)
A reversible and sensitive pH probe DPE?Rh operates by F?rster resonance energy transfer from 1,2-diphenylethyne (DPE) to Rhodamine B (Rh). In the presence of H+, the spirolactam ring of the Rhodamine B unit was opened and this resulted in ca. 1000-fold enhancement of fluorescence intensity with linear change over the pH range of 2.0 to 5.5. The F?rster resonance energy transfer offered this probe an effective excitation–emission wavelength shift of around 240 nm with about 100 % quenching of the donor emission. The response of the sensor is tolerant towards a wide range of metal ions and the sensing mechanism was deduced by 1H NMR spectrometry. This FRET-based molecule not only provides a sensitive pH probe, but also suggests an effective strategy to eliminate the interference of excitation light.
Dissymmetrical U-shaped π-stacked supramolecular assemblies by using a dinuclear CuI clip with organophosphorus ligands and monotopic fully π-conjugated ligands
Moussa, Mehdi El Sayed,Guillois, Kevin,Shen, Wenting,Rau, Rgis,Crassous, Jeanne,Lescop, Christophe
, p. 14853 - 14867 (2014)
Reactions between the U-shaped binuclear CuI complex A that bears short metal-metal distances and the cyano-capped monotopic π-conjugated ligands 1-5 that carry gradually bulkier polyaromatic terminal fragments lead to the formation of π-stacked supramolecular assemblies 6-10, respectively, in yields of 50-80 %. These derivatives have been characterized by multinuclear NMR spectroscopic analysis and X-ray diffraction studies. Their solid-state structures show the selective formation of U-shaped supramolecular assemblies in which two monotopic π-conjugated systems present large (6, 7 , and 9) or medium (8 and 10) intramolecular π overlap, thus revealing π -π interactions. These assemblies self-organize into head-to-tail π-stacked dimers that in turn self-assemble to afford infinite columnar π stacks. The ature, extent, and complexity of the intermolecular contacts within the head-to-tail π-stacked dimer depend on the nature of the terminal polyaromatic fragment carried by the cyano-capped monotopic ligand, but it does not alter the result of the self-assembling process. These results demonstrate that the dinuclear molecular clip A that bears short metal-metal distances allows selective supramolecular assembly processes driven by the formation of intra- and intermolecular short π-π interactions in the resulting self-assembled structures; thus, demonstrating that their shape is not only dictated by the symmetry of the building blocks. This approach opens perspectives toward the formation of extended π-stacked columns based on dissymmetrical and functional π-conjugated systems.
ERRγ ligand HPB2 upregulates BDNF-TrkB and enhances dopaminergic neuronal phenotype
Kim, Hyo In,Lee, Seungbeom,Lim, Juhee,Chung, Sungkyun,Koo, Tae-Sung,Ji, Yu-Geun,Suh, Young-Ger,Son, Woo Sung,Kim, Seok-Ho,Choi, Hyun Jin
, (2021)
Brain derived neurotrophic factor (BDNF) promotes maturation of dopaminergic (DAergic) neurons in the midbrain and positively regulates their maintenance and outgrowth. Therefore, understanding the mechanisms regulating the BDNF signaling pathway in DAerg
Immobilizing Pd nanoparticles on the ternary hybrid system of graphene oxide, Fe3O4 nanoparticles, and PAMAM dendrimer as an efficient support for catalyzing sonogashira coupling reaction
Tarahomi, Mehrasa,Alinezhad, Heshmatollah,Maleki, Behrooz
, (2019)
An alternative approach to develop a Pd catalyst based on dendrimer-functionalized graphene oxide for C-C cross-coupling reactions is reported. Pd@MGO-D-NH2 has been synthesized by incipient wet impregnation method. The structure of the catalyst was thoroughly characterized by a set of analytical techniques such as TEM, BET, SEM/EDS, FTIR, and elemental mapping analysis. Then, the catalytic activity of the catalyst was scrutinized for promoting sonogashira C-C coupling reaction. The results manifested that Pd@MGO-D-NH2 was able to catalyze the coupling reaction to obtain high coupling yields in short reaction time. The results of present work are hoped to aid the development of new class of heterogeneous catalysts as the high performance candidate for industrial applications.
Zeolitic imidazolate frameworks-67 (ZIF-67) supported PdCu nanoparticles for enhanced catalytic activity in Sonogashira-Hagihara and nitro group reduction under mild conditions
Gholinejad, Mohammad,Naghshbandi, Zhwan,Sansano, Jose M.
, (2022/01/11)
A bimetallic PdCu supported on amine functionalized ZIF-67 is shown to be efficient catalyst in Sonogashira-Hagihara coupling reaction of aryl iodides at room temperature and aryl bromides at 40 oC. In addition, the catalyst is used in the reduction of 4-
Pd supported on clicked cellulose-modified magnetite-graphene oxide nanocomposite for C-C coupling reactions in deep eutectic solvent
Karimi, Sabah,Masteri-Farahani, Majid,Niakan, Mahsa,Shekaari, Hemayat
, (2020/10/02)
Cellulose-modified magnetite-graphene oxide nanocomposite was prepared via click reaction and utilized for immobilization of palladium (Pd) nanoparticles without using additional reducing agent. The abundant OH groups of cellulose provided the uniform dispersion and high stability of Pd nanoparticles, while magnetite-graphene oxide as a supporting material offered high specific surface area and easy magnetic separation. The as-prepared nanocomposite served as a heterogeneous catalyst for the Heck and Sonogashira coupling reactions in various hydrophilic and hydrophobic deep eutectic solvents (DESs) as sustainable and environmentally benign reaction media. Among the fifteen DESs evaluated for coupling reactions, the hydrophilic DES composed of dimethyl ammonium chloride and glycerol exhibited the best results. Due to the low miscibility of catalyst and DES in organic solvents, the separated aqueous phase containing both of the catalyst and DES can be readily recovered by evaporating water and retrieved eight times with negligible loss of catalytic performance.