13119-82-9Relevant academic research and scientific papers
Amino substituted 4-pyridylbutadienes: Synthesis and fluorescence investigations
Agnihotri, Harsha,Mahalingavelar, Paramasivam,Mande, Hemant,Ghalsasi, Prasanna,Kanvah, Sriram
, p. 341 - 348 (2015)
Synthesis and spectroscopic investigations of a series of donor-π-acceptor systems containing pyridine as the electron withdrawing group and an amino derivative (dimethylamino, diphenylamino, carbazole and julolidine) as electron donating group, separated by a π-spacer are described. The effect of varying donors on absorption and emission properties was studied in different solvents. All the molecules investigated exhibit pronounced positive polarity dependent solvatochromic shifts of up to ～141 nm. Strong fluorescence quantum yields are also observed for dienes containing carbazole and diphenylamine donors. This behavior suggests the presence of highly polar emitting states as a result of π -π?intramolecular charge-transfer (ICT). The observations were corroborated by a linear relation of the fluorescence maximum (νmax) versus the solvent polarity function (Δf) from the Lippert-Mataga correlation. The emission lifetime shows a decay profile consistent with the formation of one species (1 and 3) and two species (2 and 4) in the excited state.
Catalytic Deoxygenative Coupling of Aromatic Esters with Organophosphorus Compounds
Kurosawa, Miki B.,Isshiki, Ryota,Muto, Kei,Yamaguchi, Junichiro
supporting information, p. 7386 - 7392 (2020/04/30)
We have developed a deoxygenative coupling of aromatic esters with diarylphosphine oxides/dialkyl phosphonates under palladium catalysis. In this reaction, aromatic esters can work as novel benzylation reagents to give the corresponding benzylic phosphorus compounds. The key of this reaction is the use of phenyl esters, an electron-rich diphosphine as a ligand, and sodium formate as a hydrogen source. Arylcarboxylic acids were also applicable in this reaction using (Boc)2O as an additive. Palladium/dcype worked to activate the acyl C-O bond of the ester and to support the reduction with sodium formate.
Caroviologens. Synthesis and optical properties of Α,Ο-bis-pyridine and Α-Ο-bis-pyridinium polyenes
Blanchard-Desce, M.,Arrhenius, T.S.,Lehn, J.M.
, p. 266 - 272 (2007/10/02)
Molecular wires that allow electron flow to take place between different components are fundamental elements in the design of molecular devices.One possible approach to such species involves molecules based on an extended conjugated chain that bears termi
PHOSPHORYLMETHYLPYRIDINES AND THEIR n-OXIDES: SYNTHESIS AND EQUILIBRIUM CH-ACIDITY
Bodrin, G. V.,Matveeva, A. G.,Terekhova, M. I.,Matrosov, E. I.,Petrov, E. S.,et al.
, p. 810 - 818 (2007/10/02)
Certain phosphorylmethylpyridines and their N-oxides were synthesized, which are of interest as extractants and complex-forming agents.Their equilibrium CH-acidity with reference to 9-phenylfluorene (k+ counterion) was studied by the indicator method in dimethyl sulfoxide.The acidifying action of a series of pyridine groupings was characterized by means of ?C- values.
