The critical parameters of pyridine are pressure 6.70 MPa, temperature 620 K and volume 229 cm3·mol−1. 31181-90-5, formula is C6H4BrNO, Name is 5-Bromopicolinaldehyde. In the temperature range 340–426 °C its vapor pressure p can be described with the Antoine equation.. Reference of 31181-90-5.
Pai, Sandesh;Schott, Marco;Niklaus, Lukas;Posset, Uwe;Kurth, Dirk G. research published 《 A study of the effect of pyridine linkers on the viscosity and electrochromic properties of metallo-supramolecular coordination polymers》, the research content is summarized as follows. The authors present the optical, electrochem., and electrochromic properties of Fe(II)-, Co(II)- and Ru(II)-based metallo-supramol. polymers (MEPEs) self-assembled from rigid, π-conjugated bis-terpyridines with different numbers of pyridine linkers. By exciting the metal-to-ligand charge transfer (MLCT) transition, Ru-MEPEs show a weak luminescence in the NIR region (λlum = 765 nm) at room temperature The viscosity of Co-MEPEs in water, ethanol and 75% acetic acid is significantly higher in comparison to the analogous Fe-MEPEs. The SEM cross-section images of the highly transparent dip-coated films show smooth and homogenous surfaces with film thicknesses of <200 nm for Fe-, Co- and Ru-MEPEs. The cyclic voltammograms of the Fe- and Ru-MEPEs show a reversible redox couple corresponding to the Fe(II)/Fe(III) and Ru(II)/Ru(III) states, resp. Co-MEPEs display two metal centered Co(II)/Co(I) and Co(II)/Co(III) reversible redox waves at -1.12 and -0.10 V vs. Fc/Fc+, resp. Fe-MEPE films show a promising high cycle stability over 1000 switching cycles. The coloration efficiencies were also determined for Fe-MEPEs (720 mC cm-2 at 594 nm). The study of the electrochromic properties reveals that the introduction of pyridine linkers enhances the switching stability and reversibility. Co-MEPEs exhibit a broad absorption band covering the visible and NIR region at a neg. potential (-1.4 V vs. Fc/Fc+) due to the metal-to-ligand charge transfer from Co(I) to the acceptor terpyridine ligands.
Reference of 31181-90-5, 5-Bromopyridine-2-carbaldehyde is a useful research compound. Its molecular formula is C6H4BrNO and its molecular weight is 186.01 g/mol. The purity is usually 95%.
5-Bromopyridine-2-carbaldehyde is a water soluble organic molecule that has been shown to inhibit the mitochondrial respiratory chain. It is a structural analog of the natural substrate for mitochondrial cytochrome c oxidase, 5-aminolevulinic acid. This compound has been shown to be selective against cancer cells and has anti-viral properties. The photophysical properties of 5-bromopyridine-2-carbaldehyde have been studied extensively. The fluorescence quantum yield of this molecule in aqueous solution is 0.06%., 31181-90-5.