Product Details of 138219-98-4On March 25, 2003, Peter, Katja; Thelakkat, Mukundan published an article in Macromolecules. The article was ãSynthesis and Characterization of Bifunctional Polymers Carrying Tris(bipyridyl)ruthenium(II) and Triphenylamine Unitsã? The article mentions the following:
The synthesis, characterization, and properties of a highly soluble bifunctional polymer are described in which a tris(bipyridyl)Ru(II) unit acts as dye and triphenylamine units act as charge transport moieties. First a macro-ligand, a bipyridine carrying two poly(4-bromostyrene) chains, was synthesized by atom transfer radical polymerization (ATRP) of 4-bromostyrene in bulk using CuCl/PMDETA as the catalytic system and bis(chloromethyl) bipyridine as the initiator. The target polymer was then obtained via a polymer amination reaction in which the bromophenyl group was converted into a triphenylamine followed by metalation of the bipyridine unit of the macro-ligand with Ru(II) bis(bipyridine). The reaction conditions of ATRP and polymer amination reaction were optimized, and the degree of conversion for both steps was determined by gas chromatog. (GC) anal. of rest monomer content and elemental anal. of unreacted bromine, resp. The control in mol. weight was achieved maintaining a narrow distribution in the desired low mol. weight range of bulk polymerization of 4-bromostyrene. The polymer amination reaction using the Pd(OAc)2 and P(t-Bu)3 system was efficient, and the reaction was complete within 2 h. The metalation reaction could be followed by UV/vis spectroscopy. MALDI-TOF MS of the three polymers was carried out to obtain absolute mol. weights and their distribution. A comparison of these mol. weights gave addnl. information about the degree of polymer amination and metalation reaction. The thermal properties of the different polymers suggest that the thermal stability and the glass transition temperature increases from the starting macro-ligand which carries poly(4-bromostyrene) chains to the intermediate polymer having poly(vinyltriphenylamine) chains and finally to the bifunctional Ru(II) polymer complex. The results came from multiple reactions, including the reaction of 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Product Details of 138219-98-4)
4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals. Product Details of 138219-98-4