Synthesis Of Conjucted Polymer And Transition Metal Magnetic Complexes And The Research Of Their Functions

In this paper, we synthesized three type polymers and study their chemical and physical properties rescpectively. One section is about one-pot synthesis of a family of well-defined poly(3-hexylthiophene)-b-poly(5,8-di-p-tolylquinoxal-ine-2,3-diyl) rod-rod block copolymers which was a living/controlled chain-growth polymerization using Ni(dppp)Cl2 as a single catalyst. The resulting block copolymer was revealed to self-assemble into various well-defined supramolecular structures depending on the solvents used such as nano-fibril and spherical nanoparticles. Such a block copolymer displayed highly selective visual detection for cobalt. Secondly, two allene derivatives (L-1 and D-1), bearing chiral amide pendants were designed and synthesized. Living polymerizations of L-1 and D-1 with allylnickel complex as a catalyst afforded poly-L-1m and poly-D-lm with controlled molecular weights and narrow molecular weight distributions. These polymers were found to possess a stable helical conformation with a preferred handedness in aprotic solvents on the basis of their circular dichroism (CD) spectra and specific rotation as well as computer simulation. The helical conformation of the polymers was effected by the degree of the polymerization, temperature, solvents polarity and pH. It was confirmed that the copolymerization of L-1 and D-1 obeyed the majority rule. Atomic force microscope (AFM) and scanning electron microscope (SEM) studies revealed poly-L-1100 self-assembled into well-defined helical fibrils with distinct handedness. Thirdly, a hydrogen-bonding linked Co(Ⅱ) 1D supramolecular coordination polymer was obtained and the field-induced slow magnetic relaxation effect is studied.