Synthesis of novel pi-conjugated boron polymers containing transition metal in the main chain and their optical properties

Novel pi -conjugated boron polymers containing transition metals in the mai n chain were prepared by hydroboration polymerization between tetrayne mono mer including metal complex and tripylborane. From gel permeation chromatog raphic analysis (THF, PSt standards), the number-average molecular weights of the polymers obtained were found to be 9,000. The polymers were soluble in common organic solvents such as THF chloroform and benzene. The absorpti on peaks due to pi-pi* transition were observed around 390nm in the W-vis s pectra of these polymers. The fluorescence emission spectra exhibited inten se peaks at 490nm (in chloroform, room temperature, excitation wavelength a t 390nm).