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A novel phenylacetylene derivative containing urea groups was synthesized and polymerized with a Rh catalyst to give the corresponding polymer, poly(1) with moderate number-average molecular weights. The poly(1) was soluble in toluene, CHCl3, CH2Cl2, THF, DMF, and DMSO, but insoluble in hexane, diethyl ether and MeOH. The specific rotation and circular dichroism(CD) spectroscopic studies revealed that poly(1) took predominantly one-handed helical structures. The presence of intramolecular hydrogen bonding was confirmed by liquid-state IR spectroscopy. The helicity of poly(1) could be tuned by temperature and anion. The helical conformation of the polymer was stable against Br- but susceptible to F-.
A novel phenylacetylene derivative containing urea groups was synthesized and polymerized with a Rh catalyst to give the corresponding polymer, poly (1) with moderate number-average molecular weights. The poly (1) was soluble in toluene, CHCl3, CH2Cl2, THF, DMF The specific rotation and circular dichroism (CD) spectroscopic studies reveals that poly (1) took predominantly one-handed helical structures. The presence of intramolecular hydrogen bonding was confirmed by liquid- state IR spectroscopy. The helicity of poly (1) could be tuned by temperature and anion. The helical conformation of the polymer was stable against Br-but susceptible to F-.