Utilizing 2,2′-bipyridine-3,3′-dicarboxylic acid 1,1′-dioxide (H2BDCD) and CuCl2·2H2O (or Ba(NO3)2·6H2O) under hydrothermal conditions produces two novel coordination polymers {[Cu(BDCD)]·EtOH}n, 1 and [Ba(BDCD)·2H2O]n, 2. X-ray structure determination reveals that compound 1 shows a two-dimensional structure which is constructed by a well known (4,8) three-connected bimodal net, compound 2 exhibits a novel three-dimensional structure with interesting barium pillars as building blocks.
