synthesis, characterization, and crystal structure of a new coordination polymer, {[ba2(hpydc)2(pydc)(h20)31.h20.(112p3110}n

the reaction of barium chloride with 2, 6-pyridinedicarboxylic acid in water led to the formation of a novelpolymeric complex formulated as {[ba2(hpydc)2(pydc)(h20)3].h20.(h2pydc)}.(i). the crystal structure of (i)was characterized by single crystal x-ray diffraction method. the complex was crystallized in the monoclinicsystem with space group p2/c, with four molecule in unit-cell, e.g z=4. the unit-cell parameters were a=15.320(3) a, b= 6.902(1) a, c= 19.930(4) a; 0 = 97.39 (3). the unit-cell of this novel self assembled pyridinecontaining ligand system was constructed from eight and ten coordinate barium ions. noteworthy, compound (i)consisted of three different kinds of neutral h2pyd and anionic hpydc- , pydc2- forms of 2,6-pyridinedicarboxylic acid ligands