Two supramolecular polymers have been constructed from 2,3,5,6-tetrabromoterephthalic acid (H2TBTA) and 1,3-bis(4-pyridyl)propane (BPP) ligands in water-methanol dissolvant. Single-crystal X-ray and powder diffraction, IR spectroscopy, thermogravimetric analysis, and elemental analysis were employed to characterize all samples. Both of the complex compounds 1 and 2 belong to triclinic crystal system with P-1 space group. The crystal structures analysis indicates that the metal atom coordinated by two carboxylate groups from different TBTA ligands, two BPP, molecules and two H2O molecules formed a slightly distorted octahedral configuration. The compounds of 1 and 2 are 1D chains made with TBTA spacers, BPP molecules, and H2O molecules. 1. Introduction Rational design and preparation of supramolecular polymers have attracted considerable attention owing to their potential applications in optics, magnetism, adsorption, ion exchange, catalysis, and so forth [1–7]. In principle, the most effective approach for producing such metal-organic supramolecular polymers is primarily dependent on the rational choice of the organic-bridging ligands as well as the metal ions [8–13]. To date, polycarboxylate ligands, especially the rigid dicarboxylate ligands, have been commonly used in preparing the novel metal-organic frameworks [14–17]. Comparison to terephthalic acid, the ortho substituents on the related ligands can significantly affect the relative orientation of the carboxylate groups. Some scholars regard the effect of high steric hindrance groups as the special “knockon effect” of H2TBTA [18–21]. Besides, some complexes of carboxylate acid with secondary organic ligands (such as 2,2′-bipyridine, 4,4′-bipyridine, and 1,3-bis(4-pyridyl)propane) have been widely investigated. Different from 4,4′-bipyridine and its derivatives, 1,3-bis(4-pyridyl)propane is flexible and can adopt different conformations characterized due to the aliphatic chain between the two pyridine rings. In view of the bridging and blocking function of the 2,3,5,6-tetrabromoterephthalic acid (H2TBTA) and 1,3-bis(4-pyridyl)propane (BPP) ligands, therefore, in this paper, we have been assembled two supramolecular polymers conformed Mn and Co metal ions with H2TBTA and BPP under the same conditions, and the phase purity of the crystalline products was confirmed by powder X-ray diffraction (PXRD, see Figures and ). (See Supplementary Material available online at doi: 10.1155/2012/274508). 2. Experimental 2.1. Synthesis of Complexes 1 and 2 2.1.1. (1) A mixture of H2TBTA (10？mg, 0.02？mmol), BPP
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