Cobalt(Ⅱ) coordination polymers built on isomeric dipyridyl triazole ligands with pyromellitic acid:

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Three new cobalt(Ⅱ) coordination compounds,[Co(3,3’-Hbpt)2(H2pm)(H2O)2]·2H2O(1),[Co(4,4’-Hbpt)(pm)0.5(H2O)]·3H2O (2) and [Co(3,4’-Hbpt)(pm) 0.5 (H2O)3]·2H2O(3)(3,3’-Hbpt=3,5-bis(3-pyridyl)-1H-1,2,4-triazole;4,4’-bpt=3,5-bis(4-pyridyl)1H-1,2,4-triazole,3,4’-Hbpt=3-(3-pyridyl)-5-(4’-pyridyl)-1H-1,2,4-triazole and H4pm=pyromellitic acid) have been synthesized by hydrothermal reactions.Single-crystal X-ray diffraction reveals that compound 1 has a one-dimensional (1D) chain network,2 exhibits a four-connected three-dimensional (3D) structure with 1D open channels encapsulated by water molecules,while 3 displays a regular two-dimensional (2D) architecture connected through 1D metal helical chains.In addition,the efficacy of compounds 1-3 as additives to promote the thermal decomposition of ammonium perchlorate (AP) is explored by differential scanning calorimetry (DSC). [Co (3,3’-Hbpt) 2 (H2pm) (H2O) 2] · 2H2O (1), [Co (4,4’-Hbpt) )] · 3H2O (2) and [Co (3,4’-Hbpt) (pm) 0.5 (H2O) 3] · 2H2O (3’-Hbpt = 1,4-bpt = 3,5-bis (4-pyridyl) 1H-1,2,4-triazole, 3,4’-Hbpt = pyridyl) -5- (4’-pyridyl) -1H-1,2,4-triazole and H4pm = pyromellitic acid have been synthesized by hydrothermal reactions. Single crystal X-ray diffraction reveals that compound 1 has a one- (1D) chain network, 2 exhibits a four-connected three-dimensional (3D) structure with 1D open channels encapsulated by water molecules, while 3 displays a regular two-dimensional the efficacy of compounds 1-3 as additives to promote the thermal decomposition of ammonium perchlorate (AP) is explored by differential scanning calorimetry (DSC).
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