文摘
Isomer is sometimes fundamental to the formation of the resulting compounds. The design and preparation of coordination compounds based on isomers is of tremendous paramount since they have a lot in common but simultaneously some difference, which can lead to variation of both the topologies and properties. Solvothermal reactions of Hn-pytza (n = 3, 4) with Co(ClO4)2·6H2O, afforded two interesting coordination polymers, one dimensional [Co(3-pytza)2(H2O)2]n·2nH2O (1) and three dimensional [Co(4-pytza)2]n (2), where Hn-pytza = 5-(n-pyridyl)tetrazole-2-acetic acid (n = 3, 4). The thermal decomposition behavior of the two compounds were characterized by the differential scanning calorimetry (DSC) and thermogravimetric-differential thermogravimetric (TG-DTG), showing [Co(4-pytza)2]n is superior to [Co(3-pytza)2(H2O)2]n·2nH2O in terms of energetic performance. Furthermore, the entropy of activation (∆S), enthalpy of activation (∆H), and free energy of activation (∆G) were calculated, as well.