Synthesis, Crystal Structure, Thermal Decomposition and Sensitivity Properties of [Zn(AZT)4(H2O)2](PA)2•4H2O and [Zn(AZT)2(H2O)4](HTNR)2•4H2O

Two new coordination compounds [Zn(AZT)(4)(H2O)(2)](PA)(2)center dot 4H(2)O and [Zn(AZT)(2)(H2O)(4)](HTNR)(2)center dot 4H(2)O have been prepared by using AZT (3-azido-1,2,4-triazole) as ligands, PA(-) (picrate) or HTNR- (anion formed by the deprotonation of one of the two hydroxyl-groups of 2,4,6-trinitroresorcinol) as outer anions. The X-ray crystallographic data show that the central zinc(II) ion is coordinated by four N atoms of four AZT molecules and two O atoms of two H2O molecules in [Zn(AZT)(4)(H2O)(2)](PA)(2)center dot 4H(2)O. In [Zn(AZT)(2)(H2O)(4)](HTNR)(2)center dot 4H(2)O, six coordination-atoms come from two N atoms of two AZT molecules and four O atoms of four H2O molecules. The coordination sites of AZT ligands in both compounds are always 4-N atoms of the triazole rings. H2O molecules play vital roles in the formation of hydrogen bonds, which contribute to the construction of the crystal structures of both compounds. The offset face-to-face pi-pi stacking interactions existing in the crystal of [Zn(AZT)(4)(H2O)(2)](PA)(2)center dot 4H(2)O also contribute to the formation and stability of its crystal structure. TG-DTG and DSC analysis results show that the thermal decomposition processes of [Zn(AZT)(2)(H2O)(4)](HTNR)(2)center dot 4H(2)O are milder than those of [Zn(AZT)(4)(H2O)(2)](PA)(2)center dot 4H(2)O due to the more coordination H2O molecules and less AZT ligands in the molecular unit of the former compound. Sensitivity tests reveal that [Zn(AZT)(4)(H2O)(2)](PA)(2)center dot 4H(2)O has sensitive nature towards heat, whereas [Zn(AZT)(2)(H2O)(4)](HTNR)(2)center dot 4H(2)O is insensitive both compounds are insensitive to friction and impact.