TY - JOUR
T1 - A screened hybrid density functional study on energetic complexes
T2 - Cobalt, nickel and copper carbohydrazide perchlorates
AU - Huang, Huisheng
AU - Zhang, Tonglai
AU - Zhang, Jianguo
AU - Wang, Liqiong
PY - 2010/7
Y1 - 2010/7
N2 - The molecular geometry, electronic structure, infrared spectra and thermochemical properties of cobalt and nickel tris(carbohydrazide) perchlorates (CoCP and NiCP) as well as copper bis(carbohydrazide) perchlorate (CuCP) were investigated using the Heyd-Scuseria-Ernzerhof (HSE) screened hybrid density functional. The results show that both perchlorate ions coordinate with the copper atom, and the interactions between copper and perchlorate are ionic, whereas all the metal-carbohydrazide interactions are covalent. Due to the delocalization from the σN-H bond orbital to the n*M antibond orbital, the amino stretching vibrations of these complexes show considerable red-shift compared with those of free carbohydrazide ligand. The calculated heats of reaction and formation indicate that the formations of these complexes are exothermic, and the order of their thermal stability is NiCP>CoCP>CuCP. These agree well with the experimental results. Finally, we find that there is a relationship between the energy gap and impact sensitivity.
AB - The molecular geometry, electronic structure, infrared spectra and thermochemical properties of cobalt and nickel tris(carbohydrazide) perchlorates (CoCP and NiCP) as well as copper bis(carbohydrazide) perchlorate (CuCP) were investigated using the Heyd-Scuseria-Ernzerhof (HSE) screened hybrid density functional. The results show that both perchlorate ions coordinate with the copper atom, and the interactions between copper and perchlorate are ionic, whereas all the metal-carbohydrazide interactions are covalent. Due to the delocalization from the σN-H bond orbital to the n*M antibond orbital, the amino stretching vibrations of these complexes show considerable red-shift compared with those of free carbohydrazide ligand. The calculated heats of reaction and formation indicate that the formations of these complexes are exothermic, and the order of their thermal stability is NiCP>CoCP>CuCP. These agree well with the experimental results. Finally, we find that there is a relationship between the energy gap and impact sensitivity.
KW - Density functional theory
KW - Electronic structure
KW - Heats of formation
KW - Impact sensitivity
KW - Primary explosives
UR - http://www.scopus.com/inward/record.url?scp=77952889344&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2010.02.036
DO - 10.1016/j.jhazmat.2010.02.036
M3 - Article
C2 - 20363561
AN - SCOPUS:77952889344
SN - 0304-3894
VL - 179
SP - 21
EP - 27
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -