Untitled

Synthesis, spectroscopic and X-ray characterization of a copper(II) complex with the Schiff base derived from pyridoxal and aminoguanidine: NMR spectral studies of the ligand

“…Participation of the azomethine nitrogen in coordination with Cu(II) is confirmed by the shift of the m(N-N) [16] to higher wavenumber (10 cm À1 ) and m(C@N) to lower wavenumber (42 cm À1 ) in the spectrum of the complex as compared to those of the ligand [17]. Also, the m(C@N) frequency of the guanido group [18] in PL-AG AE HCl AE H 2 O is shifted to lower frequency region in the complex, confirming the coordination of the guanido group.…”

Precise Regulation of Combustion Characteristics of High-Energy Composite Propellants by Incorporation of CL-20 Crystals Intercalated with Energetic Burn Rate Modifiers

“…However, as the pressures increase from 10 to 15 MPa, despite the burn rates of CP-A and CP-B still being lower than that displayed by reference propellant at pressures of 10, 12, and 15 MPa, they are found to rapidly increase, implying that the capacity of TAGP-Ms to inhibit the burn rates of composite propellants appears to be weakened with the pressure. It was reported that the tertiary-amine structure would decrease the burn rate of nitramine compounds, however, this type of structure possessed by the TAGP molecule herein would not be stable at high temperatures, and it can be transformed to some radicals resulting in the stabilization effect on the burn rate of nitramine by the tertiary-amine structure to be greatly diminished. Therefore, the calculated burn rate pressure exponents for CP-A and CP-B ( n = 0.38–0.39) at pressures ranging from 5 to 15 MPa appear to be slightly high but still lower than that of reference propellant ( n = 0.42) by ∼10%, which suggests that TGAP-Ba and TAGP-K can serve to be the promising candidates as burn rate modifiers in tuning the combustion behaviors of CL-20-containing composite propellants at lower pressures.…”

First-principles calculation of electronic, vibrational, and thermodynamic properties of triaminoguanidinium nitrate

“…As shown in Table 1, this paper calculates the bond length of C-N. We can see that the bond length of C-N is between the length of the C-N single bond and the C-N double bond. This means that C-N is a partial double bond [5,20,21]. There are two types of hydrogen bonds in the TAGN unit cell.…”

“…With its own superior properties, it is widely used in gas generating agents, propellants, and explosive additives [1][2]. At the same time, TAGN has good thermal stability and can be stored for a long time without deterioration [3][4][5]. Therefore, the synthesis of TAGN has always been the focus of research.…”