Pb(II)-MOFs assembled with tetrazole-based carboxylic acids as a burn rate modifier

Abstract

Three tetrazole-based carboxylic acids, 3,3-di(1H-tetrazol-5-yl)pentanedioic acid (H₄L¹), 2-(5-pyridin-4-yl-tetrazol-2-yl)propionic anion (HL²), and 5-(2-pyridyl)tetrazole-2-acetic acid (HL³), were selected as ligands to synthesize three new Pb(II)-coordination polymers, [Pb₂(L¹)] · H₂O (1), [Pb(L²)(NO₃⁻)] (2), and [Pb(L³)₂(H₂O)] · H₂O (3). These metal-organic frameworks have been characterized by elemental analysis, FT-IR, and single crystal X-ray diffraction. The results demonstrated that 1 displayed a 3-D network, while 2 and 3 show 2-D framework and 1-D chain, respectively. The differential scanning calorimetry and thermogravimetric analyses gave thermodynamic parameters (ΔH, ΔS, and ΔG). The results showed that 1–3 may be promising high-energy materials.

Keywords:

• Tetrazole-carboxylic acid
• Pb(II)-coordination polymers
• crystal structure
• thermal decomposition
• topology

Disclosure statement

There are no conflicts to declare.