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Synthesis of Bimetallic Metal–Organic Frameworks: A Strategy to Enhance Water Stability for Flame Retardants
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DOI：10.1021/acs.inorgchem.6c01193.png)
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Abstract
En 中文
Low-characteristic-signal propellants are critical for aviation and missile technology, but existing flame retardants suffer from poor water stability and undesirable combustion interference. A bimetallic MOF strategy is proposed to enhance water stability by immobilizing K+ through coordination interactions, while synergistically integrating flame retardancy with catalytic performance. Two bimetallic MOFs, [Me2NH2][KPb2(TATAB)2]·DMF (MOF 1) and [Me2NH2]2[KNi2(TATAB)2(H2O)6]2·3DMF (MOF 2) (H3TATAB = 4,4,4-(1,3,5-triazine-2,4,6-triyl)tris(azanediyl)tribenzoic acid), were successfully synthesized and structurally characterized by single-crystal X-ray diffraction (SC-XRD). The composition and valence states of the bimetallic MOFs were determined by elemental analysis (EA) and X-ray photoelectron spectroscopy (XPS). Their excellent water stability, thermal stability, and nitrocellulose (NC) compatibility were confirmed by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermal analysis (DTA), and other characterization methods. Through a combustion observation device, the burning characteristics of each formulation were recorded, revealing the flame-retardant and catalytic mechanisms of the MOFs. Compared with KNO3 or K-TATAB controls, the formulation containing MOF 1/2 produced narrower, shorter, and darker flames, with shortened ignition delay and combustion duration. Pb/Ni-TATABs further shortened combustion duration, confirming the catalytic activity of Pb2+/Ni2+. Thus, the distinctive architecture of these bimetallic MOFs offers superior multifunctional additives, integrating water stability, flame retardancy, and catalytic performance.
Keywords:
Bimetals
Metal organic frameworks
Potassium
Redox reactions
Stability
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10.5W
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