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Auxiliary ligand-directed synthesis of 3D energetic coordination polymer from discrete complex: Enhanced energy density, thermal stability and energy performance

Abstract

Since nitrogen-rich coordination polymers were found to be potential energetic materials, numerous energetic coordination polymers (ECPs) have been reported. Among these ECPs, 3D ones exhibit remarkable energy content, high thermal stability and insensitivity. Therefore, the design and synthesis of 3D ECPs is an efficient way to explore novel ECPs of potential use. However, the reaction between energetic ligands and metal ions will not always result in 3D ECPs. The strategy of modulating a non-3D complex into 3D one is unrealized. 3,5-dinitrosalicylic acid (H2DNS) is an organic energetic compound with multi-chelating points. The reaction between H2DNS and Cu(NO3)2•3H2O results in discrete coordination complexes as reported previously. After attempting different experimental parameters we obtained a new discrete complex, Cu(DNS)2∙2[(CH3)2NH2] (1), with moderate energetic performance. To demonstrate the way of tuning energy properties of a complex, a 3D ECP Cu2(DNS)(tetrazole)(H2O) (2) was synthesized through incorporation of 1H-tetrazole into the coordination structure. The crystal structures, sensitivity, thermal analyses, as well as detonation performances of these two complexes were well investigated. The mechanical sensitivity and thermal stability of Cu(DNS)-Cu(tetrazole)2 mixed salts were investigated as well. The results show an overwhelming superiority of the 3D ECP over the discrete coordination complex in terms of density, sensitivity, thermal stability, and energy performances. Cu(DNS)-Cu(tetrazole)2 mixed salts were found inferior in sensitivity and thermal stability to both complexes 1 and 2.

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Publication details

The article was received on 05 Nov 2018, accepted on 29 Nov 2018 and first published on 30 Nov 2018


Article type: Paper
DOI: 10.1039/C8CE01891J
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Auxiliary ligand-directed synthesis of 3D energetic coordination polymer from discrete complex: Enhanced energy density, thermal stability and energy performance

    Z. Guo, Y. Wang, X. Liu, C. Zhang, Y. Zhang and H. Ma, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01891J

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