ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis, characterization and reaction kinetics of an energetic copper (II) complex based on 3,5 dinitrobenzoic acid and 2, 2' bipyridine

Priyanka Singla, Arjun Singh, Subash Chandra Sahoo, Pramod Kumar Soni, and Prateek Kishore

Terminal Ballistics Research Laboratory, Explosive Group, Chandigarh, India

E-mail: arjunsngh@yahoo.com

Received: 21 March 2021  Accepted: 27 November 2021

Abstract:

An energetic Copper (II) complex based on 3,5 dinitrobenzoic acid (DNBA) was synthesized from copper nitrate, DNBA and 2,2' bipyridine and characterized by elemental analysis, FTIR, UV–Vis and single crystal X-ray diffraction techniques. The XRD results confirmed that the complex consists of one dimensional linear chains in which three ligands coordinated with copper metal via nitrogen and oxygen atoms of bipyridine and two DNBA molecules, respectively. The decomposition, kinetics and reaction mechanism for the decomposition reaction were studied by using thermogravimetry and differential scanning calorimetry analyses. The results indicate that the copper (II) complex possesses high thermal stability, above 230 °C. The values of the activation energy were found to be 182.2 kJ/mol from Flynn–Wall–Ozawa (FWO) and 183.1 kJ/mol from Kissinger-Akahira-Sunose (KAS) method, respectively. The pre-exponential factors of the copper (II) complex for different ranges of conversions were determined by using the compensation effect. The reaction model for decomposition reactions is probably best described by Avrami-Erofeev (A₂) model. Furthermore, computation of the thermodynamic parameters for formation of activated complex were carried out using DSC data. The results of sensitivity tests show that the copper (II) complex is insensitive in nature towards impact and friction forces.

Keywords: Copper complex; Chemical structure; Thermal decomposition kinetic; Reaction model; Sensitivity

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-02000-3

Chemical Papers 76 (4) 2153–2165 (2022)