Synthesis, characterization of imidazole‐based copper complex mixtures and study of their thermal behaviour

Abstract

Herein, the synthesis, characterization and thermal behaviour of imidazole-based two copper-phosphate mixtures, A = Cu 2 (PO 4 )(OH)ÁCu(HPO 4 )(H 2 O)Á(C 3 H 4 N 2 ) 2 . 3.25 H 2 O and B = Cu 3 (PO 4 ) 2 H 2 OÁ(C 3 H 4 N 2 ) 3 (H 2 O)Á0.1(C 3 H 4 N 2 ).3.25 H 2 O are reported. The characterization was done by adopting various electro-analyticaltechniques such as elemental analysis, X-ray Powder Diffraction (XRD), Thermogravimetric Analysis (TGA) and Derivative Thermogravimetry (DTG), Fourier Transform Infrared (FT-IR) Spectrometry, Absorption Spectrophotometry and Ultraviolet-Visible and near Infrared (UV-Vis-NIR). Differential Scanning Calorimetry performed with the heating rate 10 K/min from 297.96 to 770.46 K in normal atmosphere for both mixtures. DSC data indicated that both mixtures A and B are exhibiting exothermic property by their net specific heat capacities (C p ) −11.11 and −2.83 J/g K, respectively. Therefore, these complex mixtures can be utilized as heat dissipation materials. Both mixtures A and B undergo phase change in terms of hydrated phase to dehydrated phase up to 356 and 392 K, respectively. The specific heat capacity of Mixture A during hydration, C p = 2.54 J/g K, is higher than the tin, lead, stainless steel, glass and aluminium at their respective melting points. This mixture is also found better than the commercial product based on lithium ion battery in terms of specific heat capacity. From UV-Vis-NIR analysis, it is found that the mixtures A and B are showing semiconducting behaviour with band gaps 1.66 and 1.68 eV, respectively. The average crystallite sizes of these nano-complex mixtures are 35.29 and 30.94 nm and these were calculated using the Debye-Scherrer equation and Williamson-Hall method.

Heat repellent behavior of cobalt‐based imidazole containing phosphate and meta‐phosphate complex mixtures

“…Though thermal heat exchange took place more than the mixture viz. 6 but the values did not match up to our expectation. After careful analysis of TG-DTA data, it was found that the coordinated hydrated molecules have not participated in hydrated to dehydrated-phase change conversion in the experimental temperature range.…”

“…The current study of these coordination compounds was taken up with the following presumptions. Interpretation of the experimental data for composition calculations revealed that a coordination complex is formed with hydrated molecules inside the coordination sphere, which led us to anticipate a phase change from hydrated form to dehydrated form with a maximum thermal heat exchange compared to our previous study 6 due to the presence of more hydrated molecules. Though thermal heat exchange took place more than the mixture viz.…”

“…The negative specific heat capacity at low temperature in the case of complex mixture C can be explained using Equation (6).…”

“…[3][4][5] Many phosphate-based inorganic metal compounds have been synthesized by researchers and utilized in diversified fields, ranging from energy storage to catalysis. [6][7][8][9] In recent times, the usage of heat repellent material 10 is as significant as heat storage materials. Swain and Brahma 11 have studied nickel mixtures for possible use as heat repellant material.…”

Investigation on the Thermo-Oxidative Degradation of Polyethylene, Poly(vinyl chloride), and Polystyrene Using NiPIm1.5 and NiPIm2 Nanocomposites

“…All analyses such as IR, DSC, TG-DTA, ICP-OES, FESEM, and XRD were carried out to characterize the above composites by adopting the same procedure as reported in our previous work . The functional groups were identified from the FT-IR study using a Thermo Nicolet Nexus 670 setup between 400 and 4000 cm –1 .…”