Kinetics and mechanism of thermal decomposition of copper hypophosphite
TL;DR: In this article, an elaborate investigation of the thermal decomposition reaction for crystalline copper hypophosphite by kinetic, radiospectroscopic and optical methods was carried out and it was found possible to suggest the mechanisms by which the decomposition kinetics are regulated.
About: This article is published in Thermochimica Acta.The article was published on 1981-02-02. It has received 9 citations till now. The article focuses on the topics: Hypophosphite & Thermal decomposition.
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TL;DR: In this article, a manganese hypophosphite monohydrate (α-Mn(H2PO2)2·H2O) was synthesized and characterized by differential thermal analysis-thermogravimetry, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR).
50 citations
TL;DR: In this article, the authors systematically consider the factors responsible for localization and autolocalization of thermal decomposition processes of solids and show the specificity and complexity of nucleation and nuclei growth in topochemical processes.
29 citations
TL;DR: The synthesis reported here produces large amounts of CuH particles in aqueous media, with very little impurities, and the fact that these can then be converted to a stable electrically conductive film can open up new applications for CuH such as for printing electricallyonductive films or manufacturing surface coatings.
Abstract: The most common synthesis methods for copper hydride (CuH) employ hard ligands that lead to the formation of considerable amounts of metallic Cu as side-product. Here we explore a synthesis method for CuH(s) through the reaction of CuCO3·Cu(OH)2(s) with hypophosphorous acid (H3PO2) in solution, via the formation of the intermediate Cu(H2PO2)2(aq) complex. The reaction products were characterized with XRD, FTIR and SEM at different reaction times, and the kinetics of the transformation of Cu(H2PO2)2(aq) to CuH(s) were followed with NMR and are discussed. We show that our synthesis method provides a simple way for obtaining large amounts of CuH(s) even when the synthesis is performed in air. Compared to the classic Wurtz method, where CuSO4 is used as an initial source of Cu2+, our synthesis produces CuH particles with less metallic Cu side-product. We attribute this to the fact that our reaction medium is free from the hard SO42− ligand that can disproportionate Cu(I). We discuss a mechanism for the reaction based on the known reactivity of the reagents and intermediates involved. We explored the possibility of using CuH(s) for making electrically conductive films. Tests that employed water-dispersed CuH particles show that this compound can be reduced with H3PO2 leading to electrically conductive thin films of Cu. These films were made on regular office paper and were found to be Ohmic conductors even after several weeks of exposure to ambient conditions. The fact that the synthesis reported here produces large amounts of CuH particles in aqueous media, with very little impurities, and the fact that these can then be converted to a stable electrically conductive film can open up new applications for CuH such as for printing electrically conductive films or manufacturing surface coatings.
11 citations
TL;DR: In this paper, the site symmetry, coordination geometry and structural changes in rare-earth complexes of high and low symmetry are compared with X-ray data, and the use of electronic absorption spectra to explore the coordination geometry of a complexed rare earth ion is considered.
6 citations
TL;DR: The diffusion coefficient of ammonium perchlorate and copper hypophosphite at 20°C was found to be 10−10 cm2/sec and 10−9 cm 2/sec, respectively as mentioned in this paper.
6 citations