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Lanthanoid metal nitrates with hydrogen bonded hexamethylenetetramine

Preparation, characterization and kinetics of thermolysis

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Abstract

Cerium, praseodymium, and neodymium nitrate complexes with hydrogen bonded hexamethylenetetramine (HMTA) of the formula [Ce(NO3)2(H2O)5](HMTA)2(NO3)(H2O)3, [Pr(NO3)2(H2O)6]2[Pr(H2O)9](HMTA)6(NO3)6(H2O)4 and [Nd(NO3)2(H2O)5](HMTA)2(NO3)(H2O)3 have been prepared and characterized by X-ray crystallography. All the complexes belong to monoclinic crystal system. Ce and Nd complexes have P21/n space group, whereas Pr complex has C2/c. Thermal analyses of these complexes were carried out using TG, DSC, which showed their multi-step decomposition. Kinetics of thermolysis has been done by applying model fitting as well as model free isoconversional method. In order to see the response of rapid heating, ignition delay measurements were carried out. The thermal decomposition pathways have also been demonstrated. On the basis of thermal studies the thermal stability of the complexes was found in the order; Pr > Ce > Nd. In order to identify the end products of thermolyses, X-ray diffraction patterns of end product were carried out which showed the formation of corresponding metal oxides.

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Acknowledgements

Thanks are due to Head, Chemistry Department, DDU Gorakhpur University, Gorakhpur for lab facilities. The financial assistance UGC for Emeritus Fellow to Dr. Gurdip Singh and CSIR for SRF to Dinesh Kumar is also acknowledged. Authors are also thankful to Institute Instrumentation Centre, IITR, Roorkee for TG-DSC and Chairman, Department of Materials Engineering, IISc, Bangalore for providing XRD facility.

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Authors and Affiliations

  1. Department of Chemistry, DDU Gorakhpur University, Gorakhpur, 273 009, India

    Dinesh Kumar, I. P. S. Kapoor & Gurdip Singh

  2. Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India

    Udai P. Singh & Nidhi Goel

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  1. Dinesh Kumar
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  2. I. P. S. Kapoor
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  3. Gurdip Singh
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  4. Udai P. Singh
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Correspondence to Gurdip Singh.

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Kumar, D., Kapoor, I.P.S., Singh, G. et al. Lanthanoid metal nitrates with hydrogen bonded hexamethylenetetramine. J Therm Anal Calorim 114, 5–18 (2013). https://doi.org/10.1007/s10973-012-2826-0

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