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Thermal studies on metal complexes of 5-nitroso-pyrimidine derivatives

I. Thermal behaviour of Zn(II) complexes of 6-amino-5-nitrosouracil derivatives

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Abstract

The following Zn(II) complexes of deprotonated 6-amino-5-nitrosouracil (AH), 6-amino-3-methyl-5-nitrosouracil (BH) and 6-amino-1-methyl-5-nitrosouracil (CH) have been prepared and their thermal behaviour studied by TG and DSC techniques: ZnA2(H2O)2, ZnB2 · 4 H2O, ZnC2 · 4 H2O and ZnC2(H2O)2 · H2O. The values of the dehydration enthalpy of the complexes are in the 31.3–76.5 kJ mol−1 H2O range and, except in the first complex, the dehydration processes take place in several steps. The pyrolysis of the complexes finishes between 540 and 725° C ZnO remaining as residue.

Zusammenfassung

Die folgenden Zn(II)-Komplexe von deprotoniertem 6-Amino-5-nitrosouracil (AH), 6-Amino-3-methyl-5-nitrosouracil (BH) und 6-Amino-1-methyl-5-nitrosouracil(CH) wurden dargestellt und hinsichtlich ihres thermischen Verhaltens durch TG und DSC untersucht: ZnA2(H2O)2, ZnB2 · 4 H2O, ZnC2 · 4 H2O und ZnC2(H2O)2. Die Werte der Dehydratisierungs-enthalpien dieser Komplexe liegen im Bereich von 31.3 bis 76.5 kJ per mol H2O. Die Dehydratisieruhg verläuft, außer beim ersten Komplex, in mehreren Stufen. Die Pyrolyse der Komplexe ist bei 540 bis 725° C beendet und ergibt als Rückstand ZnO.

Резюме

Методом ТГ и ДСК изуче но термическое поведение комплексо в депротонированных 6-амино-5-нитрозоурацил а (АН), 6-амино-3-метил-5-нитрозо урацила (5Н) и 6-амино-1-метил-5-нитрозо урацила (СН) с цинком со следующим стехиомет р ческим составом: ZnA2(H2O)2, ZnB2 · 4 Н2О, ZnC2 · 4 H2O и ZпС2(Н2O)2. Значения энтальпии дегидратации компле ксов расположены в об ласти 31,3–76,5 кдж/моль. За исключе нием первого комплек са, процесс дегидрата ции протекает в нескольк о стадий. Пиролиз комплексов заканчив ается в области темпе ратур 540–725 °? с образованием окисла цинка.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, University College, Jaén, Spain

    M. N. Moreno-Carretero, J. M. Salas-Peregrín & A. Mata-Arjona

  2. Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Granada, Spain

    J. M. Salas-Peregrín & A. Mata-Arjona

Authors
  1. M. N. Moreno-Carretero
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  2. J. M. Salas-Peregrín
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  3. A. Mata-Arjona
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Moreno-Carretero, M.N., Salas-Peregrín, J.M. & Mata-Arjona, A. Thermal studies on metal complexes of 5-nitroso-pyrimidine derivatives. Journal of Thermal Analysis 29, 553–559 (1984). https://doi.org/10.1007/BF01913463

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