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Preparation and the Standard Enthalpy of Formation of 2-Amino-4,6-dimethoxypyrimidine and the Related Complexes of Copper

W. Qing, Y. Xuwu, G. Shengli, and S. Qizhen

Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry, Northwest University, Xi’an Shaanxi 710069, P. R. China

 

E-mail: weizhang@nwu.edu.cn

Received: 8 March 2002

Abstract: The complexes of hydrous copper chloride and copper nitrate with 2-amino-4,6-dimethoxypyrimidine (AMP) in the mole ratio of 1:2 were prepared through reflux in alcohol. The compositions of the complexes Cu(AMP)2Cl2 and Cu(AMP)2(NO3)2 were determined by chemical and elemental analyses. The bonds between Cu2+ and AMP were investigated by IR, XPS, 1H NMR and the structures of the complexes were presumed. The constant-volume combustion energies of the ligand and the complexes, ΔcE, were determined by a precise rotating bomb calorimeter at 298.15 K. They were (−3340.01 ± 1.54) kJ mol−1, (−5684.22 ± 2.24) kJ mol−1, and (−6526.47 ± 4.59) kJ mol−1. Their standard enthalpies of combustion, ΔcH0m , and standard enthalpies of formation, ΔfH0m , were calculated. They were (−3339.39 ± 1.54) kJ mol−1, (−5678.02 ± 2.24) kJ mol−1, (−6516.55 ± 4.59) kJ mol−1 and (−307.91 ± 1.74) kJ mol−1, (−1670.59 ± 2.73) kJ mol−1, (−933.27 ± 4.85) kJ mol−1.

Full paper in Portable Document Format: 572a97.pdf

 

Chemical Papers 57 (2) 97–101 (2003)

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