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Synthesis, spectral and thermal properties of some transition metal(II) complexes with a novel ligand derived from thiobarbituric acid

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Abstract

Four novel metal(II) complexes, Ni(L)2, Co(L)2, Cu(L)2, and Zn(L)2 (L = 5-(2-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)hydrazono)-1,3-diethyl-2-thioxo-dihydropyrimidine-4,6(1H,5H)-dione), were synthesized using the procedure of diazotization, coupling and metallization. Their structures were identified by elemental analyses, 1H NMR, ESI-MS and FT-IR spectra. The effect of different central metal(II) ions on absorption bands of the metal(II) complexes was researched. The thermal properties of the metal(II) complexes were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC). Furthermore, the thermodynamic parameters, such as activation energy (E*), enthalpy (∆H*), entropy (∆S*) and free energy of the decomposition (∆G*) are calculated from the TG curves applying Coats–Redfern method. The results show that the metal(II) complexes have suitable electronic absorption spectra with blue-violet light absorption at about 350–450 nm, high thermal stability with sharp thermal decomposition thresholds.

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Acknowledgements

Financial support from the National Natural Science Foundation of China (No. 60490290), Chinese Academy of Sciences (KJCX2.YW.M06) and the National Science and Technology Program of China (No. 2007AA03Z412) is gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory of High Power Laser Materials, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, No. 390, Qinghe Road, Jiading District, Shanghai, 201800, People’s Republic of China

    Xiaoyi Li, Yiqun Wu, Donghong Gu & Fuxi Gan

  2. Key Lab of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, Haerbin, 150080, People’s Republic of China

    Yiqun Wu

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  1. Xiaoyi Li
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  2. Yiqun Wu
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  3. Donghong Gu
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Correspondence to Yiqun Wu.

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Li, X., Wu, Y., Gu, D. et al. Synthesis, spectral and thermal properties of some transition metal(II) complexes with a novel ligand derived from thiobarbituric acid. J Therm Anal Calorim 98, 387–394 (2009). https://doi.org/10.1007/s10973-009-0290-2

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  • DOI: https://doi.org/10.1007/s10973-009-0290-2

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