Citation:
REN Xiao-Lin, SONG Zhen, YANG Bin-Sheng. Spectral Studies on Complex of 2,6-Pyridine Diformylhydrazine 2-Hydroxylnaphthene Carboxylic Hydrazone-Cu(Ⅱ)-CopC[J]. Chinese Journal of Inorganic Chemistry,
;2015, 31(9): 1811-1819.
doi:
10.11862/CJIC.2015.244
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2, 6-Pyridine diformylhydrazine 2-hydroxylnaphthene carboxylic hydrazone (L1) was synthesized by acylation, esterification and aminolysis reaction. The effect of pH value on isomerization of L1 and the binding among L1, Cu(Ⅱ) and copper trafficking protein, apoCopC, were studied by using UV-Vis absorption, fluorescence spectra and fluorescence lifetime measurement. The results show that the binding constant is 3.32×106 mol-1·L for Cu(Ⅱ)-L1, 4.01×105 mol-1·L for L1-apoCopC, separately, in pH value of 7.4, 50 mmol·L-1 Tris-HCl. Meanwhile, the binding constant between Cu(Ⅱ)-L1 and apoCopC is 8.09×105 mol-1·L. The average distance between the bound L1 and Trp83 of apoCopC from fluorescence resonance energy transfer was determined and the binding site of L1 in apoCopC, which locats at N-terminal, was shown by an automated public domain software package ArgusLab 4.0.1. The formation of a ternary complex, L1-Cu(Ⅱ)-CopC, is confirmed by the titration of Cu(Ⅱ) to L1-apoCopC in pH value of 7.4 and 50 mmol·L-1 Tris-HCl.
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