4.7 Article

A new μ-oxo di-iron complex with suitable features to mimic metallohydrolase activity:: X-ray molecular structure, aqua solution behavior and nuclease activity of the complex [Fe(HPClNOL)(SO4)]2-μ-oxo

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INORGANIC CHEMISTRY COMMUNICATIONS
卷 11, 期 6, 页码 643-647

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ELSEVIER SCIENCE BV
DOI: 10.1016/j.inoche.2008.02.019

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DNA cleavage; hydrolysis; potentiometric titration; di-iron complex; nuclease activity

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The reaction of FeSO(4)center dot 7H(2)O with the ligand HPClOL (1-(bis-pyridin-2-ylmethyl-amino)-3-chloropropan-2-ol results in the complex [Fe(HPClNOL)(SO(4))](2)-mu-oxo center dot 6H(2)O 1, in which the iron ions are coordinated by two pyridines, one amine and one alcohol group from the ligand HPClNOL, an oxo bridge and monodentate sulfate ion. The complex is highly soluble in water and potentiometric titration experiments reveal four protonation/deprotonation equilibria, with pK(a) values of 2.77(3), 4.34(6), 8.07(4) and 8.58(8). The nuclease activity of complex 1 was evaluated at pH 7.0, 8.0 and 9.0. Complex 1 was able to promote single and double strand DNA cleavage in both aerobic and anaerobic condition, indicating that the cleavage process should follow a hydrolytic mechanism. (C) 2008 Elsevier B.V. All rights reserved.

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