Synthesis, Structure, and Characterization of Dichloro-(1-Benzyl-4-Acetato-1,4,7-Triazacyclononane)Iron(III)

Autor:	Ferman A. Chavez, Maila E. Finch, Piotr L. Pawlak, Jay M. Anderson, William W. Brennessel, Aramice Y. S. Malkhasian
Rok vydání:	2008
Předmět:	Aqueous solution Chemistry Ligand Inorganic chemistry Medicinal chemistry Chloride law.invention Inorganic Chemistry chemistry.chemical_compound law Oxidation state Octahedral molecular geometry medicine Carboxylate Electron paramagnetic resonance Acetonitrile medicine.drug
Zdroj:	Zeitschrift für anorganische und allgemeine Chemie. 634:1087-1092
ISSN:	1521-3749 0044-2313
DOI:	10.1002/zaac.200800014
Popis:	The synthesis, structure and aqueous solution behavior of [FeL1Cl2] (1, L1 = 1-benzyl-4-acetato-1,4,7-triazacyclononane) is reported. The X-ray structure of 1 reveals iron(III) in distorted octahedral geometry bonded to three amine nitrogen atoms and one carboxylate oxygen atom along with two cis chloride atoms. Electrochemical measurements of 1 in acetonitrile indicate that E1/2 = −200 mV vs Ag/AgCl. The stability of the +3 oxidation state is attributed to the hard Namine and carboxylate ligand donors. In acetonitrile, 1 is mononuclear and has an S = 5/2 spin state. The presence of a μ-oxo bridge upon dissolution of 1 in water is supported by EPR and solution magnetic susceptibility NMR studies. pH-metric titrations and UV-vis studies indicate the presence of a total of four acidic protons. At low pH, L1(OH2)Fe-O-Fe(OH2)L1 is proposed to be stabilized while at high pH, L1(OH)Fe-O-Fe(OH)L1 is suggested to persist.
Databáze:	OpenAIRE
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