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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 2
BKCSDE 26(2)
February 20, 2005 

Crystal Packing of Two Different Tetranuclear Iron(III) Clusters, [(tacn)4Fe4O2(OH)4]2·8Br·9H2O (tacn = 1,4,7-triazacyclononane)
Mi Kyung Jin, YooJin Kim, Duk-Young Jung*, Min Heu, Seokwon Yoon, Byoung Jin Suh
Iron(III), Tetranuclear complex, Tacn, Magnetic properties
[(tacn)4Fe4O2(OH)4]2·8Br·9H2O (tacn = 1,4,7-triazacyclononane), a tetranuclear iron(III) complex was synthesized by the hydrolysis of (tacn)FeCl3 and crystallizes in the orthorhombic space group, Pca2(1), with cell parameters, a = 37.574(3) A, b = 16.9245(12) A, c = 14.2830(11) A, V = 9082.9(12) A3. [(tacn)4Fe4O2(OH)4]4+ cations approach S4 point symmetry containing an adamantane skeleton. Four Fe(III) atoms have distorted octahedral environments with two hydroxo and an oxo bridges. Two [(tacn)4Fe4O2(OH)4]4+ clusters having different Fe…Fe distances are connected to each other by the networked hydrogen bonds. The electrochemical behavior reveals irreversible three cathodic and two anodic peaks. Magnetic properties are characterized by antiferromagnetic (AF) interactions between Fe(III) ion spins. However, the low-lying states are still magnetic and exhibit a blocking behavior and a magnetic hysteresis at low temperatures.
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