A new pentanuclear cyano-bridged complex [{Fe-II (tetraazamacrocycle)}(3){mu-NC-Fe-III(CN)(5)}(2)]: Synthesis, spectroscopic and magnetic characterization

作者：Ishiruji Fabiana H O; Evans David J; Benedito Flavio L; Nunes Fabio S^*

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2008, 70(5): 1029-1033.

DOI：10.1016/j.saa.2007.10.025

• iron-tetmazamacrocycle
• cyano-bridged complex
• Mossbauer
• UV-vis
• SQUID
• molecular modeling

Hexacyanoferrate(III) reacts with [Fe-II(meso)(CH3CN)(2)](ClO4)(2)center dot 2CH(3)CN (meso=5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetra-decane) in acetonitrile/water mixture producing the title complex, where three [Fe(meso)](2+), units are connected by two [Fe(CN)(6)](3-) anions. Molecular modeling (MM+) shows a fairly linear molecule and Mossbauer data are consistent with two terminal pentacoordinated low spin iron(II)-meso units linked to one hexacoordinated low spin iron(II)-meso through two hexacoordinated low spin iron(III) units. Spectroscopic characterization showed a typical mixed-valence charge transfer band and the degree of electron coupling was calculated to be H-AB = 678 cm(-1). Magnetic properties exhibited an anti ferromagnetic exchange interaction between the iron(Ill) ions with a coupling constant J = -44 cm(-1).

• 出版日期2008-10