Antiferromagnetic Coupling in a New Mn(III) Schiff Base Complex with Open-Cubane Core: Structure, Spectroscopic and Luminescence Properties

Abstract

A new open-cubane Mn-III, [{(H2O)(MnL)-L-III}{(MnL)-L-III}](2)center dot 2(CH3OH).2(CH3CH2OH)center dot 2Cl, 1 where H (2) L=[N-(2-hydroxyethyl)-3-methoxysalicylaldimine] has been synthesized and characterized by element analysis, FT-IR, solid UV-Vis spectroscopy and single crystal X-ray diffraction. The crystal structure determination shows an open-cubane tetranuclear complex. The Mn1 (Mn1(i)) ions is hexacoordinate by NO5 donor sets while the Mn2 (Mn2(i)) is pentacoordinate by NO4 donor sets. The solid state photoluminescence properties of complex 1 and its ligand H (2) L have been investigated under UV light at 349 nm in the visible region. H (2) L exhibits blue emission while complex 1 shows orange-red emission at room temperature. Variable-temperature magnetic susceptibility measurements on the complex 1 in the range 2-300 K indicate an antiferromagnetic interaction.