In this work, we report a tetranuclear Co-4 cluster, namely [Co-4(L)(2)(mu(2)-OCH3)(2)(mu(3)-OCH3)(2)(CH3OH)(2)]center dot 2CH(3)OH (1, H2L = 2-{[(2-hydroxy-3-methoxyphenyl)methylidene]amino}benzoic acid). The complex was synthesized and characterized by IR, elemental analysis, thermogravimetric analysis and single crystal X-ray diffraction. X-ray crystallography reveals that complex belongs to the monoclinic crystal system, space group P2(1)/n. Further, their fluorescence and magnetic properties are also discussed. The variable temperature magnetic susceptibilities for complex indicate the ex...