A novel two-dimensional layer structure built from a tetracobalt(II)-p- sulfonatothiacalix[4]arene cluster unit

Abstract

The novel coordination polymer [Co4(TCAS)(μ4- SO4)(4,4′-Hbipy)2]n (TCAS = the octaanion of p-sulfonatothiacalix[4]arene) (1) has been synthesized hydrothermally and characterized. X-ray diffraction analyses reveal a two-dimensional (2D) layer structure built from the [Co4(TCAS)(μ4-SO 4)]2-unit. The tetranuclear cobalt(II) clusters bridged by the μ4-SO42- and phenoxy groups of the same TCAS provide a unique trapeziform magnetic mode; magnetic studies in the temperature range 2-300 K show weak antiferromagnetic interactions between the four cobalt(II) centers. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005).