Phase stability and magnetic properties of a new cobalt(II) coordination polymer based on 2-carboxyethylphosphonate and 1,10′-phenanthroline

Co2(HO3PCH2CH2COO)2(C12H8N2)2 has been synthesized from [Co2(HO3PCH2CH2COO)2(C12H8N2)2(μ-OH2)](H2O) by thermal treatment (350 °C) under inert atmosphere (N2). The transformation between the initial compound to a red-pink crystalline solid is mediated by an intermediate blue amorphous material. Co2(HO3PCH2CH2COO)2(C12H8N2)2 is stable in air until 440 °C, showing some trends of being magnetically ordered below 2 K.We thank financial support from Spanish Ministerio de Ciencia e Innovación (MAT2010-15094, MAT2008-06542-C04, MAT2006-01997, Factoría de Cristalización – Consolider Ingenio 2010) and FEDER.Peer Reviewe