Solvent induced assembly of Co(II) coordination polymers with unprecedented water morphologies

Three new complexes, [Co2(oba)(dbca)(H2O)2]·5(H2O) (1) [Co2(oba)(dbca)(H2O)2]·DMF(H2O) (2) and [Co6(oba)6(pyr)8]·2.5H2O (3) (H2oba = 4,4′-oxydibenzoic acid, H2dbca = diphenic acid, py = pyridine, DMF = N,N-dimethyl formamide) have been synthesized and characterized by infrared spectrum, thermal gravimetric analysis, X-ray powder diffraction and X-ray single crystal diffraction. 3D network of 1 contains interesting water clusters between the layers. Complex 2 displays similar configuration of 1 except that the free DMF molecules occupy the channel which is formed by the host. Complex 3 shows the (2,5)-connection network by using the py as the solvent. The magnetic property of complex 1 is also presented.