Cover Picture: Synthesis, Characterizations, Magnetism and Thermal Degradation of a 2‐Fold Interpenetrated 3D Cobalt‐Organic Framework (Chin. J. Chem. 3/2014)

Abstract

The cover picture shows a new coordination polymer, [Co2(L)2(4,4′-bipy)]n·3nH2O (1) based on 5-(3-methyl-5-phenyl-4H-1,2,4-triazol-4-yl)isophthalic acid (H2L) and 4,4′-bipyridine (4,4′-bipy), which has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, XRPD, IR, and elemental analysis. The 2D triangle networks were linked by the bridging 4,4′-bipy ligand to give rise to a 2-fold interpenetrated 3D architecture. We can define Co(II) ions as 4-connected nodes and the L2− ligands as 3-connected nodes. Thus, the 3D structure can be described as a 2-fold parallel interpenetrated ins InS 3,4-conn topology. Variable-temperature (2–300 K) magnetic susceptibility measurements indicate that compound 1 exhibits antiferromagnetic interactions between the Co(II) paramagnetic centers. Compound 1 was heated to produce Co3O4. The particle size of the Co3O4 phase is 400–800 nm. More details are discussed in the article by Liu et al. on page 227–232.