Abstract
Self-assembly of Ru2(CO3)43− units and Cu2+ ions in the presence of halogen (Cl− or Br−) has resulted in two novel isomeric layered structural heterometallic carbonates, K2Li[Cu(H2O)2Ru2(CO3)4X2]·5H2O [X = Cl (1), Br (2)]. X-ray structural analysis reveals that complexes 1 and 2 contain a similar square-grid negative layer [Cu(H2O)2Ru2(CO3)4X2]n5n−, in which each Ru2(CO3)4X25− unit is linked by four Jahn–Teller distorted Cu(H2O)22+ ions in a cross mode and vice versa. The adjacent negative layers are connected by K–O, Li–O bonds, and hydrogen bonding, which led to the formation of a supramolecular 3D network structure. The two complexes show ferromagnetic coupling between the Ru2 dimer and the Cu2+ ion. Detailed magnetism measurement demonstrates that complex 1 exhibits soft magnetic ordering below 2.9 K coexistent with domain movement, and complex 2 shows long-range ferromagnetic ordering below 3.8 K.
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