A new Ni(II) coordination polymer constructed by 1,10-phenanthroline derivative 2-(2-chloro-6-fluorophenyl)-1 H-imidazo[4,5- f][1, 10]phenanthroline (L) and inorganic sulfate anion, namely, [Ni(L)(SO)(HO)] ( 1), has been successfully synthesized under hydrothermal condition. In compound 1, each sulfate functions in bidentate bridging coordination mode and links two Ni(II) atoms to generate a one-dimensional chain structure. The adjacent chains are joined together by aromatic π- π interactions between L ligands to yield a two-dimensional supramolecular layer. The O-H···O and N-H···O hydrogen bonding interactions between sulfate oxygen atoms, coordination water molecules and nitrogen atoms of L ligands further stabilize the two-dimensional supramolecular architecture of 1. Moreover, the magnetic property of 1 was investigated. In addition, natural bond orbital analysis was performed by the B3LYP/LANL2DZ method in Gaussian 09 Program. The calculation results show the obvious covalent interaction between the coordinated atoms and Ni(II) ion. [ABSTRACT FROM AUTHOR]