Two　new　Co(II)　coordination　polymer,　namely　[Co2(L)　2(H2O)]n　(1)　and　[Co(L)(phen)(H　2O)]n·xH2O　(2)　(H2L　=　5-(benzyloxy)isophthalic　acid,　phen　=　1,10-phenanthroline)　have　been　hydrothermally　synthesized　and　characterized　by　elemental　analysis,　powder　X-ray　diffraction,　thermal　analysis　and　single　crystal　X-ray　analysis.　The　molecular　structure　of　1　contains　two　Co(II)　ions,　two　L2-　ligands　and　one　coordinated　water　molecule,　which　further　extends　into　a　complicated　3D　framework　with　the　tails　of　L2-　ligands　filling　in　the　hexagonal　channels,　and　the　molecular　structure　of　2　contains　one　Co(II)　ions,　one　L2-　ligands,　one　phen　ligands,　one　coordinated　water　molecule　and　half　of　the　water　molecule　of　crystallization,　which　further　extends　into　a　1D　chain　structure.　In　addition,　photocatalytic　investigation　on　compounds　1　and　2　reveals　that　they　are　active　catalyst　for　degradation　of　methyl　blue.©　2013　Elsevier　B.V.　All　rights　reserved.