Syntheses and Crystal Structures of Two New Complexes Based on R-isophthalate (R = –CH3 or –OCH3) and bis(imidazole) Co-ligand

Abstract

Two new complexes, [Co(CH3-ip)(biim-5)]n (1) and [Co(CH3O-ip)(biim-5)]n (2) (CH3-H2ip = 5-methylisophthalate, CH3O-H2ip = 5-methoxyisophthalate, biim-5 = 1,5-bis(imidazole)pentane), have been synthesized via hydrothermal reactions and characterized by elemental analysis and single-crystal X-ray analysis. Complex 1 belongs to the monoclinic system, P2(1)/c space group, a = 9.464(2) Å, b = 14.567(4) Å, c = 15.206(4) Å, β = 102.369(2)°, F (000) = 916, R1 = 0.0701, wR2 = 0.1831; complex 2 belongs to the monoclinic system, P2(1)/c space group, a = 9.5922(17) Å, b = 15.231(3) Å, c = 16.3797(19) Å, β = 122.638(7)°, F (000) = 948, R1 = 0.0466, wR2 = 0.1188. In the two complexes, CH3-ip and CH3O-ip both adopt bis-monodentate bridging modes to link neighboring Co(II) ions to form 1D chains, which are further across-linked by biim-5 ligands to generate 2D (4,4) rectangular grid layers. These identical 2D single nets are interlocked with each other and form an interesting threefold parallel interpenetrated architecture.