Hydrothermal Syntheses,Crystal Structures and Characteristics of Two New Isostructural Ni(Ⅱ) Coordination Polymers

Two new isostructure nickel(Ⅱ) coordination polymers, [Ni_2(5-Me-ip)(1,2-Bie)(H_2O)_2]_n(1) and [Ni2(5-Br-ip)(1,2-Bie)(H_2O)_2]n(2)(5-Me-H2 ip = 5-methylisophthalic acid, 5-Br-H2 ip = 5-mromoisophthalic acid, 1,2-Bie = 1,2-bis(imidazole)ethane), have been synthesized and structurally characterized by single-crystal X-ray diffraction. The result shows that complexes 1 and 2 crystallize in orthorhombic system, space group Pna21 with a = 16.3602(13), b = 10.1465(8), c = 21.8803(17) ?, V = 3632.1(5) ?3, Z = 4, D3 c = 1.525 g/cm, F(000) = 1728, R = 0.0292 and wR = 0.0668 for 6646 observed reflections(I 2σ(I)) for complex 1 and a = 16.409(3), b = 10.1625(17), c = 21.918(4) ?, V = 3654.9(11) ?3, Z = 4, Dc = 1.752 g/cm~3, F(000) = 1936, R = 0.0309 and wR = 0.0600 for 6809 observed reflections(I 2σ(I)) for complex 2. They both feature zigzag 2D layer structures, which are further staked along the a-axis through π···π and hydrogen interactions to form 3D supramolecular structures.