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

Two new isostructure nickel（Ⅱ） coordination polymers, [Ni;（5-Me-ip）(1,2-Bie)（H;O）;];（1） and [Ni2（5-Br-ip）(1,2-Bie)（H;O）;]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;, 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.