A new complex with the formula [Co（acac）_2（NITQ）_2]×2CH_2Cl_2 1（acac = acetylacetone, NITQ = 2-（2′-quinoxalinyl）-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide）, was synthesized and elucidated structurally as well as magnetically in detail. The crystal belongs to the monoclinic system, space group P2_1/c with a = 9.6896（1）, b = 20.539（4）, c = 12.147（2） ？, β = 93.84（3）°, M_r = 997.65, V = 2412.1（8） ？~3, Z = 2, Dc = 1.374 g/cm, F（000） = 1038, m = 0.635 mm^（-1）, the final R = 0.0539 and w R = 0.1289 for 5998 observed reflections（I 〉 2σ（I））. The Co（Ⅱ） ion is coordinated by two nitrogen atoms of quinoxaline rings from two NITQs and four oxygen atoms from two acac ions to complete a distorted octahedral coordination environment. Compound 1 is further linked into a three-dimensional（3D） supramolecular network by hydrogen-bonding, Cl×××O weak contact and π···π stacking interactions. The magnetic measurements show compound 1 exhibits weak ferromagnetic interactions.
A new complex, [Ni（acac）2（NITQ）2]-2CH2C12 1 （acac = acetylacetone, NITQ = 2-（2＂-quinoxalinyl）-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide）, was synthesized and charac- terized by elemental analysis, IR spectroscopy, UV-Vis absorption spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/c with a = 9.6970（19）, b = 20.410（4）, c = 12.166（2） A, β = 93.89（3）°, Mr = 997.43, V= 2402.3（8） A3, Z = 2, Dc = 1.379 g/cm3, F（000） = 1040,μ = 0.684 mm-1, the final R = 0.0423 and wR = 0.1197 for 2884 observed reflections （1 〉 2σ（I））. Compound 1 is found to assume a mononuclear structure, which is further linked into a three-dimensional （3D） supramolecular network by hydrogen-bonding, C1...O weak contact and π...π stacking interactions. Moreover, the luminescent properties of the ligand and compound 1 were further investigated in detail.
A new complex with formula [Cd（3-pbpmb）2 I2]n 1（3-pbpmb = 1,4-bis（pyridine-3-ylmethoxy）benzene）, has been solvothermally synthesized and characterized. The crystal belongs to monoclinic system, space group P21/n with a = 8.2905（17）, b = 16.078（3）, c = 13.213（3）A, β = 99.44（3）°, Mr = 950.86, V = 1737.3（6） A^3, Z = 2, Dc = 1.818 g/cm^3, F（000） = 924, m = 2.450 mm（-1）, the final R = 0.0198 and w R = 0.0467 for 3053 observed reflections（I ＆gt; 2σ（I））. The Cd（Ⅱ） ion is coordinated by four N atoms of four 3-pbpmb ligands and two iodine ions to furnish a distorted octahedral coordination geometry. The Cd（Ⅱ） ion and its own symmetry-related ions are bridged by N atoms from two 3-pbpmb ligands to generate a ＂zigzag＂ 1-D chain coordination polymer. These 1D chains are further connected into a three-dimensional（3D） framework by C–H×××pinteractions and intermolecular C–H×××I hydrogen bond. Interestingly, 1 displays efficient sorption of molecular iodine gas（up to 111 wt%）, but invalid sorption of molecular water gas.
