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]·2CH_2Cl_2 1(acac=acetylacetone,NITQ=2-(2'-quinoxalinyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide),was synthesized and characterized by elemental analysis,IR spectroscopy,UV-Vis absorption spectrum,and single-crystal X-ray diffraction.The crystal belongs to the monoclinic system,space group P2_1/c with a=9.6970(19),b=20.410(4),c=12.166(2)A,β=93.89(3)°,M_r=997.43,V=2402.3(8)A^3,Z=2,D_c=1.379 g/cm^3,F(000)=1040,μ=0.684 mm^(-1),the final R=0.0423 and wR=0.1197 for 2884observed reflections(I>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,Cl…O weak contact andπ…πstacking 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 I_2]_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) ?, β = 99.44(3)°, Mr = 950.86, V = 1737.3(6) ?~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 > 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.
