Qi-Long Zhang

Syntheses, structures, and luminescence properties of anion-controlled heterometal modular coordination polymers based on a metalloligand

Three new heterometallic coordination polymers (CPs) formulated as [NiAg3(acac)3(NO3)2(H2O)]n (2), [NiAg3(acac)3(ClO4)2(EtOH)2]n (3), and [NiAg2(acac)2(CF3SO3)2(H2O)2]n (4) have been obtained following a synthetic strategy of introducing AgX (X = NO3−, ClO4−, CF3SO3−) to react with a metalloligand [Ni(acac)2(EtOH)2]n (1, Hacac = acetylacetone). Their structures have been determined by single-crystal X-ray diffraction analyses and compounds 2–4 are further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. Complex 2 displays an unprecedented three-dimensional (3D) inorganic chiral framework with novel 5-nodal (3,3,4,4,4)-connected (4.82.103)2(42.6)(42.8.103)(43)(44.62)2 topology. Complex 3 possesses 2D inorganic layers holding 7-nodal (3,3,3,3,4,4,4,4)-connected (4.102)2(42.103.12)(42.6)(43)(44.62)2 networks. Complex 4 shows a 2D (4,5)-connected 4,5-L30 layered architecture with (33.4.62.74)(33.42.5) topology. The anions in compounds 2–4 are crucial factors for the formation of the different structures. In addition, the photoluminescent properties of compounds 2–4 are investigated in the solid state at room temperature.

Square-planar nickel(II) complexes with a tridentate Schiff base and monodentate heterocycles: self-assembly to dimeric and one-dimensional array via hydrogen bonding

Square-planar nickel(II) complex with tridentate ONO-donor 4-[(2-hydroxyphenyl)imino]-2-pentanone (H2hpac) and imidazole (Himdz) are reported. The complex was synthesized in moderate yield by reacting Ni(O2CCH3)2 · 4H2O, H2hpac and imidazole in 1 : 1 : 1 mole ratio and characterized by elemental analysis, IR, 1H NMR spectroscopy. An X-ray structure determination of the complex has been completed. In the solid state, a one-dimensional assembly of the [Ni(hpac)(Himdz)] molecules is formed via intermolecular hydrogen bonds between the imidazole N–H groups and the coordinated hydroxyphenyl-O atoms.

Anion-controlled assembly of Ag(I) coordination polymers based on cis/trans-bis(acetylacetone)-1,4-cyclohexanediimine ligands: syntheses, structures, and solid-state luminescence

Abstract Two isomorphic acetylacetone-based complexes: trans-bis(acetylacetone)-1,4cyclohexanediimine (TBAC) and cis-bis(acetylacetone)-1,4-cyclohexanediimine (CBAC) were designed to promote complex formation on reaction with AgX (X = , , , , and ) and were employed to generate nine silver coordination polymers (CPs), {[Ag(TBAC)]·2H2O·BF4}n (1), [Ag(TBAC)0.5(NO3)]n (2), [Ag2(TBAC)2(ClO4)2]n (3), [Ag(TBAC)(CF3SO3)(H2O)]n (4), {[Ag(TBAC)2]·SbF6}n (5), {[Ag(CBAC)]·BF4}n (6), {[Ag(CBAC)(H2O)]·ClO4}n (7), {[Ag(CBAC)(H2O)]·CF3SO3}n (8), and {[Ag(CBAC)(H2O)]·SbF6}n (9) that exhibit structural and topological diversity as determined by single-crystal X-ray diffraction analyses. The complexes were further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Complex 1 exhibited a 3-D (4,4)-connected pts topology with the Schläfli symbol of (42·84). The anions in 2 are μ2-bridging linkers, connecting the 1-D [Ag(TBAC)0.5]n chains to 2-D (3,4)-connected nets. In 3, TBAC is a tridentate ligand to bind Ag(I) ions to form a 1-D ladder-like supramolecular structure. Complex 4 has 2-D (3,3)-connected nets where both Ag(I) ions and TBAC ligands are 3-connected nodes. Complex 5 has a 1-D fishbone chain structure where some of the TBAC moieties are bidentate. The cis-isomer, CBAC, gives similar (3,3)-connected networks where the Ag(I) ions and CBAC ligands are 3-connected nodes in the resultant 6–9. Although the host networks in 6–9 are supramolecular isomers, structural comparisons revealed that use of cis- and trans-isomers of the ligand and different counterions significantly influence the structures. The luminescent properties of all complexes and ligands were investigated.

CCDC 817596: Experimental Crystal Structure Determination

Related Article: Qi-Long Zhang, Yun-Qian Zhang, Bi-Xue Zhu|2011|Gaodeng Xuexiao Huaxue Xuebao|32|2187|

3,3'-Dibromo-4,4'-[(1R,2R)-cyclohexane-1,2-diyldiimino]dipent-3-en-2-one.

The asymmetric unit of the title compound, C16H24Br2N2O2, contains two independent molecules, each which has two intramolecular N—H⋯O hydrogen bonds linking the amine N atoms to the enolic O atoms of the same acacH-imine unit. In the crystal, the molecules are lined up by intermolecular weak C—H⋯O hydrogen bonds, forming two vertical each other two-dimensional chains along the a axis and b axis of the unit cell, respectively.

4-(4-Oxopent-2-en-2-yl-amino)-1,2,4-triazol-1-ium-5-thiol-ate.

In the title compound, C8H12N4OS, an intramolecular N—H⋯O hydrogen bond links the imine N atom to the oxo O atom. In the crystal, molecules are linked by intermolecular N—H⋯O and N—H⋯S hydrogen bonds, forming a two-dimensional framework.

5,7-Dihydroxy-6,4'-dimeth-oxyflavone.

In the title compound, C17H14O6, the benzopyran ring system is essentially planar and forms a dihedral angle of 6.84 (4)° with the other benzene ring. In the crystal structure, centrosymmetrically related molecules are linked into dimers by O—H⋯O hydrogen bonds. The crystal packing is controlled by C—H⋯π and π–π stacking interactions involving the benzopyran and benzene rings, with centroid–centroid distances between 3.645 (2) and 3.986 (2) Å.

1,3-Bis(2-aminophenoxy)propan-2-ol

In the structure of the title compound, C15H18N2O3, the two benzene rings are linked by an ethereal chain, forming a non-coplanar structure. The crystal structure exhibits a layer formation. The structure displays N—H⋯O, N—H⋯N and O—H⋯N hydrogen bonding.