A lead(II)-orotate coordination polymer with a new coordination mode: Synthesis,structure and luminescent property

A lead(II) orotate complex [Pb(HOr)(H₂O)]_n (1), (H₃Or = orotic acid) was synthesized under hydrothermal condition and characterized by X-ray diffraction, IR, solid-state photoluminescence and thermogravimetric analysis. Lead atom in 1 is in a holodirected eight-coordinated polyhedron and the orotate ligand exhibits a new and unique hexametallic coordination mode. The lead complex shows a 6,6-connected (4⁸, 6⁶, 8)(4¹³, 6²) topology. The complex exhibits photoluminescence at 546 nm (λ_ex = 350 nm).     

A novel pentanuclear Zn(II) coordination polymer with double helices: Synthesis,structure and luminescent property

A novel 3D coordination polymer, [Zn₅(hqc)₄(μ₃-OH)₂]_n (1), has been prepared by hydrothermal reaction and characterized by elemental analyses, TGA, and single-crystal X-ray diffraction analysis. Compound 1 is built by hqc²⁻ ligands bridging pentanuclear Zn(II) SBUs, [Zn₅(μ₃-OH)₂], and there is coexistence of left-, and right-handed double helical chains in the 3D network. It represents the first pentanuclear Zn(II) coordination polymers with double helices constructed from quinoline-based carboxylic acid. In addition, the fluorescent property of compound 1 was also determined, which exhibits blue fluorescence at 441 nm in the solid-state upon excitation at 330 nm.     

A tubular luminescent Zn(II) coordination polymer with unsymmetrical bridge ligand

A novel 1D tubular coordination polymer [ZnL(dca)₂]_n (dca = dicyanamide, L = 2-(3-pyridylmethylthio)-5-(4-pyridyl)-1,3,4-oxadiazole) constructed by the unsymmetrical bridge ligands L spirally winding around two double-chain pillars Zn(dca)₂ was synthesized and characterized.     

Construction of a new 3D Zn(II) coordination polymer with (4,6)-connected topology: Synthesis,structure and luminescence

A new coordination polymer of {[Zn₂(odpa)(IP)]·4H₂O}_n (1) (H₄odpa = 3,3′,4,4′-oxydiphthalic acid and IP = 1-H-imidazo[4,5-f][1,10]-phenanthroline), is reported. The 3D (4,6)-connected {4⁴∙6²∙8⁸∙12}{4⁴∙6²} topology net is formed by IP and odpa ligands in 1. Interestingly, the IP ligand acts as a tridentate mode and extends the resulting 3D feature. The luminescence study indicates that the title compound emits bright red fluorescence.     

Synthesis,crystal structure and photoluminescent properties of a 3D Zn(II) coordination polymer

A new 3D coordination polymer [NH₂(CH₃)₂]₂[Zn₇L₄(DMF)₂(H₂O)₃]·19H₂O (1) (L = 2,3′,5,5′-biphenyl tetracarboxylic acid) has been solvothermally synthesized and structurally characterized by IR, elemental analysis and single-crystal X-ray diffraction. Single-crystal X-ray diffraction studies indicate that 1 exhibits 3D framework with a one-dimensional (1D) channel. The luminescence properties have been studied, and the results showed that 1 displays strong fluorescent emissions both in the solid state and in methanol suspension at room temperature. More interesting, the addition of Fe^3 + causes the fluorescence intensity of 1 to be weakened, which implies that it may be used as luminescent probes of Fe^3 +.     

Synthesis,structure, photoluminescence and theoretical calculation on a novel Zn(II) coordination polymer with (4,8)-connected topology

A new compound, namely [Zn₂(pbdc)_1.5(TAZ)]_n 2nH₂O (1 H₂pbdc = terephthalic acid, HTAZ = 1H-1,2,4-triazole), has been hydrothermally synthesized from H₂pbdc, HTAZ and Cd(II) salts. Single crystal X-ray diffraction analysis reveals that compound 1 represents an unprecedented (4,8)-connected 3D topological network. Notably, two TAZ ligands in uniform μ₃-1,2,4 bridging mode connect four Zn(II) ions together, giving rise to a [Zn₄(TAZ)₂] metallo-ligand subunit, which are further bridged via pbdc ligands in two kinds of coordination modes, resulting in the final 3D complicated framework. The relevant density of states (DOS) calculation result showed that the luminescence of 1 mainly originates from HTAZ intraligand charge transition.     

A 3D-diamond-like coordination network of lead(II) complex: Synthesis,structure and luminescent property

A lead(II) complex [Pb(Hfysh)₂] (1) (H₂fysh = furan-2-ylmethylene salicyloyl hydrazone) has been synthesized and characterized. The lead atom is in a holodirected eight-coordinated polyhedron. There are secondary Pb–O interactions that give rise to a novel 3D-diamond-like coordination network. The luminescent property of 1 in the solid state was investigated.     

Synthesis,crystal structure and photoluminescence of a new Cd(II) coordination polymer with unusual geometry

A new coordination polymer 1 [CdL₂(NO₃)₂]_n (L: 3, 6-di-(1, 2, 4-triazole-1-yl)-N-ethylcarbazole) has been synthesized by self-assembly reaction and characterized by elemental analysis and IR spectroscopy. The single-crystal X-ray diffraction shows that the [CdL₂(NO₃)₂]_n crystallizes in the monoclinic system and C2/m space group and the Cd(II) atom is four-coordinated. The coordination polyhedron can be described as a rectangle which is rather infrequent. The coordination bonds, hydrogen bonds and π–π interactions shaped the 3D network structure. A possible formation mechanism was discussed. The optical property was also studied.     

A three-dimensional highly stable Zn(II) coordination polymer based on 1,4-benzeneditetrazolate (H2BDT): Synthesis,crystal structure,and luminescent properties

1,4-benzeneditetrazolate [H₂BDT] (1) and its 3D coordination polymer [Zn(BDT)]_n (2), have been synthesized and structurally characterized by infrared spectroscopy (IR), thermal gravimetric analysis (TG), and single-crystal/powder X-ray diffraction. The result of the single-crystal X-ray diffraction analysis indicates that 1 is a 3D supramolecular structure stabilized by intermolecular hydrogen bonds and π…π stacking interactions. 2 is a 3D (4,4)-connected coordination polymer with the central metal Zn(II) ions linked together by BDT^2? anions. Photoluminescent measurement for 2 in the solid state elucidates that 2 displays a strong photoluminescence at 469 nm, which suggests that 2 may be a potential blue-light material.     

A new three-dimensional Cu(II) coordination polymer with triaminoguanidin building blocks

The reaction between the tris(2-hydroxybenzylidene)triaminoguanidin hydrochloride (H₆L)Cl and copper(II) chloride in the presence of triethylamine leads to a three-dimensional coordination polymer with two interpenetrating (10,3)-a networks of opposite chirality. Magnetic studies revealed strong antiferromagnetic coupling between copper ions of the spin frustrated trinuclear building unit.     

A novel three-dimensional cadmium(II) coordination polymer constructed from dinuclear molecular building block,syntheses, structure and photoluminescence property

A novel cadmium(II) coordination polymer, [Cd₂(pzdc)₂(4,4′-bpy)₂]·4H₂O (1) (H₂pzdc = pyrazine-2,3-dicarboxylic acid; 4,4′-bpy = 4,4′-bipyridine), has been synthesized by hydrothermal reaction of Cd(OAC)₂, H₂pzdc and 4,4′-bpy. Single-crystal X-ray diffraction analysis reveals that 1 constructed from dinuclear building blocks has a three-dimensional (3-D) structure with rob topology. Fluorescent measurement of 1 exhibits strong blue-green emission in the solid state at room temperature, and its framework possess remarkable thermal stability.     

Synthesis,structure, and luminescence of a novel lead(II) coordination polymer with 1,2-phenylenediacetic acid

A coordination polymer [Pb₂(phda)₂]_n (H₂phda = 1,2-phenylenediacetic acid) was synthesized and characterized by single crystal X-ray diffraction. The complex has a (6, 6)-connected 2D framework with topology of (4¹⁵), in which Pb²⁺…π interaction is observed. The 2D framework is further assembled by C–H…π interactions, resulting in a 3D supramolecular network. The fluorescence of the complex is assigned to the intraligand π^?–π transition and the ligand-to-metal charge transfer.     

A novel 3D Zn(II) coordination polymer for highly luminescent sensing of nitro compounds

A novel 3D coordination polymer [Zn_2.5(L)(trz)₂(H₂O)₂]·2H₂O (1) (H₃L = 5-(4-carboxybenzyloxy)isophthalic acid, trz = 1,2,4-triazole) has been synthesized hydrothermally. Compound 1 displays a 3D (3,8)-connected net with (5³)₂(5⁸·6⁴·7⁸·8⁴·9⁴) topology. The luminescent property of 1 dispersed in different solvents as well as nitro compounds have been investigated systematically, demonstrating high detection sensitivity via a fluorescence quenching mechanism.     

The chiral Zn(II)–Na(I) coordination polymer: Synthesis, crystal structure, thermal and optical properties

The chiral Zn(II)–Na(I) coordination polymer with formula [NaZn(acac)₂(AcO)(EtOH)] (1) has been synthesized, and characterized by ¹H NMR and FT-IR spectra, elemental, X-ray, and thermogravimetric analysis (TGA). X-ray crystallographic study revealed that 1 crystallizes in the non-centrosymmetric space groups P2₁2₁2₁ and exhibits a one-dimensional polymer chain. Linear optical properties were investigated by UV/Vis spectrophotometer techniques. Kurtz–Perry powder second-harmonic-generation (SHG) test confirms the non-linear optical (NLO) property of the grown crystal.     

Magnetic properties and structure of a new one-dimensional azido-bridged nickel(II) coordination polymer

A new one-dimensional nickel(II) coordination polymer with azido-bridge, [Ni(dpa)(N₃)₂] · H₂O 1 (where dpa is the 2,2′-dipyridylamine ligand) has been synthesized and crystal structure was determined by single-crystal X-ray diffraction. Complex 1 exhibits a zig-zag chain structural arrangement, and the hexa-coordinated Ni(II) ion exhibits a distorted octahedral coordination sphere. The chains topologies are built via three EO and one EE azido bridges. The study of the magnetic properties reveals dominating antiferromagnetic interactions between Ni(II) ions through the EE bridges.     

Manganese(II) coordination polymer with simultaneous azide,tetrazolate and carboxylate bridges: Synthesis,structure and magnetism

The reaction of a pyridinium-containing ligand precursor with manganese(II) chloride and sodium azide yielded a Mn(II) coordination polymer, [MnLN₃]_n·1.5nH₂O, where L is 1-(tetrazolato-5-methyl)pyridinium-4-carboxylate, a bifunctional zwitterionic ligand generated in situ from a non-coordinative precursor via two organic reactions (cyano-to-azide cycloaddition and ester hydrolysis). In the compound, metal ions are connected into uniform chains by the triple bridges consisting of μ-1,1-azide, μ-2,3-tetrazolate and μ-1,3-carboxylate, and the formally anionic chains are charge compensated and interlinked into 2D layers by the cationic 1-methylenepyridinium backbone of the L ligand. The compound displays typical 1D antiferromagnetism with J = − 2.37 cm^− 1 through the triple bridges. Magneto-structural analysis indicates the antiferromagnetic interaction increases as the Mn–N–Mn angle of the azide bridge decreases.     

Hydrothermal synthesis and crystal structure of a luminescent 3D lead(II) coordination polymer [Pb(4-cca)]n (4-cca = 4-carboxycinnamate)

A novel lead(II) coordination polymer [Pb(4-cca)]_n (1) was prepared by the hydrothermal reaction of Pb(NO₃)₂ with 4-carboxycinnamic acid (4-H₂cca) and structurally characterized. Single-crystal X-ray diffraction revealed that 1 has a 3D supramolecular architecture constructed by 2D [Pb(COO)₂]_n layers pillared by –Ph–CHCH– spacers. The thermal and luminescent properties of 1 in the solid state were also investigated.