Anions effect construction of 1D naphthalene diimide supramolecular chains by π interactions and fluorescence detect iodide anion

Five diverse 1D supramolecular chains, {[4-pmntd]}_n(1), {H₂[4-pmntd]•2Br^-}_n(2), {H₂[4-pmntd]•2NO₃^-}_n(3), {H₂[4-pmntd]•2ClO₄^-}_n(4), {H₂[4-pmntd]•2BF₄^-}_n(5), (where 4-pmntd was N,N'-bis (4-pyridylmethyl)naphthalene diimide) were synthesized and characterized by X-ray single-crystal structure analysis, IR spectroscopy, elemental analyses, thermogravimetric analyses, fluorescence detection. The anions effect construction of their 1D chain structural diversity through different π interactions. Compound 1 through the adjacent pyridine rings parallel π∙∙∙π interactions formed 1D linear chain structure. Compound 2 through Br^- anion∙∙∙π interactions and halogenbond interactions formed 1D zigzag chain structure. Compound 3 through lone pair∙∙∙π interactions of naphthalene diimide and the adjacent carboxyl group formed 1D stairway chain structure. Compound 4 through ClO₄^- anion∙∙∙π interactions formed 1D ribbon chain structure. Compound 5 through parallel π∙∙∙π interactions of the adjacent naphthalene diimide planes and pyridine rings formed 1D ladder chain structure. The five compounds' fluorescence properties and thermal stabilities were investigated. The compound 2 solution could fluorescence detection for iodide anion via fluorescence quenching.

Diverse 1D chains supramolecular structures of N,N'-bis(3-pyridylmethyl)pyromellitic diimide and fluorescence iodide sensing

Three diverse supramolecular compounds, {[3-pmpmd]}_n(1), {H₂[3-pmpmd]·2NO₃^-}_n(2), {H₂[3-pmpmd]·2tbb}_n(3), (where 3-pmpmd was N,N'-bis(3-pyridylmethyl)pyromellitic diimide; tbb was tertiary butyl benzoic acid) were synthesized and characterized by elemental analyses, IR spectroscopy, thermogravimetric analyses, and X-ray single-crystal structure analysis. The co-crystal anions affect their structural diversity. Compound 1 is a 1D stairway chain structure by perpendicular π⋯π interactions of pyromellitic diimide and the neighboring pyridine rings. Compound 2 is a typical 1D ladder chain structure by hydrogen bond of nitrate arranged in a parallel array. Compound 3 is a 1D zigzag chain structure of one 3-pmpmd and two tbb by parallel π⋯π interactions and hydrogen bond interactions. Thermal stabilities and fluorescence properties of all compounds were investigated. The solution of compound 2 in DMF can fluorescence sense for iodide ions by remarkably quenching fluorescence intensity.

Two zinc coordination polymers with photochromic behaviors and photo-controlled luminescence properties

Two new coordination polymers, [Zn(3-NDI)_0.5(NDC)(DMF)]_n (1) and {[Zn_1.5(3-NDI)_0.5(BDC)_1.5]·2.5DMF}_n (2), were synthesized. Both complexes show photochromic behaviors and have obvious fluorescence quenching behaviors upon irradiation.

Selective Adsorption of Water, Methanol, and Ethanol by Naphthalene Diimide-Based Coordination Polymers with Constructed Open Cu2+ Metal Sites and Separation of Ethanol/Acetonitrile

The selective separation of ethanol/acetonitrile by porous materials has rarely been observed owing to their similar physicochemical properties. In this work, we report a new coordination network, [Cu₂(4-pmntd)₂(opd)₂](4-pmntd = N,N'-bis(4-pyridymethy)naphthalene diimide, opd = disodium 1,2-benzenedicarboxylate), which exhibits selective separation of ethanol over acetonitrile. The weak coordination bonds formed by unsaturated Cu²⁺ sites and hydroxyl groups are the key to such performance.

Crystallographic studies of 2-picolyl substituted naphthalene diimide and bis-phthalimide ligands and their supramolecular coordination chemistry

The coordination chemistry of two 2-picolyl substituted bis-imide ligands is explored, revealing fascinating metallosupramolecular assemblies but an apparent barrier to chelation compared to monoimide congeners.

Diverse cobalt(ii) coordination polymers for water/ethanol separation and luminescence for water sensing applications

N,N′-Bis(3-pyridylmethyl)pyromellitic diimide has four conformations, which lead to four types of cobalt(ii) coordination polymers. Such coordination networks can be used for luminescent water sensing and water/ethanol separation.

Synthesis, crystal structure, fluorescence properties of 1D chain Manganese (II) and Cadmium (II) complexes

Two complexes, {[Mn(3-pmpmd)₂(Cl)₂]·2H₂O}_n(1), {[Cd(3-pmpmd) (I)₂]·CHCl₃·H₂O}_n(2), (3-pmpmd, N,N'-bis(3-pyridylmethyl)pyromellitic diimide) were synthesized and characterized by elemental analyses, IR spectroscopy, thermogravimetric analyses, and X-ray single-crystal structure analysis. The conformations of 3-pmpmd ligand affect their structural diversity. Complex 1 is a 1D double chain structure in edge-to-edge arrangement by π⋯π interactions. Complex 2 is a typical 1D zigzag chain structure arranged in a parallel array containing 1D channel to accommodate the chloroform and water guest molecules. Thermal stabilities and fluorescence properties of both complexes were investigated. The solution of complex 2 in DMF can sense for I^- anion by quenching fluorescence intensity, whereas other anions increasing fluorescence intensity.

Supramolecular structural transformation of N,N′-bis(4-pyridylmethyl)-naphthalene diimide and fluorescence water sensing

The supramolecular organic structure exhibits reversible dehydration/rehydration in a single-crystal-to-single-crystal process, selective adsorption of CO₂ over N₂ as well as H₂ and sorption selectivity for water and fluorescence sensing of water.

A Naphthalenediimide-Based Metal-Organic Framework and Thin Film Exhibiting Photochromic and Electrochromic Properties

A multifunctional metal-organic framework, NBU-3, has been explored as a 2D three-connected network based on a naphthalenediimide-based ligand. The NBU-3 crystals display photochromic properties, and NBU-3 thin films on FTO substrates exhibit electrochromic properties. NBU-3 is the first example of MOF materials containing both photochromic and electrochromic properties, which can be desirable for thin film devices.

Crystal structure of 4,4'-[(1,3,5,7-tetra-oxo-1,3,3a,4,4a,5,7,7a,8,8a-deca-hydro-4,8-etheno-pyrrolo-[3,4-f]iso-indole-2,6-di-yl)bis-(methyl-ene)]bis-(pyridin-1-ium) dinitrate

In the title salt, C24H22N4O4 (2+)·2NO3 (-), the cation is U-shaped with the two iso-indole dione rings inclined to one another by 60.41 (13)°, while the two outer pyridine rings are inclined to one another by 2.77 (12)°. The dihedral angles between the pyridine ring and the adjacent iso-indole dione ring are 71.82 (12) and 86.44 (13)°. In the crystal, each nitrate anion is linked to a protonated pyridine ring by N-H⋯O hydrogen bonds. These units are linked by a series of C-H⋯O hydrogen bonds, forming a three-dimensional structure.

Crystal structures, topologies and luminescent properties of three Zn(ii)/Cd(ii) coordination networks based on naphthalene-2,6-dicarboxylic acid and different bis(imidazole) linkers

Three new coordination polymers (CPs) based on H₂ndc acid have been synthesized and structurally characterized. Three CPs exhibit structural diversity depending on different bis(imidazole) bridging ligands and center metal ions.

Structures and multiple properties of two polar metal–organic frameworks based on achiral N,O-coordinated ligands: toward multifunctional materials

Reported here are two polar MOFs with combined PL and SHG response or combined antiferromagnetism and photocatalysis properties.

((1H-tetrazol-5-yl) methyl) pyridine-based metal coordination complexes: in situ tetrazole synthesis, crystal structures, luminescence properties

Six novel transition metal coordination complexes based on pyridyltetrazole ligands have been hydrothermally in situ synthesized.