A self-calibrating dual responsive platform for the sensitive detection of sulfite and sulfonic derivatives based on a robust Hf(iv) metal-organic framework.

A robust hafnium-based metal organic framework, Hf-PBTA, with sensitive and self-calibrating dual-emissive fluorescence response towards sulfite and sulfonic derivatives, including antibiotic sulfamethazine, has been developed, which shows fast detection of sulfite ions at a concentration as low as 76 ppb. The opposite response tendency from two radiative pathways towards aromatic sulfonic molecules and sulfite anions stems from the synergistic effect of the pyridine protonation effect, π-π stacking interaction and intramolecular twist motion.

A Dual Associated-Functional Fluorescent Switch: From Alternate Detection Cycle for Fe(III) and pH to Molecular Logic Operations.

With the expansion and deepening of scientific research, dual-functional or multifunctional materials are urgently needed to replace those for single application. Herein, a fluorescence sensing system based on an In(III)-organic complex with in situ Lewis acid sites has been constructed, exhibiting high sensitivity for the detection of Fe(III) ions with a low detection limit of 3.95 μM and a short response time of within 10 s.

Different conjugated system Zn(ii) Schiff base complexes: supramolecular structure, luminescent properties, and applications in the PMMA-doped hybrid materials.

A series of Zn(ii) complexes with different conjugated systems, [ZnL1Cl] (Zn1), [ZnL2Cl] (Zn2), [Zn(L3)]·(ClO) (Zn3), [ZnL4Cl] (Zn4), and [ZnL5Cl] (Zn5), were synthesized and subsequently characterized via single crystal X-ray diffraction, H and C NMR, FT-IR, elemental analyses, melting point, and PXRD. The X-ray diffraction analyses revealed that the supramolecular frameworks of complexes Zn1-Zn5 are constructed by C-HO/Cl hydrogen bonds and ππ interactions. Complexes Zn1-Zn3 feature 3D 6-connected {4·6} topological structures, whereas complex Zn4 exhibits a 3D 7-connected supramolecular framework with a {4·6} topological structure.

HONHCl optimized CHNHPbI films for improving performance of planar heterojunction perovskite solar cells via a one-step route.

Planar heterojunction perovskite solar cells (PHJ-PSCs) constructed with one-step precursor solution spin-coating deposition (OPSSD) usually give an extremely low performance mainly due to the poor morphology and low crystallinity of the perovskite films. In this work, by incorporating a suitable HONHCl additive in the perovskite precursor solution, a high quality perovskite film with improved morphology and crystallinity was obtained. The UV-vis measurement of the CHNHI solutions without and with HONHCl demonstrates that the improved quality of the perovskite film can be easily attributed to a combined effect of N, I, HO and CHNHCl originating from the oxidation of CHNHI triggered by the HONHCl additive, which can manipulate the crystallization process of the perovskite.

Thermally-induced single-crystal-to-single-crystal transformations from a 2D two-fold interpenetrating square lattice layer to a 3D four-fold interpenetrating diamond framework and its application in dye-sensitized solar cells.

In this work, a rare 2D → 3D single-crystal-to-single-crystal transformation (SCSC) is observed in metal-organic coordination complexes, which is triggered by thermal treatment. The 2D two-fold interpenetrating square lattice layer [Cd(IBA)2]n (1) is irreversibly converted into a 3D four-fold interpenetrating diamond framework {[Cd(IBA)2(H2O)]·2.5H2O}n (2) (HIBA = 4-(1H-imidazol-1-yl)benzoic acid).

[Study on the Structure and Photoluminescent Properties of Mono-Zn(Ⅱ) and Di-Cu(Ⅰ) Complexes Constructed from Nitrogen Heterocyclic Ring Ligand].

The mononuclear Zn(Ⅱ) complex [Zn(2,6-PDA)(phen)H2O]·H2O (1) and binuclear Cu(Ⅰ) complex{[Cu(μ-Ⅰ)(phen)H2O]·H2O}2 (2) (2,6-H2PDA=2,6- pyridinedicarboxylic acid，phen=1,10- phenanthroline monohydrate) have been prepared with hydro-thermal synthesis method. These complexes have been characterized with single-crystal X-ray, elemental analysis, and IR spectroscopy. The fluorescence spectra of 1 and 2 are studied in solid-state and dimethyl sulfoxide (DMSO) solution.

Advanced Cd(II) complexes as high efficiency co-sensitizers for enhanced dye-sensitized solar cell performance.

This work reports on two new complexes with the general formula [Cd3(IBA)3(Cl)2(HCOO)(H2O)]n (1) and {[Cd1.5(IBA)3(H2O)6]·3.5H2O}n (2), which can be synthesized by the reaction of Cd(II) with rigid linear ligand 4-HIBA containing imidazolyl and carboxylate functional groups [4-HIBA = 4-(1H-imidazol-1-yl)benzoic acid].

Tunable Luminescence and Application in Dye-Sensitized Solar Cells of Zn(II)/Hg(II) Complexes: Methyl Substitution-Induced Supramolecular Structures Based on (E)-N-(6-Methoxypyridin-2-ylmethylene)arylamine Derivatives.

Using Schiff-base ligands (E)-N-(6-methoxypyridin-2-yl)(CH═NAr) (where Ar = C6H5, L1; 2-MeC6H4, L2; 2,4,6-Me3C6H2, L3), six Zn(II)/Hg(II) complexes, namely, [ZnL1Cl2] (Zn1), [HgL1Cl2] (Hg1), [ZnL2Cl2] (Zn2), [HgL2Cl2] (Hg2), [ZnL3Cl2] (Zn3), and [HgL3Cl2] (Hg3) have been synthesized under solvothermal conditions. The structures of six complexes have been established by X-ray single-crystal analysis and further physically characterized by EA, FT-IR, (1)H NMR, and ESI-MS. The crystal structures of these complexes indicate that noncovalent interactions, such as hydrogen bonds, C-H···Cl, and π···π stacking, play essential roles in constructing the resulting supramolecular structures (1D for Hg3; 2D for Zn2, Hg2; 3D for Zn1, Hg1, and Zn3).

[A purple-emitting luminescence complex [Cd(bpdc)(phen)2(H2O)] . 6H2O: synthesis, structure and spectral properties].

A supramolecular Cd(II) complex[Cd(bpdc) (phen)2 (H2O)] . 6H20 (1) was synthesized with 2, 4'-biphenyldicarboxylic acid (H2bpdc) and 1, 10-phenanthroline (phen) under hydrothermal conditions and characterized by single-crystal X-ray diffraction elemental analysis, and IR spectrum. Single-crystal X-ray analysis reveals complex 1 crystalizes in the triclinic P 1 space group, the metal center Cd(II) ion is six-coordinated and exhibits a distorted octahedron geometry arrangement.

Facile luminescent tuning of Zn(II)/Hg(II) complexes based on flexible, semi-rigid and rigid polydentate Schiff bases from blue to green to red: structural, photophysics, electrochemistry and theoretical calculations studies.

The photophysical properties of Zn(II)/Hg(II) Schiff base complexes could be fine and predictably tuned over a wide range of wavelengths by changing the ligand structures. A new series of polydentate Schiff base-type ligands, N,N'-bis(2-pyridinylethylidene)R(3)-1,2-diamine (), which contain a flexible, semi-rigid or rigid group (R(3) = butyl, cyclohexane, tolyl and phenylene), has been designed and employed for synthetizing new mononuclear or binuclear trans Zn(II)/Hg(II) complexes with a general formula of [M()Cl2] ( = N,N'-bis(2-pyridinylethylidene)phenylene-1,2-diamine, M = Zn, ; M = Hg, ), [M()Cl2] ( = N,N'-bis(2-pyridinylethylidene)toluene-3,4-diamine, M = Zn, ; M = Hg, ), [M2()Cl4]·nCH2Cl2 ( = N,N'-bis(2-pyridinylmethylene)cyclohexane-1,2-diamine, M = Zn, n = 0, ; M = Hg, n = 1, ), [M2()Cl4]·nCH3OH ( = N,N'-bis(2-pyridinylethylidene)cyclohexane-1,2-diamine, M = Zn, n = 1, ; M = Hg, n = 0, ), [M2()Cl4] ( = N,N'-bis(3-methoxy-2-pyridinylmethylene)-cyclohexane-1,2-diamine, M = Zn, ; M = Hg, ), [M2()Cl4]·nCH3CN ( = N,N'-bis(3-methoxy-2-pyridinylmethylene)butane-1,4-diamine, M = Zn, n = 4, ; M = Hg, n = 0, ). All the ligands and complexes have been characterized by elemental analyses, IR spectra, and (1)H NMR spectra.

Solvatochromic and application in dye-sensitized solar cells of sandwich-like Cd(II) complexes: supramolecular architectures based on N(1),N(3)-bis[(6-methoxypyridin-2-yl)methylene]benzene-1,3-diamine.

A novel polydentate Schiff base ligand N(1),N(3)-bis[(6-methoxypyridin-2-yl)methylene]benzene-1,3-diamine (L) and its two dinuclear sandwich-like complexes {[CdL(NO3)(H2O)]·NO3}2 (1) and {[CdL(CH3CN)(H2O)]·(ClO4)2·(CH3CN)2}2 (2) were synthesized. Both C-H∙∙∙O, C-H∙∙∙N and π-π non-covalent interactions had essential roles in constructing the resulting three-dimensional supramolecular networks. L emits a more intense blue-green fluorescence emission around 493 nm than in dilute solution, exhibiting stacking-induced emission properties.

Synthesis and characterization of substituted Schiff-base ligands and their d(10) metal complexes: structure-induced luminescence tuning behaviors and applications in co-sensitized solar cells.

Nine IIB group complexes, [ZnL1Cl2] (Zn1), [CdL1Cl2]2 (Cd1), [HgL1Cl2] (Hg1), [ZnL2Cl2] (Zn2), [CdL2Cl2] (Cd2), [HgL2Cl2] (Hg2), [ZnL3Cl2] (Zn3), [CdL3Cl2] (Cd3) and [HgL3Cl2] (Hg3), have been synthesized from the corresponding ortho-(6-methoxy-pyridyl)(CH[double bond, length as m-dash]NAr) (where Ar = 2,6-iPr2C6H3, L1; 4-MeC6H4, L2; 2-OMeC6H4, L3) Schiff base and structurally characterized by elemental analysis, FT-IR, (1)H NMR and X-ray single-crystal analysis. Crystallographic studies reveal that the center metal of the complexes adopts a distorted tetrahedron geometry (except for Cd1 and Cd3, which display square pyramidal geometry) and C-HCl hydrogen bonds and ππ stacking interactions contribute to three-dimensional supramolecular structures. The series of complexes exhibit tunable luminescence from blue, through green, to light yellow by varying the temperature (298 K and 77 K), both in solution and in the solid state.

Preparation, characterization, and properties of PMMA-doped polymer film materials: a study on the effect of terbium ions on luminescence and lifetime enhancement.

Poly(methylmethacrylate) (PMMA) doped with Tb-based imidazole derivative coordination polymer {[Tb(3)(L)(μ(3)-OH)(7)]·H(2)O}(n) (1) (L = N,N'-bis(acetoxy)biimidazole) was synthesized and its photophysical properties were studied. The L'(L' = N,N'-bis(ethylacetate)biimidazole) ligand was synthesized by an N-alkylation reaction process followed by ester hydrolysis to produce ligand L. Polymer 1 and ligand L' have been characterized by (1)H NMR and IR spectroscopy, elemental analysis, PXRD and X-ray single-crystal diffraction.

Crystal transformation synthesis of a highly stable fluorescent 3D indium-tetranuclear {In4(μ2-OH)3} building block based metal organic framework through a dinuclear complex.

A rare 3D tetranuclear {In4(μ2-OH)3} building block based MOF {[In4/3(μ2-OH)(2,6-pydc)(1,4-bda)0.5(H2O)]·2H2O}n (2) was obtained through a crystal transformation from a dimeric complex In3(2,6-pydc)3(1,4-bda)1.5(H2O)6 (1).

Tunable luminescence from rare 2D Ga(III)/In(III) coordination polymers coexisting with three different conjugated system aromatic ligands.

Two rare 2D Ga/In-based coordination polymers in which one metal center coexists with three distinct aromatic ligands were synthesized. Helical channels along the 21 screw axis are exhibited to form a hcb net. The compounds exhibit tunable fluorescence from blue, green, white to yellow light by varying the temperature and solvents.

Photocurrent enhanced dye-sensitized solar cells based on TiO2 loaded K6SiW11O39Co(II)(H2O)·xH2O photoanode materials.

Through loading of TiO2 on the surface of K6SiW11O39Co(II)(H2O)·xH2O (SiW11Co), a novel photoanode material has been created for dye-sensitized solar cells (DSSC). The absorbing band as well as photoelectricity response range of TiO2@SiW11Co is extended to the visible range. In addition, the absorption in the UV range is enhanced notably compared with P25 (raw TiO2).

[Synthesis, crystal structure and spectral properties study of a 3D netlike coordination polymer [Zn(HBIDC) x H2O]n].

The 3D netlike coordination polymer of Zn II with benzimidazole-5,6-dicarboxylic acid (H3BIDC), [Zn(HBIDC) x H2O]n was synthesized by the hydrothermal method through self-assembling. The crystal structure of complex 1 was characterized by single-crystal X-ray diffraction, elemental analysis and IR spectra, and we also studied the fluorescence properties of complex 1 in DMSO and in the solid state with UV-Vis absorption spectra, fluorescence spectra and fluorescence lifetime. Complex 1 has blue luminescence in solutions of DMSO with emission band at 481 nm; and has blue luminescence in the solid state at room temperature with a strong emission band at 493 nm, and these all can be attributed to the pi* --> pi transition based on the benzimidazole-5,6-dicarboxy acid.

[Synthesis, characterization and luminescence properties of a copper (I) complex].

Binuclear complex [Cu2 (mu-I)2 (phen)2] x CH3CN(1)(phen = 1,10-phenanthroline) was synthesized under solvothermal conditions and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. X-ray diffraction analysis reveals that complex 1 is monoclinic, space group P2(1/n), and the cell parameters are: alpha = 10.505 A, b = 23.

High efficiency co-sensitized solar cell based on luminescent lanthanide complexes with pyridine-2,6-dicarboxylic acid ligands.

Two lanthanide complexes, Ln(HPDA)(3)·4EtOH (Ln = Tb, Dy) (H(2)PDA = pyridine-2,6-dicarboxylic acid, EtOH = ethanol), have been successfully synthesized using hydrothermal or solvothermal methods, and their crystal structures were analyzed by single crystal XRD. Both crystals have orthorhombic symmetry with space group Pbcn, exhibiting three-dimensional (3D) supramolecular architecture through hydrogen bonding interactions. The metal center was coordinated to nine atoms by three pyridine-2,6-dicarboxylic acid ligands.

N,N'-Bis[1-(pyridin-2-yl)-ethyl-idene]benzene-1,4-diamine.

In the title compound, C(20)H(18)N(4), the benzene ring lies about an inversion center. The central benzene-1,4-diamine unit is connected to two pyridine rings by the C=N imine bonds. The dihedral angle between the benzene and pyridine rings is 82.

(E)-2,4,6-Trimethyl-N-(pyridin-2-yl-methyl-idene)aniline.

In the title compound, C(15)H(16)N(2), has an E conformation about the central N=C bond. The benzene and pyridine rings are almost normal to one another with a dihedral angle of 87.47(8)°.

[Hydrothermal synthesis, crystal structure and luminescence property of 3D supermolecular compound [Zn(H2O)6].(C16H8O8)].

A supermolecular compound [Zn(H2O)6].(C16H8O8) was synthesized with 3,3', 4,4'-bipthenyltetracarboxylic acid (H4BPTC) and Zn(CH3COO)2.2H2O.

[Synthesis, crystal structure and luminescent properties of a dysprosium coordinaation polymer based on pyridine-2, 6-dicarboxylic acid].

2-D layered Dy coordination polymer [Dy(PDA) (HPDA)I]n (1)(H2PDA = pyridine-2,6-dicarboxylic acid) with (4.8(2)) topological network was synthesized under hydrothermal conditions and was characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. X-ray diffraction analysis reveals that compound 1 is monoclinic, space group P2(1)/c.

Tetra-μ-acetato-κO:O';κO,O':O;κO:O,O'-bis-[(acetato-κO,O')(1,10-phenanthroline-κN,N')europium(III)].

In the title centrosymmetric dinuclear complex, [Eu(2)(CH(3)CO(2))(6)(C(12)H(8)N(2))(2)], the Eu(III) atom is nine-coordinated by two N atoms from a 1,10-phenanthroline ligand and seven O atoms from five acetate ligands (two bidentate, three monodentate). The crystal structure is stabilized by π-π stacking inter-actions between the pyridine and benzene rings of adjacent mol-ecules, with a centroid-centroid distance of 3.829 (2) Å.

2,6-Bis[1-(2-methyl-phenyl-imino)eth-yl]pyridine.

The mol-ecule of the title compound, C(23)H(23)N(3), which was synthesized by the condensation reaction between 2,6-diacetyl-pyridine and 2-dimethyl-aniline, adopts an E configuration about both C=N imine bonds. The dihedral angles formed by the benzene rings with the pyridine ring are 89.68 (5) and 53.