Homochiral Tetraphenylethene-Based Metal-Organic Frameworks with Circularly Polarized Luminescence for Enantioselective Recognition.

A pair of water-stable and highly porous homochiral fluorescent silver-organic framework enantiomers, namely, -Ag-BPA-TPyPE (-) and -Ag-BPA-TPyPE (-), had been prepared as enantioselective fluorescence sensors. Combining homochiral 1,1'-binaphthyl-2,2'-diyl hydrogen phosphate (BPA) with an AIE-based ligand tetrakis[4-(pyridin-4-yl)phenyl]ethene (TPyPE) in complexes - and - made them possess favorable circularly polarized luminescence (CPL) properties, and their CPL spectra were almost mirror images of each other. The luminescence dissymmetry factors () are ±2.

Simultaneous capture of hydrophilic and hydrophobic compounds from complex plants by biosurfactant-assisted mechanical amorphous dispersion extraction.

A biosurfactant-assisted mechanical amorphous dispersion extraction (BA-MADE) procedure was established for the simultaneous capture of hydrophilic phenolic acids and hydrophobic tanshinones from Salvia miltiorrhiza. Single-factor experiments and the response surface methodology were used to optimize and analyze the crucial parameters for the method, such as the type and amount of amorphous-dispersion extractants, grinding time, extraction time and solid-to-liquid ratio. The optimized parameter values for the BA-MADE process were 407.

A biological luminescent metal-organic framework with high fluorescence quantum yield for the selective detection of amino acids and monosaccharides.

The biological luminescent metal-organic framework (bio-LMOF), (MeNH)[ZnO(Ade)(TCPPE)] (1) {HTCPPE = tetrakis[4-(4-carboxyphenyl)phenyl]ethene, Ade = adenine} was successfully designed and synthesized under hydrothermal conditions, with two channels of different sizes. The absolute fluorescence quantum yields of complex 1 and activated 1 are up to 77.6% and 85.

Nitrogen-Rich Tetraphenylethene-Based Luminescent Metal-Organic Framework for Efficient Detection of Carcinogens.

The introduction of nitrogen-rich functional groups into a luminescent metal-organic framework (LMOF) can enhance its fluorescent sensing ability. In this work, we designed and synthesized a triazole-containing tetracarboxyl-substituted tetraphenylethene (TPE) ligand, tetrakis[4-(4-carboxyphenyl)(1-1,2,3-triazol-4,1-diyl)phenyl]ethene (HTCPTAPE), featuring a prominent aggregation-induced emission (AIE). A highly porous TPE-based LMOF [Zn(TCPTAPE)(HO)(OH)] () with large pores was successfully obtained via solvothermal assembly of the HTCPTAPE ligand and Zn(II) ions, which showed a high fluorescence quantum yield of 54%.

Tetraphenylethene-Based Luminescent Metal-Organic Framework for Effective Differentiation of Isomers.

Luminescent metal-organic frameworks (LMOFs) that can effectively differentiate / isomers are rarely reported. Herein, we report a novel non-interpenetrated pillared-layered LMOF [Zn(HIPA)(BPyTPE)] () (BPyTPE = ()-1,2-diphenyl-1,2-bis(4-(pyridin-4-yl)phenyl)ethene; HIPA = (5-hydroxyisophthalic acid)) with a high fluorescence quantum yield of 90.1%.

A highly luminescent entangled metal-organic framework based on pyridine-substituted tetraphenylethene for efficient pesticide detection.

A novel pillared-layered entangled luminescent metal-organic framework [Zn(bpdc)(BPyTPE)] (1) (BPyTPE = (E)-1,2-diphenyl-1,2-bis(4-(pyridin-4-yl)phenyl)ethene) has been designed and constructed. The solvent-free 1 exhibits strong blue-green emission with an excellent fluorescence quantum yield of 99% and provides a facile and reversible method to sensitively and quantitatively detect trace pesticide of 2,6-dichloro-4-nitroaniline.

Screening of thrombin inhibitors from phenolic acids using enzyme-immobilized magnetic beads through direct covalent binding by ultrahigh-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry.

Thrombin was immobilized on dynabeadsM-270 epoxy by direct covalent binding method for the first time. The enzyme coated magnetic beads were combined with ultrahigh-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry technique to establish a simple, rapid and reliable approach for screening thrombin inhibitors from Danshen preparation. The conjugation of thrombin to the magnetic beads was characterized using scanning electron microscope, transmission electron microscope and infrared spectroscopy, and the enzyme activity was determined by the analysis of enzyme-bead ratio and peak areas of target compounds.

Extraction and enrichment of natural pigments from solid samples using ionic liquids and chitosan nanoparticles.

A green and economical method for the extraction and preconcentration of natural pigments (curcumin, demethoxycurcumin and bisdemethoxycurcumin) was developed using ultrasound-assisted extraction combined with dispersive micro solid-phase extraction. In this work, Ionic liquids (ILs) were used for the pre-extraction of natural pigments. The pure chitosan nanoparticles (CS NPs) were then used as a sorbent for the microextraction mode.

Homochiral metal phosphonate nanotubes.

A new type of homochiral metal-organic nanotubular structures based on metal phosphonates are reported, namely, (R)- or (S)-[M(pemp)(H2O)2][M = Co(II) (1), Ni(II) (2)] [pemp(2-) = (R)- or (S)-(1-phenylethylamino)methylphosphonate]. In these compounds, the tube-walls are purely inorganic, composed of metal ions and O-P-O bridges. The cavity of the nanotube is hydrophilic with one coordination water pointing towards the center, while the outer periphery of the nanotube is hydrophobic, decorated by the phenylethyl groups of pemp(2-).

A luminescent metal-organic framework constructed using a tetraphenylethene-based ligand for sensing volatile organic compounds.

By using a tetraphenylethene (TPE)-based ligand, tetrakis[4-(4-carboxyphenyl)phenyl]ethene (H4TCPPE), a porous metal-organic framework [Zn2(TCPPE)] (1) is synthesized, which exhibits strong fluorescence and is capable of gas adsorption and sensing volatile organic compounds.

Bis[(1S,1'S)-1,1'-(4-amino-4H-1,2,4-triazole-3,5-di-yl)diethanol-κN]bis-(nitrato-κO)zinc.

In the title homochiral mononuclear compound, [Zn(NO(3))(2)(C(6)H(12)N(4)O(2))(2)], the Zn(II) atom is located on a twofold rotation axis and coordinated by two N atoms from two ligands and two O atoms from two NO(3) (-) anions, adopting a distorted tetra-hedral coordination geometry. The compound is enanti-omerically pure and corresponds to the S diastereoisomer, with the optical activity originating from the chiral ligand. In the crystal, mol-ecules are connected into three-dimensional supra-molecular networks through O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds.

Homochiral zinc phosphonates with layered and open framework structures using polycarboxylate as second linkers.

Reactions of zinc sulfate and (R)- or (S)-(1-phenylethylamino)methylphosphonic acid (pempH(2)) in the presence of 1,4-benzenedicarboxylic acid (H(2)bdc) result in homochiral enantiomers (R)- and (S)-[Zn(4)(pempH)(4)(bdc)(2)].2H(2)O (). When H(2)bdc is replaced by 1,2,4,5-benzenetetracarboxylic acid (H(4)btec), enantiomers (R)- and (S)-[Zn(3)(pempH)(2)(btec)(H(2)O)(2)].

Metal phosphonates based on (4-carboxypiperidyl)-N-methylenephosphonate: in situ ligand cleavage and metamagnetism in Co3(O3PCH2-NHC5H9-COO)2(O3PCH2-NC5H10)(H2O).

Hydrothermal reaction of (4-carboxypiperidyl)-N-methylenephosphonic acid (4-cpmpH3) and zinc sulfate results in compound Zn(O3PCH2-NHC5H9-COO) (). It has a pillared layered structure in which the inorganic layers made up of corner-sharing {CPO3} and {ZnO4} tetrahedra are connected by the organic groups. When cobalt sulfate is allowed to react with 4-cpmpH3 under similar conditions, a proportion of the ligands undergo decarboxylation, leading to the formation of a novel mixed ligated compound Co3(O3PCH2-NHC5H9-COO)2(O3PCH2-NC5H10)(H2O) ().

Homochiral lanthanide phosphonates with brick-wall-shaped layer structures showing chiroptical and catalytical properties.

Based on enantiopure S- or R-(1-phenylethylamino)methylphosphonic acid (pempH(2)), homochiral lanthanide phosphonates (S)-[Ln(pempH)(NO(3))(2)(H(2)O)(2)] (S-Ln) and (R)-[Ln(pempH)(NO(3))(2)(H(2)O)(2)] (R-Ln) (Ln = Eu, Tb, Ho) are obtained successfully. All six compounds are isostructural, showing chiral brick-wall-shaped layer structures. They are all optically active, exhibiting second harmonic generation responses 0.

Polymorphism in homochiral zinc phosphonates.

This paper reports four homochiral zinc phosphonates, alpha-(S)-[Zn 2(pemp)(pempH)Cl] (1), alpha-(R)-[Zn 2(pemp)(pempH)Cl] (2), beta-(S)-[Zn 2(pemp)(pempH)Cl] (3), and beta-(R)-[Zn 2(pemp)(pempH)Cl] (4) [pempH 2 = (1-phenylethyl)amino]methylphosphonic acid]. Both 1 and 2 are enantiomers, crystallizing in an orthorhombic P2(1)2(1)2(1) space group, while 3 and 4 are polymorphic phases of 1 and 2, respectively, crystallizing in a monoclinic P2(1) space group. The polymorphism is induced by temperature or additional organic molecules.

A novel three-dimensional cadmium(II) coordination polymer incorporating 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene and thiocyanate.

In the title complex, poly[cadmiumII-mu2-1,4-bis(1,2,4-triazol-1-ylmethyl)benzene-di-mu2-thiocyanato], [Cd(NCS)2(C12H12N6)]n, the CdII atom lies on an inversion centre in a distorted octahedral environment. Four N atoms from the thiocyanate and 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene (bbtz) ligands occupy the equatorial positions, and two S atoms from symmetry-related thiocyanate ligands occupy the axial positions. The benzene ring of the bbtz ligand lies about an inversion centre.

A novel two-dimensional network cadmium(II) coordination polymer containing one 1,4-bis(1,2,4-triazol-1-yl)butane and double dicyanamide bridges.

In the crystal structure of the title complex, poly[mu-1,4-bis(1,2,4-triazol-1-yl)butane-di-mu-1,5-dicyanamido-cadmium(II)], [Cd(C2N3)2(C8H12N6)]n or [Cd(dca)2(btb)]n, where dca is dicyanamide and btb is 1,4-bis(1,2,4-triazol-1-yl)butane, each Cd(II) atom occupies a center of symmetry and is in a six-coordinated distorted octahedral environment. Four N atoms from four dca ligands fill the equatorial positions, and two N atoms from two btb ligands occupy the axial positions. The dca ligands adopt an end-to-end coordination mode and link the Cd(II) atoms to form a 12-membered Cd(dca)2Cd ring, and neighboring rings extend along the b axis to form a [Cd(dca)2]n chain.

A novel three-dimensional copper(II) coordination polymer with 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene and thiocyanate.

In the title complex, poly[copper(II)-di-2-thiocyanato-2-1,4-bis(1,2,4-triazol-1-ylmethyl)benzene], [Cu(NCS)2(C12H12N6)]n, the CuII atom lies on an inversion centre in a tetragonally distorted octahedral environment. Four N atoms from thiocyanate and 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene (bbtz) ligands fill the equatorial positions, and S atoms from symmetry-related thiocyanate ligands fill the axial positions. The benzene ring of the bbtz ligand lies about an inversion centre.