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A novel iodocuprate, [Co(phen) 2 (μ-Cl)] 2 [Cu 9 I 11 H 2 O] n (phen = 1,10-phenanthroline ), composed of a two-dimensional (2D) corrugated anionic layer [Cu 9 I 11 H 2 O] n 2? and a three-dimensional (3D) cationic supramolecular network, has been solvothermally obtained. The anionic layer [Cu 9 I 11 H 2 O] n 2? in the bc plane can be considered as being built up by two types of secondary building units (SBUs) Cu 4 I 9 and Cu 10 I 14 (H 2 O) 2 . The dimeric [Co(phen) 2 (μ-Cl)] 2 2+ interacts with each other via offset face-to-face (OFF) interactions giving rise to a 3D cationic supramolecular network with cristobalite topology, which appears to have a complementary relationship with inorganic anionic layers.

A H-shaped heterometallic Sn 4 Au 4 system that displays tuneable guest-dependent optical and photoluminescent properties has been synthesized. It shows selective dye sorption, while its stimuli-responsive methylred-rich solid is sensitive towards pH variations. This non-emissive Sn 4 Au 4 system exhibits multicolour luminescence in the presence of aniline derivatives.

Heavy metal ions are common pollutants in water pollution. Amino acids, as important substances in organisms, participate in many life activities. The detection of heavy metal ions and amino acids with high selectivity and sensitivity is important. Therefore, based on H 3 L ( H 3 L = 4,4′,4′′-triazine-2,4,6-tribenzoic acid) and Eu 3+ , an Eu-MOF was designed, synthesized and characterized. Single crystal structure analysis showed that the Eu-MOF was crystallized in the orthorhombic space group Fddd , and presents a three-dimensional (3D) porous network structure. The luminescence results show that the Eu-MOF has good luminescence stability. As a multifunctional luminescent sensor, the Eu-MOF can detect Fe 3+ , Cr 2 O 7 2? , CrO 4 2? and aspartic acid (Asp) in water systems with high sensitivity and selectivity, and the lowest detection limit (LOD) was 1.12 × 10 ?6 mol L ?1 , 1.95 × 10 ?6 mol L ?1 , 1.89 × 10 ?6 mol L ?1 and 2.20 × 10 ?6 mol L ?1 , respectively. These results indicated that the Eu-MOF has potential application prospects in the detection of Fe 3+ , Cr 2 O 7 2? , CrO 4 2? and Asp in water.

A porous 3D framework based on [Co 2 (μ 2 -OH 2 )] clusters and mononuclear Co centers, is presented. The [Co 2 (μ 2 -OH 2 )] units act as 7-connected and 8-connected nodes, respectively. The desolvated form of 1 shows high CO 2 and H 2 adsorption.

The crystal structure and crystal packing of {[Fe(phen) 3 ] 2+ } 3 {[ClHgI 3 ] 2? } 2 [HgI 3 ] ? Cl ? , 1 , are described. The [Fe(phen) 3 ] 2+ cations have selected three different anions from those in equilibrium in the crystallisation solution. The lattice has high symmetry ( P 1 c ), making repeated use of supramolecular motifs based on C–H?Cl ? /I ? interactions on the edges of phen ligands , and of I ? ?phen face interactions. The efficiency of the crystal packing is evident from (a) the involvement of all molecular surfaces in significant motifs, (b) the repetition of favourable motifs, (c) the absence of solvent , and (d) the absence of disorder. Despite this, the conditions for reproducible crystallisation of this compound have not been secured, despite many attempts, and evidently the lattice stability of 1 is challenged by alternative associations of [Fe(phen) 3 ] 2+ with anions from the equilibrium mixture.

Previously, organic-ionic crystal phase transition materials have mainly focused on mono- or divalent organic amine cations, while higher valent amine cations have rarely been introduced. Here, we have selected a ring-shaped trivalent organic amine, triethylenetriamine, in order to construct a high- T c phase transition material, triethylenetriammonium trichloride ([HTETA] 3+ 3[Cl] ? ).

Anion complexation of a flexible bis(pyridylcarbamate) receptor , 3-pyridinyl-carbamic-acid-1,2-ethanediylester (L), is reported. Upon addition of a series of inorganic acids (H 3 PO 4 , H 2 SO 4 , HClO 4 , HCl and HBr ), the ligand L can be doubly protonated and bind the anions through hydrogen bonding interactions, affording the adducts 1–5 . The binding modes of the protonated ligand ([LH 2 ] 2+ ) with anions in 1–5 in the solid state are established by X-ray single crystal diffraction. Of particular interest is that the three oxoanion complexes ( 1–3 ) feature intriguing anionic polymer fashions, such as the novel double-stranded dihydrogen phosphate chain in 1 , the infinite [-sulfate-(H 2 O) 2 -] n chain in 2 , and hydrogen -bridged helical perchlorate chain in 3 . For complexes 4 and 5 , the packing diagram displays a layered structure with the halide anions located between the adjacent cationic arrays. Receptor L can selectively crystallize with the sulfate anion from the acid mixture H 3 PO 4 , H 2 SO 4 , HClO 4 , HCl and HBr .

Herein, we report a facile approach for preparing Fe 3 O 4 @SiO 2 @C/Ni microtubes, which could be used as both a catalyst and adsorbent. During the synthetic process, two coating layers (SiO 2 and PDA-Ni 2+ layers) are polymerized on the surface of MoO 3 @FeOOH in turn with an extended St?ber method using MoO 3 microrods as sacrificing templates. Notably, the coating of inorganic SiO 2 and organic PDA-Ni 2+ layers and the removal of MoO 3 cores are easily achieved simultaneously in ammonia solution with a one-step reaction. Interestingly, the coated silica not only protects the Fe 3 O 4 nanoparticles, but also suppresses the reverse electron transfer from PDA to Fe 3 O 4 in a calcination process, which leads to the in situ reduction of Ni 2+ that enhances the dispersibility and density of the Ni nanoparticles. The resulting Fe 3 O 4 @SiO 2 @C/Ni hybrid microtubes can be used as a catalyst towards the reduction of 4-nitrophenol (4-NP) in the presence of NaBH 4 . Meanwhile, they also exhibit highly selective adsorption on His-rich proteins (BHb). Moreover, the hybrid microtubes can be conveniently separated with an extra magnetic field due to the presence of Ni and Fe 3 O 4 , and they show good cyclic stability, which is important for practical applications.

In this study, for the first time, a GeSe micro air brick (MAB) crystal-based film was applied to the photodegradation of rhodamine B (RhB) dye in polluted water under visible light irradiation. Moreover, the RhB photodegradation performance of the GeSe MAB crystal-based film was systematically studied. In contrast to the GeSe powder, the GeSe MAB crystal-based film exhibited a superior RhB photodegradation efficiency due to the lower light reflection efficiency of the MAB crystal film structure. The best RhB photodegradation efficiency of 93.7% was achieved under 2 h of solar light irradiation, attributed to the synergistic effects of the surface morphology of GeSe MAB crystals.

Strong halogen bonds can provide a foundation for reliable supramolecular strategies for effective self-assembly and design of functional materials . A new class of halogen-bond donors have been developed using structural and theoretical tools and these 3-iodo-1-phenylprop-2-yn-1-ones demonstrate several features that make them promising additions to the crystal engineering tool-box .