Novel pyridine-based covalent organic framework containing N,N,N-chelating sites for selective detection and effective removal of nickel
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A novel pyridine-based COF material with functional N,N,N chelating sites has been designed and synthesized, which has the dual functions of fluorescence detection and efficient removal of Ni 2+ from aqueous solution.The infrared spectra of pyridine and pyridine-4-d in the vapor state and of pyridine-2,6-d 2 and pyridine-3,5-d 2 in the liquid and vapor states have been obtained. The Raman spectra of pyridine-4-d, pyridine-2,6-d 2 , and pyridine-3,5-d 2 as liquids have also been obtained together with depolarization ratios. The vapor band contours for pyridine support the assignment of Corrsin, Fax, and Lord in most part in preference to the assignment of McCullough and co-workers but it was found necessary to reassign the b 2 frequencies to give agreement between calculated and observed thermodynamic functions. The infrared and Raman data on pyridine-4-d are in agreement with the reported assignment for the a 1 , a 2 , and b 1 modes but it was found necessary to reassign the b 2 frequencies consistent with the present assignment in pyridine. A complete vibrational assignment for pyridine-2,6-d 2 and pyridine-3,5-d 2 has been made consistent with the present assignment in pyridine.
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Abstract The infrared spectrum of matrix isolated pyridine and pyridine‐d 5 is studied in noble gas matrices. A number of vibration band splittings is observed, most of which have not yet been reported in literature. The splittings are found to be caused by two types of association, a pyridine‐pyridine one and a pyridine‐H 2 O complex. Information concerning the structure of the associated systems is obtained from a careful analysis of the experimental results.
Matrix Isolation
Matrix (chemical analysis)
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Novel high efficient fluorescent chelate for Eu based on diethylenethriaminepentaacetic acid and amino (beta) -diketones is proposed for time-resolved fluorescence immunoassay. The label surpasses all known chelates for europium in major spectral and luminescent characteristics. The proposed label has number of advantages over the well-known europium chelates. The assays with new fluorescent chelate do not require enhancement solution, but the sensitivity of Eu determination is the same as for DELFIA enhancement solution. The assay with new fluorescent chelate is insensitive to contamination of solutions and samples with ions of heavy metals, because the concentration of fluorescent chelate is measured and high excess of Eu prevents dissociation of fluorescent chelate complex. Techniques have been developed for covalent labeling of proteins with the new fluorescent chelate. The labelling proteins can be stored in the lyophilized state or in stabilized solution rather long and retain their immunological properties. Application of the new fluorescent chelate enables the washing step to be avoided and to develop the express non-separation assay.
Europium
Conjugate
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A study was carried out to compare the rates of absorption of nickel from two nickel complexes and two nickel salts in the West African Dwarf (WAD) goat. Treatments consisted of oral administration of 5mg equivalents of elemental nickel from nickel sulphate hexahydrate (NiSO4.6H2O); nickel chloride hexahydrate (NiCl2.6H2O); nickel sodium monofluorophosphate (Ni-SMFP) complex and nickel-chloroquine (Ni-Clrq) complex. Changes in the plasma levels of nickel were monitored until the concentration declined. Nickel absorption into the blood was in the order: Ni-SMFP>NiClrq>NiSO4.6H2O>NiCl2.6H2O indicating that nickel is more readily available to goats in the complex forms. JARD Vol. 1 2001: pp. 23-30
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Abstract The method for preparing 2‐bromo‐pyridine in high yield from 2‐amino‐pyridine is known as Craig 2‐bromo‐pyridine synthesis. The concentrated aqueous solution of sodium nitrite and 2‐amino‐pyridine have been added to a concentrated hydrobromic acid saturated with bromine to obtain optimum yield of 2‐bromo‐pyridine. This reaction has application for the preparation of 2‐bromo‐pyridine and 2‐bromopyrimidine.
Hydrobromic acid
Sodium nitrite
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A characterization study was undertaken with eighteen kinds of nickel/alumina impregnated catalysts prepared by using three nickel compounds (nickel (II) acetylacetonate, nickel (II) acetate and nickel (II) chloride) as the nickel source material and by applying two impregnation methods (single and multiple). The catalysts prepared by using nickel (II) acetylacetonate and nickel (II) acetate showed a similar distribution and average of nickel particle diameters regardless of nickel source material or impregnation method. The distribution broadening and the average increased with increasing nickel content for the catalysts prepared by using nickel (II) chloride. The rate of benzene hydrogenation was proportional to the nickel surface area regardless of nickel source material or impregnation method.
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Abstract Reduction of anhydrous nickel(II) compounds in the presence of diazadienes RN=CR'-CR' = NR, |(DAD), yields (DAD) 2 Ni(0). This complex 1 with R = CH(i-C 3 H 7 ) 2 is especially reactive and comproportionates with DADNiBr 2 (2) to yield the bromobridged dimeric nickel(I) species (DADNiBr) 2 (3). The crystal and molecular structure of 3 has been determined by single crystal X-ray diffraction: Space group Pbca with a = 1225.8(12), b = 1474.8(14) and c = 2167.4(22) pm; Ra = 0.076, 1034 reflections. Catalytic tetramerisation of substituted alkynes with 1 is discussed in view of the very easy formation of dimers 3.
Anhydrous
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Abstract When pyridine is heated with 100% sulphuric acid in the presence of mercuric sulphate as a catalyst at about 275°, pyridine‐3‐sulphonic acid is formed as the chief product, together with very small amounts of byproducts. The course of the reaction is more complicated at somewhat higher reaction temperatures. At 330° a mixture is obtained which contains, together with pyridine‐3‐sulphonic acid and the 4‐isomer, 4‐hydroxypyridine in considerable amount. The sulphonation of pyridine is a reversible process. When pyridine‐3‐sulphonic acid is heated with 100% sulphuric acid and mercuric sulphate at ∼ 330°, a mixture is formed containing chiefly pyridine, together with pyridine‐4‐sulphonic acid, 4‐hydroxypyridine and the starting substance.
Reactivity
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