Studies of anhydrous metal nitrates. I. Spectroscopic identification of different phases in copper(II) nitrate

James, David W.; Kimber, Graham M.

doi:10.1016/0020-1650(69)80151-0

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…The absorption peak of TPPE at 1592 cm −1 , which is assigned to a ν(C-C)-ν(C-N) composite vibration, shifted to 1595 cm −1 as a result of Hg 2+ coordination. In addition, the main difference was the strong absorption around 1300 cm −1 , which was attributed to the asymmetric stretching vibrations of the NO 3 − anion 38 .…”

Section: Ft-irmentioning

confidence: 99%

Hg(II) immobilization and detection using gel formation with tetra-(4-pyridylphenyl)ethylene and an aggregation-induced luminescence effect

Wei

Cui

et al. 2023

Sci Rep

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Tetra-(4-pyridylphenyl)ethylene (TPPE), featuring an aggregation-induced luminescence effect (AIE), has been synthesized and used for selective detection of Hg2+ in DMF/H2O (3:7, v/v) binary solutions. There was a color change from colorless to yellow in the detection of the Hg2+ ions, in addition to an increased fluorescence emission. This shows that TPPE will function as an excellent “turn-on” fluorescence probe in the detection Hg2+. Moreover, the interference of Al3+, Ba2+, Mn2+, Ca2+, Fe3+, Cu2+, Ag+, Cd2+, Co2+, Ni2+, Mg2+, Pb2+, Zn2+, and Cr3+ ions was found to be negligible under optimized solvent conditions. Cysteine and EDTA were also found to form TPPE-based fluorescent switches with the Hg2+ ions. The practical use of the TPPE sensor was also demonstrated by using a specific test kit. Characterization using FT-IR, NMR titration, UV titration, EDS, and HR-MS techniques showed that Hg2+ will form a 1:1 complex with TPPE. Also, the observation of a Tyndall effect, in addition to UV absorption and fluorescence spectra, did clearly demonstrate the presence of an AIE. More noteworthy, TPPE and Hg2+ were found to form a metal–organic gel (MOG) in the DMF solution. The SEM, TEM, ICP, and Zeta potential analyses confirmed that the fluorescent MOG could further adsorb an excess of Hg2+ ions. The BET analyses revealed that the MOG showed a type IV-H3 hysteresis loop according to the International Union of Pure and Applied Chemistry classification. The results of the XRD analysis and of the spectroscopic titrations show that a π–π stacking may be the auxiliary driving force for the gel formation, after that a coordination has taken place. These results indicate that further research on structurally simple metal ion fluorescent probes, which are based on the AIE, is promising for the achievement of a simultaneous fluorescent detection and adsorption of heavy metal pollutants.

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Section: Ft-irmentioning

confidence: 99%

Hg(II) immobilization and detection using gel formation with tetra-(4-pyridylphenyl)ethylene and an aggregation-induced luminescence effect

Wei

Cui

et al. 2023

Sci Rep

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Copper Nitrate Redispersion To Arrive at Highly Active Silica-Supported Copper Catalysts

Munnik

Wolters

Gabrielsson³

et al. 2011

J. Phys. Chem. C

119

125

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In order to obtain copper catalysts with high dispersions at high copper loadings, the gas flow rate and gas composition was varied during calcination of silica gel impregnated with copper nitrate to a loading of 18 wt % of copper. Analysis by X-ray diffraction (XRD), N2O chemisorption, and transmission electron microscopy (TEM) showed that calcination in stagnant air resulted in very large copper crystallites and a low copper surface area (12 m2·gCu –1). A moderate flow of air was sufficient to greatly enhance the copper surface area (∼90 m2·gCu –1) based on a bimodal particle size distribution of few large crystallites and a highly dispersed phase. Changing to an N2 flow resulted in similar copper surface areas compared to samples calcined in air at the same space velocity, while calcination in a 2% NO/N2 flow resulted in a relatively narrow particle size distribution peaking around 8 nm and a slightly lower copper surface area (84 m2·gCu –1). By use of SBA-15 supported samples, in situ XRD and diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) showed that the decomposition of copper nitrate in NO occurred via a highly dispersed copper hydroxynitrate phase, while decomposition in N2 or air occurred partly via copper nitrate anhydrate and partly via poorly dispersed copper hydroxynitrate. The high CuO dispersions after calcination in an N2 or air flow were ascribed to the redispersion of copper nitrate anhydrate by interaction with the OH groups of the silica support. By utilization of this redispersion, high copper dispersions on silica gel with concomitant high activities were obtained for the gas-phase hydrogenation of butanal.

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Studies of anhydrous metal nitrates. I. Spectroscopic identification of different phases in copper(II) nitrate

Cited by 2 publications

References 2 publications

Hg(II) immobilization and detection using gel formation with tetra-(4-pyridylphenyl)ethylene and an aggregation-induced luminescence effect

Hg(II) immobilization and detection using gel formation with tetra-(4-pyridylphenyl)ethylene and an aggregation-induced luminescence effect

Copper Nitrate Redispersion To Arrive at Highly Active Silica-Supported Copper Catalysts

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