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Nickel

About: Nickel is a research topic. Over the lifetime, 79308 publications have been published within this topic receiving 1210058 citations. The topic is also known as: Ni & element 28.


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Journal ArticleDOI
TL;DR: In this paper, the cores of copper and nickel octaazaphthalocyanines are fused to four nonracemic [7]helicenes, and a calculation based on molecular mechanics shows that the energy is minimized when the molecules stack in a chiral superstructure with a core-to-core distance of ca. 3.4 A.
Abstract: Molecules in which the cores of copper and nickel octaazaphthalocyanines are fused to four nonracemic [7]helicenes are constructed. CD and UV−vis absorption spectroscopy show that these compounds aggregate when dissolved in 75% EtOH−25% CHCl3, but not in 60% EtOH−40% CHCl3. The UV−vis absorption spectra of films of the nickel phthalocyanine are similar to those of solutions of the aggregated molecules, suggesting that the structures of the aggregates in the neat samples and in solution are similar. A calculation based on molecular mechanics shows that the energy is minimized when the molecules stack in a chiral superstructure with a core-to-core distance of ca. 3.4 A. Atomic Force Microscopic images are in accord with this structure if on the surface of mica the stacks are isolated and perpendicular to the surface. In Langmuir films, the molecules stack in the opposite way, with the stacking axis parallel to the water. Although the molecules are remarkably symmetrical, their Langmuir−Blodgett films give v...

173 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that cobalt and nickel phthalocyanines are active catalysts for the electrode reduction of carbon dioxide, and that they can be used as catalysts in a variety of applications.
Abstract: It is shown that cobalt and nickel phthalocyanines are active catalysts for the electrode reduction of carbon dioxide.

173 citations

Book ChapterDOI
TL;DR: Nickel deficiency produces an array of effects on growth and metabolism of plants, including reduced growth, and induction of senescence, leaf and meristem chlorosis, alterations in N metabolism, and reduced Fe uptake.
Abstract: Nickel is one of 23 metal pollutants of great concern to the environment and to human health (Sunderman 1992; Jarup 2003; Duda-Chodak and Baszczyk 2008). Nickel is the 24th most abundant element (twice as Cu) and comprises approximately 0.008% of the content of the earth’s crust; hence, it is a natural component of soil (parent material) and water (Alloway 1995; Hostýnek and Maibach 2002; Hedfi et al. 2007). Most of the earth’s nickel, however, is inaccessible, as it is locked in the iron–nickel molten core, which constitutes approximately 10% nickel. The second largest Ni deposits of the earth rest in the sea. It is estimated that the sea contains approximately eight billion tons of Ni, either dissolved in seawater or deposited in the seabed (Birch 1964; Stixrude et al. 1997). Soils may contain nickel levels as low as 0.2 mg kg−1 or as high as 450 mg kg−1. The average nickel content in soil is approximately 20 mg kg−1; however, the content level may vary greatly depending upon the mode of origin of the soil’s parent material (Assembly of Life Sciences 1975; Aubert and Pinta 1978; Wilson and Kordybach 2000). Because organic matter strongly absorbs some metals, particularly nickel, fossil fuels such as coal and oil may contain considerable amounts of nickel (Sigel et al. 2005). Moreover, Ni naturally occurs in a few plants (legumes) where it functions as an essential component of some enzymes (e.g., ureases) that are involved in nitrogen assimilation (Eskew et al. 1984; Brown et al. 1987a; Sakamoto and Bryant 2001).

173 citations

Journal ArticleDOI
TL;DR: For the first time, noble-metal-free nickel phosphide (Ni2P) was used as an excellent catalyst precursor for water oxidation catalysis and its lowest onset potential was observed at ∼1.54 V.

173 citations

Journal ArticleDOI
TL;DR: For the removal of uranium(VI) (U(VI)) and thorium(IV) (Th(IV), graphene oxide based inverse spinel nickel ferrite (GONF) nanocomposite and reduced graphene oxidebased inversespinel nickelferrite (rGONf) nanography were prepared by co-precipitation of GO with nickel and iron salts in one pot.

173 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20233,184
20226,229
20211,949
20202,693
20193,234
20183,107