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Zn, the most abundant isotope of zinc, is very susceptible to neutron activation, being transmuted into the highly radioactive 65 Zn, which has a half-life of 244 days and produces intense gamma radiation. Because of this, zinc oxide used in nuclear reactors as an anti-corrosion agent is depleted of 64 Zn before use, this is called depleted ...
For example, terpyridine, which is a tridentate ligand forms the complex [Zn(terpy)Cl 2]. Another example would involve a tripodal ligand such as Tris(2-aminoethyl)amine. Square pyramidal 5-coordinate Zinc is found in Tetra(4-pyridyl)porphinatomonopyridinezinc(II) [ 19 ] Solution studies of other 5-coordinate Zinc porphyrins have been reported.
Zinc fingers help read DNA sequences.. Zinc is an essential trace element for humans [1] [2] [3] and other animals, [4] for plants [5] and for microorganisms. [6] Zinc is required for the function of over 300 enzymes and 1000 transcription factors, [3] and is stored and transferred in metallothioneins.
Naturally occurring zinc (30 Zn) is composed of the 5 stable isotopes 64 Zn, 66 Zn, 67 Zn, 68 Zn, and 70 Zn with 64 Zn being the most abundant (48.6% natural abundance).Twenty-eight radioisotopes have been characterised with the most stable being 65 Zn with a half-life of 244.26 days, and then 72 Zn with a half-life of 46.5 hours.
This dualism is an example of polymorphism. In each form, the coordination geometry at Zn and S is tetrahedral. The more stable cubic form is known also as zinc blende or sphalerite. The hexagonal form is known as the mineral wurtzite, although it also can be produced synthetically. [2]
Caulton's reagent", V 2 Cl 3 6] [Zn 2 Cl 6], which is used in organic chemistry, is an example of a salt containing [Zn 2 Cl 6] 2−. [26] [27] The compound Cs 3 ZnCl 5 contains tetrahedral [ZnCl 4] 2− and Cl − anions, [9] so, the compound is not caesium pentachlorozincate, but caesium tetrachlorozincate chloride.
Typical Zn salts are ZnSO 4, Zn(OTf) 2, and Zn(TFSI) 2. [13] Zinc sulfate is widely used today because of its lower cost and electrode stability, but the larger triflate and TFSI anions can lead to higher conductivities. Despite the advantages of aqueous electrolytes, the hydrogen evolution reaction and facile dendrite growth limit their use.
The use of zinc sulfate supplements together with oral rehydration therapy decreases the number of bowel movements and the time until the diarrhea stops. [2] Its use in this situation is recommended by the World Health Organization. [2] There is some evidence zinc is effective in reducing hepatic and neurological symptoms of Wilson's disease. [8]