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Zinc is a chemical element with the symbol Zn and atomic number 30. It is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodic table .
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.
A dramatic example is the conversion of methanol into hexamethylbenzene using zinc chloride as the solvent and catalyst: [48] 15 CH 3 OH → C 6 (CH 3) 6 + 3 CH 4 + 15 H 2 O. This kind of reactivity has been investigated for the valorization of C1 precursors. [49] Examples of zinc chloride as a Lewis acid include the Fischer indole synthesis: [50]
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.
Zinc acetylacetonate is an acetylacetonate complex of zinc, with the chemical formula of Zn(C 5 H 7 O 2) 2. The compound is in fact a trimer, Zn 3 (acac) 6, in which each Zn ion is coordinated by five oxygen atoms in a distorted trigonal bipyramidal structure. [5]
Gold has atoms with one less 6s electron than mercury. Those electrons are more easily removed and are shared between the gold atoms forming relatively strong metallic bonds. [18] [19] Zinc, cadmium and mercury form a large range of alloys. Among the zinc containing ones, brass is an alloy of zinc and copper.
The separation between each Zn atom and the center of the cyclopentadienyl ring attached to it is approximately 2.04 Å and the Zn-C(ring) distances range from 2.27 to 2.30 Å. [3] The Zn-Zn bond distance is 2.305 Å, which indicates considerably strong bonding between the two zinc atoms.