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Thiocyanate [6] is known to be an important part in the biosynthesis of hypothiocyanite by a lactoperoxidase. [7] [8] [9] Thus the complete absence of thiocyanate or reduced thiocyanate [10] in the human body, (e.g., cystic fibrosis) is damaging to the human host defense system.
Lewis structure of a water molecule. Lewis structures – also called Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs) – are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
The esters of thiocyanic acid have the general structure R−S−C≡N, where R stands for an organyl group. Isothiocyanic acid, HNCS, is a Lewis acid whose free energy, enthalpy and entropy changes for its 1:1 association with a variety of Lewis bases in carbon tetrachloride solution at 25 °C have been reported.
Transition metal complexes of thiocyanate describes coordination complexes containing one or more thiocyanate (SCN-) ligands. The topic also includes transition metal complexes of isothiocyanate . These complexes have few applications but played significant role in the development of coordination chemistry.
3(SCN) 2 + 4H 2 O → H 2 SO 4 + HCN + 5HSCN. Thiocyanogen is a weak electrophile, attacking only highly activated (phenolic or anilinic) or polycyclic arenes. [1]: 243–245 It attacks carbonyls at the α position. [1] Heteratoms are attacked more easily, and the compound thiocyanates sulfur, nitrogen, and various poor metals.
[2]: 8 It is the first member of the dicyanosulfanes S x (CN) 2, which includes thiocyanogen ((SCN) 2) and higher polysulfanes up to S 4 (CN) 2. [3] According to X-ray crystallography, the molecule is planar, the SCN units are linear, with an S-C-S angle of 95.6°. [4] Sulfur dicyanide begins to sublime at 30-40 °C and melts at 60 °C. [5]
The halides are Lewis acids; for example, ScF 3 dissolves in a solution containing excess fluoride ion to form [ScF 6] 3−. The coordination number 6 is typical for Sc(III). In the larger Y 3+ and La 3+ ions, coordination numbers of 8 and 9 are common. Scandium triflate is sometimes used as a Lewis acid catalyst in organic chemistry.
Sodium thiocyanate (sometimes called sodium sulphocyanide) is the chemical compound with the formula NaSCN. This colorless deliquescent salt is one of the main sources of the thiocyanate anion.