What is a cobalt complex?
Cobalt complexes derived from alkynic epoxides undergo a Lewis acid catalysed 6-endo cyclization in which the configuration of the substrate is retained in the tetrahydropyran (Scheme 62) 〈94TL2179〉. From: Comprehensive Heterocyclic Chemistry II, 1996.
What are 4 coordinate complexes?
Tetrahedral and square planar complexes have a coordination number of four; trigonal bipyramidal and square pyramidal complexes have a coordination number of five; and octahedral complexes have a coordination number of six.
What is ammonia complex?
In coordination chemistry, metal ammine complexes are metal complexes containing at least one ammonia (NH3) ligand. Almost all metal ions bind ammonia as a ligand, but the most prevalent examples of ammine complexes are for Cr(III), Co(III), Ni(II), Cu(II) as well as several platinum group metals.
What compounds does cobalt form?
Co3+ forms more known complex ions than any other metal except platinum. The coordination number of the complexes is generally six. Cobalt forms two well-defined binary compounds with oxygen: cobaltous oxide, CoO, and tricobalt textroxide, or cobalto-cobaltic oxide, Co3O4.
Does cobalt form complex compound?
One of the chloride ions is bound to the cobalt in the [Co(NH3)5Cl]Cl2 complex. Only three ions are formed when this compound dissolves in water, and only two Cl- ions are free to precipitate with Ag+ ions….Bonding.
| Metal Ion | Co3+ |
|---|---|
| + | |
| Ligand | 6 NH3 |
| Complex | Co(NH3)63+ |
| Coordination Number | 6 |
Is cobalt a hydroxide?
) is a pink solid insoluble in water….Cobalt(II) hydroxide.
| Names | |
|---|---|
| Appearance | rose-red powder or bluish-green powder |
| Density | 3.597 g/cm3 |
| Melting point | 168 °C (334 °F; 441 K) (decomposes) |
| Solubility in water | 3.20 mg/L |
What do you mean by complex compound?
-A complex compound can be described as a class of substances with a chemical structure where the central atom is a metal and it is surrounded by non-metal atoms or a group of atoms (or ligands). Both the central atom and ligands are joined by chemical bonds like covalent bond, ionic bond, coordinate bond.
What are complexes in chemistry?
complex, in chemistry, a substance, either an ion or an electrically neutral molecule, formed by the union of simpler substances (as compounds or ions) and held together by forces that are chemical (i.e., dependent on specific properties of particular atomic structures) rather than physical.
What is complex compound in chemistry?
-A complex compound can be described as a class of substances with a chemical structure where the central atom is a metal and it is surrounded by non-metal atoms or a group of atoms (or ligands). – Complex compound is also called a coordinate compound as it contains the coordinate bonds in its structure.
How complex compounds are formed?
A complex ion is a species formed between a central metal ion and one or more surrounding ligands, molecules or ions that contain at least one lone pair of electrons. Small, highly charged metal ions have the greatest tendency to act as Lewis acids and form complex ions.
What is cobalt?
Sources of Cobalt It is found in green and blue watercolors and crayons as well. Cobalt is very often present in metal-plated buckles and buttons because it is used as an oxidizing agent in electroplating. It is used in metal alloys, such as that used to make drills, other cutting tools, and machine parts.
What is cobalt hydroxide used for?
Cobalt(II) hydroxide is most used as a drying agent for paints, varnishes, and inks, in the preparation of other cobalt compounds, as a catalyst and in the manufacture of battery electrodes.
Which is a stable complex of cobalt III?
The Cobalt (III) ion forms many stable complexes, which being inert, are capable of exhibiting various types of isomerism. The preparation and characterisation of many of these complexes dates back to the pioneering work of Werner and his students. Another important complex in the history of coordination chemistry is hexol.
What happens when Cobalt is added to pyridine?
Cobalt(II) halide complexes with pyridine show structural isomerism. Addition of pyridine to cobalt(II) chloride in ethanol can produce blue, purple or pink complexes each having the composition “CoCl 2pyr 2”. The structures are 4, 5 and 6 coordinate with either no bridging chlorides or mono- or di- bridged chlorides.
Where are the ligands located in a cobalt complex?
Werner assumed that transition-metal complexes had definite shapes. According to his theory, the ligands in six-coordinate cobalt (III) complexes are oriented toward the corners of an octahedron, as shown in the figure below. Any ion or molecule with a pair of nonbonding electrons can be a ligand.
What kind of isomerism does cobalt III have?
The Cobalt(III) ion forms many stable complexes, which being inert, are capable of exhibiting various types of isomerism. The preparation and characterisation of many of these complexes dates back to the pioneering work of Werner and his students.