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Coordinate bonds are bonds formed between objects or features with coordinates. Coordinates are specified by a set of numbers that indicate the location of an object or feature in a 2D or 3D space. The coordinates of an object or feature can be thought of as its position or location on a coordinate plane or grid. The position or location of one object or feature on the coordinate plane or grid can be represented by a pair of coordinates.
They are an integral part of chemistry and the key to understanding the structure of matter, as well as its interactions with light, and many other aspects of the chemical world.
Coordinate bond
The most common coordinate bond in organic chemistry is a single bond between a carbon atom and a nonmetal atom, such as a hydrogen atom.
The bonds in an atom are called coordinate bonds (or covalent bonds), because they are formed by a single pair of electrons. This type of bond is a directional bond, where the electrons that form the bond are located on two different atomic nuclei.
An example of a coordinate bond is the relationship between a hydrogen ion and an electron pair between hydrogen and the ammonia molecule when the ammonium ion is formed by the transfer of a proton ion to the pair of electrons in the ammonium molecule.
Bonded coordinates or dative bonds are defined as σ-bonding interaction between the electronegative atom, (σ is the Pauli exclusion principle) and the π-electron system of an aromatic ring. Dative bonds are present in compound molecules like acetylene and sulphur dioxide.
Some properties of coordinate bond or dative bond
They have lower boiling and melting points than ionic compounds.
When electrons share, they do so in a definite direction, and thus, they are directional bonds.
Coordinate bonding is weaker than ionic bonding.
Some of these compounds can be described as having isomerism.
Coordinate bond diagram examples
Ammonium ion: In ammonia, the nitrogen atom gives its electron pair to the empty orbital of the H+, thus nitrogen is the donor and H+ is the acceptor. A coordinate bond is formed between A and B.
Hydronium ion: Hydronium ion is a chemical compound with the molecular formula H3O+. It is a colourless gas at room temperature, but is often encountered as the salt (an acid [H+] cation) hydroxide, OH-, also known as hydroxide anion, -OH. Hydronium ion is the ionic form of hydrogen, which is the most common form of the element on Earth. When a chemical loses its water, it becomes a hydronium ion.
Ammonia Boron Trifluoride: Ammonia boron trifluoride is a colourless to white gas at room temperature and pressure. It is one of the most reactive non-fluorine compounds known, and is corrosive to most materials. It is a potent greenhouse gas, and is also an extremely powerful oxidizer and explosive. Ammonia boron trifluoride is used primarily as a cleaning and degreasing agent and in the manufacture of other chemicals.
Conclusion
Coordinate bonds are present in chemical reactions such as those found in the formation of acids, bases, and salts. These bonds are formed when a metal atom has a formal charge in a tetrahedral coordination surrounding it. The metal atom is at the centre of coordination. The metals are usually the same metals as their neighbours in other chemical bonds, but this is not always the case.
