Coordination Compound vs complex ion

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Coordination Compound vs complex ion

Postby Rose_Malki_3G » Sat Dec 05, 2020 1:55 pm

What is the difference between a coordination compound and a complex ion? Is a complex ion just a coordination compound with a nonzero net charge.

idella 1D
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Re: Coordination Compound vs complex ion

Postby idella 1D » Sat Dec 05, 2020 2:11 pm

A complex is a species containing a metal atom in its center or an ion, to which a number of molecules, or ions, is attached by coordinate covalent bonds. More specifically, a complex ion has a metal ion at its center (basically what I said in the previous sentence). A coordination complex is a complex ion when it carries a net charge.
Some examples of complex ions are:
hexaaquarion(III) ion [Fe(OH2)6]3+
hexacyanoferrate(III) ion [Fe(CN)6]3-

A coordination compound is an electronically neutral compound in which at least one of the ions present is a complex. Compounds that CONTAIN a complex are called a coordination compound. That means a complex ion could be part of the coordination compound.
Some examples of a coordination compound are:
Ni(CO)4 or K4[Fe(CN)6]

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Re: Coordination Compound vs complex ion

Postby Grace_Remphrey_2J » Sun Dec 06, 2020 11:55 am

A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds. Compounds that contain a coordination complex are called coordination compounds. Coordination compounds and complexes are distinct chemical species - their properties and behavior are different from the metal atom/ion and ligands from which they are composed.

Here's some other helpful information regarding coordination compounds:
Ligands are Lewis bases: they contain at least one pair of electrons to donate to a metal atom/ion. Ligands are also called complexing agents. Metal atoms/ions are Lewis acids: they can accept pairs of electrons from Lewis bases.
Within a ligand, the atom that is directly bonded to the metal atom/ion is called the donor atom. A coordinate covalent bond is a covalent bond in which one atom (i.e., the donor atom) supplies both electrons. This type of bonding is different from a normal covalent bond in which each atom supplies one electron. If the coordination complex carries a net charge, the complex is called a complex ion.

Hope this helps!

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Re: Coordination Compound vs complex ion

Postby rita_debbaneh2G » Sun Dec 06, 2020 9:57 pm

A coordination compound is a compound with one or multiple metal centers that bind to ligands. Complex ions have metal ions at their centers and are surrounded by other molecules or ions. Coordination compounds differ from complex ions because of their lack of charge. Coordination compounds have no net charge while complex ions do.

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Re: Coordination Compound vs complex ion

Postby SashaAnand2J » Sun Dec 06, 2020 10:25 pm

Hi Rose!
Complex ions are charged molecules with a central metal atom. These central atoms are attached to ligands with coordinate covalent bonds (bonds in which both electrons come from the same donor atom). On the other hand, coordination compounds are neutral molecules that have complex ions as a component. These can be anions or cations (although I believe cations are more commonly outside the coordinate sphere).

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