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iupac naming

iupac naming


 

Grade:

3 Answers

Godfrey Classic Prince
633 Points
9 years ago

Dear pankaj kumar,

The coordination compounds are named in the following way. (At the end of this tutorial we have some examples to show you how coordination compounds are named.)

A. To name a coordination compound, no matter whether the complex ion is the cation or the anion, always name the cation before the anion. (This is just like naming an ionic compound.)

B. In naming the complex ion:

  •  

      ? For anionic ligands end in "-o"; for anions that end in "-ide"(e.g. chloride), "-ate" (e.g. sulfate, nitrate), and "-ite" (e.g. nirite), change the endings as follows: -ide -o; -ate -ato; -ite -ito

      ? For neutral ligands, the common name of the molecule is used e.g. H2NCH2CH2NH2 (ethylenediamine). Important exceptions: water is called ‘aqua’, ammonia is called ‘ammine’, carbon monoxide is called ‘carbonyl’, and the N2 and O2 are called ‘dinitrogen’ and ‘dioxygen’.

  • 1. Name the ligands first, in alphabetical order, then the metal atom or ion. Note: The metal atom or ion is written before the ligands in the chemical formula.

    2. The names of some common ligands are listed in Table 1.

Table 1. Names of Some Common Ligands

Anionic Ligands

Names

 

Neutral Ligands

Names

Br-

bromo

 

NH3

ammine

F-

fluoro

 

H2O

aqua

O2-

oxo

 

NO

Nitrosyl

OH-

Hydroxo

 

CO

Carbonyl

CN-

cyano

 

O2

dioxygen

C2O42-

oxalato

 

N2

dinitrogen

CO32-

carbonato

 

C5H5N

pyridine

CH3COO-

acetato

 

H2NCH2CH2NH2

ethylenediamine

 

3. Greek prefixes are used to designate the number of each type of ligand in the complex ion, e.g. di-, tri- and tetra-. If the ligand already contains a Greek prefix (e.g. ethylenediamine) or if it is polydentate ligands (ie. can attach at more than one binding site) the prefixes bis-, tris-, tetrakis-, pentakis-, are used instead. (See examples 3 and 4.) The numerical prefixes are listed in Table 2.

Table 2. Numerical Prefixes

Number

Prefix

Number

Prefix

Number

Prefix

1

mono

5

penta (pentakis)

9

nona (ennea)

2

di (bis)

6

hexa (hexakis)

10

deca

3

tri (tris)

7

hepta

11

undeca

4

tetra (tetrakis)

8

octa

12

dodeca

 

4. After naming the ligands, name the central metal. If the complex ion is a cation, the metal is named same as the element. For example, Co in a complex cation is call cobalt and Pt is called platinum. (See examples 1-4). If the complex ion is an anion, the name of the metal ends with the suffix –ate. (See examples 5 and 6.). For example, Co in a complex anion is called cobaltate and Pt is called platinate. For some metals, the Latin names are used in the complex anions e.g. Fe is called ferrate (not ironate).

Table 3: Name of Metals in Anionic Complexes

Name of Metal

Name in an Anionic Complex

Iron

Ferrate

Copper

Cuprate

Lead

Plumbate

Silver

Argenate

Gold

Aurate

Tin

Stannate

 

5. Following the name of the metal, the oxidation state of the metal in the complex is given as a Roman numeral in parentheses.

C. To name a neutral complex molecule, follow the rules of naming a complex cation. Remember: Name the (possibly complex) cation BEFORE the (possibly complex) anion.

 

Hope this helped you immensely..

All the Very Best & Good Luck to you ...

 

Regards,

AskIITians Expert,

Godfrey Classic Prince

IIT-M

Please approve my answer if you liked it by clicking on "Yes" given below..!!Smile

ruchi yadav
askIITians Faculty 27 Points
7 years ago

TheIUPAC nomenclature of organic chemistryis asystematicmethod of namingorganic chemical compoundsas recommendedby theInternational Union of Pure and Applied Chemistry(IUPAC). Ideally, every possible organiccompoundshould have a name from which an unambiguousstructural formulacan be created.

For ordinary communication, to spare a tedious description, the official IUPAC naming recommendations are not always followed in practice, except when it is necessary to give an unambiguous and absolute definition to a compound, or when the IUPAC name is simpler (e.g. ethanol instead of ethyl alcohol). Otherwise the common ortrivial namemay be used, often derived from the source of the compound (see below). In addition, very long names may be less concise than structural formulae.



Thank You
Ruchi
Askiitians faculty



ruchi yadav
askIITians Faculty 27 Points
7 years ago

TheIUPAC nomenclature of organic chemistryis asystematicmethod of namingorganicchemical compoundsas recommendedby theInternational Union of Pure and Applied Chemistry(IUPAC). Ideally, every possible organiccompoundshould have a name from which an unambiguousstructural formulacan be created.

For ordinary communication, to spare a tedious description, the official IUPAC naming recommendations are not always followed in practice, except when it is necessary to give an unambiguous and absolute definition to a compound, or when the IUPAC name is simpler (e.g. ethanol instead of ethyl alcohol). Otherwise the common ortrivial namemay be used, often derived from the source of the compound (see below). In addition, very long names may be less concise than structural formulae.



Thank You
Ruchi
Askiitians faculty

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