Question

Write the IUPAC name of $[Ag{(N{H_3})_2}][Ag{(CN)_2}]$ coordination compound.

Answer 1

Hint:The International Union of Pure and Applied Chemistry have set some ground rules which should be strictly followed while naming the coordination compounds. The process of naming of the compounds on the basis of the IUPAC rules is known as IUPAC nomenclature.

Complete step by step answer:
The salient points which must be kept in mind before naming any coordination is:
(i) When a complex ion is named, the ligands are named before the metal ion.
(ii) The names of the ligands are written in the following order: neutral, negative, positive. If there are multiple ligands of the same charge type, they are named in alphabetical order. (Numerical prefixes do not affect the order.)
(iii) Multiple occurring monodentate ligands receive a prefix according to the number of occurrences: di-, tri-, tetra-, penta-, or hexa. The polydentate ligands such as ethylenediamine (en), oxalate, etc receive bis-, tris-, tetrakis-, etc.
(iv) Anions end with the suffix name -ido. This replaces the final “e” when the anion ends with “-ate” (e.g, sulfate becomes sulfato) and replaces “-ide” (cyanide becomes cyanido).
(v) Neutral ligands are given their usual name, with some exceptions: \[N{H_3}\] becomes ammine; \[{H_2}O\] becomes aqua; \[CO\] becomes carbonyl; \[NO\] becomes nitrosyl.
(vi) Next, the name of the central atom/ion is written. If the complex is an anion, the central atom’s name will end with a suffix name of -ate, and its Latin name will be used if available.
(vii) If the central atom’s oxidation state needs to be specified (when it is one of several possible, or zero), write it as a Roman numeral (or 0) in parentheses.
Based on the above rules, the name of the compound is diammine silver (I) dicyanoargentate (I).


Note:The name of a complex ion is given by giving names to the ligands and then the metal ion. The oxidation number of the metal ion is written next to the central metal atom/ ion in roman numerals within the parenthesis. A complex anion is named by naming the ligands and then the name of the metal ion ending with suffix -ate. The oxidation number of the metal ion is written next to the metal ion in Roman number in parenthesis.