Question

The complex compound \[\left[ Co{{\left( N{{H}_{3}} \right)}_{3}}N{{O}_{2}}ClCN \right]\] is named
A. \[\text{Chlorocyanonitrotriammine cobalt}\left( III \right)\]
B. \[Nitrochlorocyanotriammine\text{ }cobalt\left( III \right)\]
C. \[Cyanonitrochlorotriammine\text{ }cobalt\left( III \right)\]
D. \[Triamminenitrochlorocyano\text{ }cobalt\left( III \right)\]

Answer 1

Hint: The given question is related to the IUPAC nomenclature of coordination compounds. IUPAC has set certain rules for naming different coordination compounds which are accepted all over the world. So, we will proceed by keeping the nomenclature rules in mind.

Complete Step by Step Solution:
A coordination complex is made up of a core atom or ion, known as the coordination centre, which is typically metallic, and an array of attached molecules or ions that are known as ligands or complexing agents. It can be of two types, one in which the attacking group acts as an anionic part and the complex is acting as the cationic part or the other one in which the attacking group acts as a cation and complex acts as an anion.

The nomenclature rules are as follows:
- In the nomenclature of complicated coordination complexes, the ligands are always written before the main metal ion.
- The alphabetical order of the ligand names when the coordination centre is bound to many ligands is unaffected by the numerical prefixes that must be applied to the ligands.
- Prefixes of the type di-, tri-, tetra-, and so on provide information about the number of ligands when there are numerous monodentate ligands present in the coordination molecule.
- The prefixes are of the type bis-, tris-, and so forth when the core metal ion has several polydentate ligands linked to it.
- The letter "o," which typically takes the place of the letter "e," must terminate the names of the anions that are present in a coordination complex. The chloride anion must be expressed as "chlorido," and the sulphate anion must be written as "sulfato."
- In coordination compounds, the neutral ligands $N{{H}_{3}}$ (ammine), ${{H}_{2}}O$ (aqua or aqu), CO (carbonyl), and NO are given special names (nitrosyl).
- The name of the principal metal atom is written after the ligands have been identified. The prefix "-ate" is added if the complex carries an anionic charge.
- Priority is given to the Latin name of the metal when writing the name of the central metallic atom in an anionic complex, if one exists (with the exception of mercury).
- Roman numerals contained in a set of parentheses must be used to indicate the oxidation state of the central metal atom/ion.
- The cationic entity must be written before the anionic entity if the coordination molecule is accompanied by a counter ion.

After adhering to the rules of nomenclature we can name the compound \[\left[ Co{{\left( N{{H}_{3}} \right)}_{3}}N{{O}_{2}}ClCN \right]\] is \[Triamminenitrochlorocyano\text{ }cobalt\left( III \right)\].
Hence, the correct option is D. \[Triamminenitrochlorocyano\text{ }cobalt\left( III \right)\]

Note: A complex molecule is created when a positively charged ion is encircled by non-metals, various types of ligands, and d-block elements. A complex compound or coordination compound is the term used to describe that large chemical. Because numerous ligands contribute their electrons through the coordinate bonds, complex compounds are referred to as coordination compounds.