Question

IUPAC name of $[Pt{(N{H_3})_2}Cl(N{O_2})]$ is:
A. platinum diaminechloronitrite
B. chloronitrito-N-ammineplatinum (II)
C. diamminechloridonitrito-N-platinum (II)
D. diamminechloronitrito-N-platinate (II)

Answer 1

Hint:The coordination complexes follow different sets of IUPAC rules for their nomenclature. The naming of various coordination compounds are done based on the priority order of these IUPAC rules.

Complete step by step answer:
The set of rules for naming a coordination compound is:
(i) When naming a complex ion, the ligands are named before the metal ion.
(ii) Write the names of the ligands 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) The multiple occurring monodentate ligands receive a prefix according to the number of occurrences: di-, tri-, tetra-, penta-, or hexa. Polydentate ligands (e.g., ethylenediamine, oxalate) receive bis-, tris-, tetrakis-, etc.
(iv) Anions end with -ido. There is a replacement in the final “e” when the anion ends with “-ate” (e.g, sulfate becomes sulfato) and replaces with “-ide” (cyanide becomes cyanido).
(v) Neutral ligands are given by their usual name, with some exceptions:\[N{H_3}\] becomes ammine; \[{H_2}O\] becomes aqua or aqu; \[CO\] becomes carbonyl; \[NO\] becomes nitrosyl.
(vi) Write the name of the central atom/ion. If the complex is an anion, the central atom’s name will end in -ate, and its Latin name will be used if available (except for mercury).
(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.
Thus, based on these rules, the name of the above complex is diamminechloridonitrito-N-platinum (II).

The correct option is C. diamminechloridonitrito-N-platinum (II).

Note: More complicated coordination compounds are composed of a central metal atom or ion and a surrounding array of bound molecules or anions in the coordination sphere, known as ligands. The atom within a ligand that is bonded to the central atom or ion is called the donor atom. A typical metal complex is bound to several donor atoms, which can be the same or different.