Chapter 132 of 2363 min read

Nomenclature and Werner's theory

Why this is asked: Werner's key distinction is primary valence (ionisable, the oxidation state) versus secondary valence (non-ionisable, the fixed coordination number and geometry) — a complex's conductivity in solution tests exactly this, since only ions outside the coordination sphere carry current. In naming, ligands are listed alphabetically by name regardless of charge or multiplying prefix (bis, tris), and an anionic complex ion always ends in "-ate."

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Test yourself

•Given below are two statements: Statement I: $[Co (N H_{3})_{6}]^{3 +}$ is a homoleptic complex whereas $[Co (N H_{3})_{4} C l_{2}]^{+}$ is a heteroleptic complex. Statement II: The complex $[Co (N H_{3})_{6}]^{3 +}$ has only one kind of ligand but $[Co (N H_{3})_{4} C l_{2}]^{+}$ has more than one kind of ligand. In the light of the above statements, choose the correct answer from the options given below:

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