Anatomy of a coordination compound: K₄[Fe(CN)₆]उपसहसंयोजन यौगिक के भाग: K₄[Fe(CN)₆]Anatomy of a coordination compound: K₄[Fe(CN)₆]

NCERT §5.2 · Class 12 Chemistry · Chapter 5 · interactive diagram

Parts and what they mean

• Counter ions (4 K⁺) (प्रति आयन (4 K⁺)) — Ionisable groups written outside the square bracket. They balance the −4 charge of the complex ion.
• Coordination sphere [Fe(CN)₆]⁴⁻ (समन्वय मंडल [Fe(CN)₆]⁴⁻) — The central ion and the ligands attached to it, enclosed in square brackets. Its charge is written as a right superscript.
• Central atom/ion: Fe²⁺ (केंद्रीय परमाणु/आयन: Fe²⁺) — The ion to which a fixed number of ligands is bound in a definite geometry. It accepts electron pairs, so it is a Lewis acid.
• Ligand: CN⁻ (cyanido) (लिगन्ड: CN⁻ (सायनिडो)) — Ions or molecules bound to the central ion. CN⁻ is unidentate: it binds through one donor atom.
• Donor atom: C of CN⁻ (दाता परमाणु: CN⁻ का C) — The atom of the ligand that actually donates the electron pair to the metal.
• Coordination polyhedron: octahedral (समन्वय बहुफलक: अष्टफलकीय) — The spatial arrangement of the six donor atoms around Fe: an octahedron.
• Oxidation number and coordination number (ऑक्सीकरण संख्या और समन्वय संख्या) — Oxidation number = charge left on Fe if all ligands are removed with their shared electron pairs: +2, written Fe(II). Coordination number = number of donor atoms bonded = 6.

Original diagram drawn by Simple Learning Hub, based on NCERT §5.2. Report a mistake