Deep-Dive Guides · Coordination Chemistry
Coordination Chemistry — the complete deep dive
A coordination compound is a metal centre surrounded by ligands, and almost every examinable fact flows from three counts: the oxidation state, the d-electron count, and the coordination number/geometry.
Free extract — the opening section of the guide, in full.
0. How to use — the three counts
Before anything else, extract three numbers from the formula. They unlock the whole topic.
| Count | How to get it | What it unlocks |
|---|---|---|
| Oxidation state | overall charge − Σ(ligand charges) | nomenclature, redox, d-count |
| d-electron count | group electron count − oxidation state | magnetism, CFSE, spectra, geometry preference |
| Coordination number / geometry | count donor atoms (denticity!) | isomerism, splitting pattern, mechanism |
The three questions for any complex: (1) What is the metal oxidation state and dⁿ configuration? (2) What is the coordination number and geometry (watch for chelating/ambidentate ligands)? (3) Is the field strong or weak (spectrochemical series) → high/low spin → magnetism & colour. Master these and isomer counting, magnetism and mechanism all follow.
Read the rest of this guide
The remaining 12 sections — Werner's coordination theory, IUPAC nomenclature, Isomerism, Bonding: VBT and CFT at working level and more — are part of ChemVidya Full Access, along with the other guides, the books, the study notes and 6,000+ practice questions with worked solutions.