Chemistry · Ch 5 — Coordination Chemistry
Worked Examples of IUPAC Nomenclature
Worked Examples of IUPAC Nomenclature
Three fully worked examples showing every step of building an IUPAC name -- identify the cation and anion, name each ligand with its correct multiplying prefix and κ-term where needed, alphabetise, name the central metal with the right cationic/anionic form and compute its oxidation state from the charge-balance equation -- followed by a reference list of sixteen further name …
Cation (simple): K⁺, potassium. Anion (complex): [Fe(CN)₆]⁴⁻. Ligand: CN⁻, six of them (prefix hexa), anionic donor atom carbon so named hexacyanido-κC. Central metal: Fe in an anionic complex, so 'ferrate'. Oxidation state: x + 6(-1) = -4, so x = +2, written (II). I …
Cation (complex): [Co(NH₃)₄Cl₂]⁺. Ligands: NH₃ (4, neutral, 'ammine') and Cl⁻ (2, anionic, 'chlorido'); alphabetically ammine precedes chlorido, giving tetraamminedichlorido. Central metal: Co in a cationic complex, so 'cobalt'. Oxidation state: x + 4(0) + 2(-1) = +1, so x = +3, written (III). Anion (simple): Cl⁻, chlorid …
Cation (complex): [Cr(en)₃]³⁺. Ligand: en (ethane-1,2-diamine), 3 of them; since 'ethylenediamine' itself contains a Greek-derived prefix, the alternate multiplier 'tris' is used, giving tris(ethane-1,2-diamine). Central metal: Cr in a cationic complex, so 'chromium'; oxidation state x + 3(0) = +3, so x = +3, written (III). Anion (complex): [CrF₆]³⁻. Ligand: F⁻, six of them (hexa), anionic so 'fluorido', giving hexafluorido. Central metal: Cr in an anionic complex, so 'chromate'; oxidation state x + 6(-1) = -3, so x = +3 …
Worked out. A reference list pairing each formula with its IUPAC name: [Ag(NH₃)₂]Cl = Diamminesilver(I) chloride; [Co(en)₂Cl₂]Cl = Dichloridobis(ethane-1,2-diamine)cobalt(III) chloride; [Cu(NH₃)₄]SO₄ = Tetraamminecopper(II) sulphate; [Co(CO₃)(NH₃)₄]Cl = Tetraamminecarbonatocobalt(III) chloride; [Cr(NH₃)₃(H₂O)₃]Cl₃ = Triamminetriaquachromium(III) chloride; K₃[Fe(CN)₅NO] = Potassium pentacyanidonitrosylferrate(II); Na₂[Ni(EDTA)] = Sodium 2,2',2'',2'''-(ethane-1,2-diyldinitrilo)tetraacetatonickelate(II); [PdI₂(ONO)₂(H₂O)₂] = Diaquadiiododinitrito-κO palladium(IV); [Cr(PPh₃)(CO)₅] = Pentacarbonyltriphenylphosphanechromium(0); [Co(NO₂)₃(NH₃)₃] = Triamminetrinitrito-κNcobalt(III); [Co(NH₃)₅CN][Co(NH₃)(CN)₅] = Pentaamminecyanido-κCcobalt(III) amminepentacyanido-κCcobaltate(III); [Pt(py)₄][PtCl₄] = Tetrapyridineplatinum(II) tetrachloridoplatinate(II); [Co(NH₃)₄Cl₂]₃[Cr(CN)₆] = Tetraamminedichloridocobalt(III) hexacyanido-κCchromate(III); [Ag(NH₃) …
Worked out. A self-check box with two parts. Part 14 asks for IUPAC names of five given complexes covering a K⁺ salt of a mixed-ligand cobalt anion, a chromium-oxalate/aqua/cyanide anion, a copper-ammine-chloride complex, a chromium cation with ammine and isocyanide/aqua ligands, and the ferrocyanide ion -- practising the full name-building sequence of Section 5.4.4. Part 15 reverses the exercise, asking the student to derive the structure/formula from five given IUPAC-style names: diamminesilver(I) dicyanidoargentate(I), pentaamminenitrito-κN-cobalt(III) ion, hexafluoridocobaltate(III) ion, dichloridobis(ethylenediamine …