[Verse 1] Ten columns wide, the d-block lets electrons slide Variable charge — iron rides from two up to five Colors bloom whenever d orbitals split apart Ligands knock the electrons, that's the whole art Paramagnetic pull when unpaired spins align Catalysts on the surface, breaking bonds in line Complex ions form — metal center, ligand crowd Coordination chemistry, say it loud [Chorus] d to d, watch the color glow CN and CO, strong field, steady flow Weak field ligands, high spin, wide Spectrochemical order is your guide Four, five, six coordinate, geometry bends Chelate rings hold tighter than casual friends Lanthanide contraction shrinks the 5d down 4d and 5d radius wear the same crown [Verse 2] Octahedral splitting: t2g sits below eg's the higher shelf, energy gap's the show Iron-six-cyanide — strong field, low spin, pairs stacked tight Iron-six-water — weak field, high spin, pale twilight site Cobalt chloride, tetrahedral, blue as the dusk Nickel cyanide, square planar, d-eight, no spin left to trust Jahn-Teller stretches copper's axial bond in two Elongated octahedra — that's the distortion clue [Verse 3] Cis and trans, geometric twins in a coordinate cage Cobalt-en-two-chloride, count the isomers on the page Optical twins mirror without a plane to split Chiral when the image and reflection never fit Ligands stay labile — quick to swap, exchange with ease While ethylenediamine bites twice — the chelate's the key Eighteen-electron rule keeps organometallics stable Ferrocene: iron sandwiched, two rings at the table [Chorus] d to d, watch the color glow CN and CO, strong field, steady flow Weak field ligands, high spin, wide Spectrochemical order is your guide Four, five, six coordinate, geometry bends Chelate rings hold tighter than casual friends Lanthanide contraction shrinks the 5d down 4d and 5d radius wear the same crown [Bridge] Wilkinson's rhodium hydrogenates the alkene chain Grubbs swaps double bonds, ruthenium reigns Palladium couples aryl halides across the divide Haber-Bosch iron catalyst, ammonia supplied Platinum, rhodium, palladium — your tailpipe's disguise Turning poison gases clean before they meet the skies Hemoglobin's iron breathes, cytochromes move the charge Zinc finger folds the gene, carbonic anhydrase at large Cobalt's B12 rearranges, molybdenum grips nitrogen tight Manganese-four splits water in the photosystem light Cadmium, mercury, chromium-six — handle these with care Verdigris, that green patina, copper's oxide laid bare
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