Resonance structures for urea are represented below: The IR spectrum of free urea has absorptions at 3500 and 3350 (v(NH2)), 1683 (KCO)) and 1471cm-1 (v (CN)). Urea can bond to metal ions through either an N- or O-donor atom. When urea bonds through the O atom, the contribution from resonance form A decreases. In the IR spectrum of [Pt(urea)6]Cl2, bands at 3390, 3290, 3130, 3030, 1725 and 1395 cm-1 are assigned to the vibrational modes of metal-bound urea. Suggest why these data suggest the formation of Pt-N rather than Pt-0 bonds.
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