24.2 Chelates

• Monodentate: attached at only one atom

• Polydentate: attached at two or more separated atoms

• ethylenediamine (en): NH2CH2CH2NH2 attaches at the two nitrogen atoms

• ethylenediaminetetraacetic acid (EDTA): (HOOCCH2)2NCH2CH2N(CH2COOH)2 attaches at up to six positions

• called a chelate

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