The Coordination Chemistry of Technetium

Add time:09/06/2019    Source:sciencedirect.com

Publisher SummaryThis chapter describes the coordination chemistry of technetium focusing on technetium(−I), technetium(0), technetium(I), technetium(II), technetium(III), technetium(IV), technetium(V), technetium(VI), and technetium(VII). Technetium(III) complexes with aminocarboxylato ligands have been observed but none are well characterized. 99mTc–iminodiacetate complexes formed with 2,6-alkylphenyl [ArNHCOCH2N(CH2COO)2]2− ligands are used to image the hepatobiliary system. One of the approaches to cationic myocardial imaging agents has been the development of neutral seven-coordinate Tc(III) complexes based on 1,2-dioxime ligands (dioximeH2) with one end capped by a boronic acid derivative. These complexes are generally referred to as boronic acid adducts of technetium dioximes (BATOs). The highest binary chloride of technetium is the dark red TcCl4 formed as the major product of the chlorination of Tc metal. Crystallography reveals a polymeric chain structure of C1-bridged distorted octahedral TcCl6 units. The structure and chemistry of the square-pyramidal five-coordinate and pseudo-octahedral six-coordinate [TcVO]3+ complexes are dominated by the strong tetragonal distortion induced by the multiply bonded oxo ligand.

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