Tropolonato complexes anionic

Tropolonato Complexes.12 A system similar to the / -diketonates is provided by tropolone and its anion (21-XXlX). The tropolonato ion gives many complexes that are broadly similar to analogous /1-diketonate complexes, although there are often very significant differences. 

Anionic pentakis tropolonato complexes, M [M (trop)s], are known for M = Th (M = Li, Na or K), M = Pa or U (M = Li). TTie thorium compounds are prepared by heating Th(trop)4 with H trop and M OH in a mixture (1 1 2 by volume) of ethanol, water and methyl cyanide. Li[Pa(trop)s] has been obtained from Pa(trop)4 in the presence of Li(trop) in DMF, and Li[U(trop)5] has been prepared by both of the above methods. Sodium salts, Na[ThLs], are also known for HL = a- and y-isopropyltropolone. 

Cationic 8-coordinate complexes with tropolonato and /3-diketonato anions, for example, [M(/3-dike)4]+, are also well known. 

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