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A Well-Defined Hydrocarbon-Soluble Calcium Hydroxide:  Synthesis, Structure, and Reactivity

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posted on 2006-11-22, 00:00 authored by Christian Ruspic, Sharanappa Nembenna, Anja Hofmeister, Jörg Magull, Sjoerd Harder, Herbert W. Roesky
Controlled hydrolysis of a (β-diketiminate)calcium-amide gave a heteroleptic (β-diketiminate)calcium-hydroxide complex that is remarkably stable against ligand exchange and formation of Ca(OH)2. The structure of this dimeric complex shows OH- units that symmetrically bridge the Ca2+ ions. This hydrocarbon-soluble calcium hydroxide reacted rapidly with CO2 to produce a gel from which amorphous CaCO3 slowly separated. This reaction behavior allows for sol−gel coating with CaCO3 from an organic solvent. Reaction with benzophenone did not lead to nucleophilic attack of OH- to the carbonyl but gave a red benzophenone adduct instead.