Abstract
Abstract The crystal structures of several crown ether and polyethylene glycol complexes of HgX2 (X=Cl, Br, I) have been investigated. The crown ether complexes studied are [HgX2(18-crown-6)] (X=Br, I) and [HgI2(dibenzo-18-crown-6)]·CH3CN. In each case Hg resides in the cavity of the ether resulting in hexagonal bipyramidal geometry with axial, terminal halides. The covalently bonded halides reside closer to Hg than the oxygen donor atoms. Five polyethylene glycol complexes have been structurally characterized: [(HgCl2)3(EO3)], [HgX2(EO4)] (X=Br, I), [HgCl2(EO5)], and [HgBr2(EO5)HgBr2]2 (EO3=triethylene glycol, EO4=tetraethylene glycol, EO5=pentaethylene glycol). The EO4 and EO5 glycols mimic crown ethers by forming an equatorial girdle around Hg although in each case one alcoholic terminal end does not coordinate to the metal ion. Each complex also has two covalent, nearly linear, axial halides coordinated to Hg. In [(HgCl2)3(EO3)], the glycol is linear and coordinates to three Hg atoms all on the same s...
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