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| - Asymmetric Synthesis of Mono- and Dinuclear Bis(dipyrrinato)Complexes
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| - The diastereoselective syntheses of Zn(II) bis(dipyrrinato) helicates is reported, involving ligands templatedby the incorporation of homochiral binol within the linker joining the two dipyrrinato units. The mostdiastereoselective formation of dinuclear bis(dipyrrinato) helicates to date is reported. The formation ofeither mononuclear or dinuclear helicates can be tuned by varying the length of the linker between thedipyrrinato units and by varying the complexation procedure. The neutral dipyrrinato helicates werereadily analyzed by HPLC to ascertain diastereoselectivity, and circular dichroism studies revealed thehelical nature of the complexes. The molar ellipticities of the helicates produced by diastereoselectivecomplexation are very large in the visible region and typically correspond to binol moieties in the UVregion. Extensive X-ray crystallographic investigations further confirmed the helicity of the mononuclearZn(II) helicates and identified significant interlayer displacement and bending within crystals.
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