Chiral Golden Rings

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Science  16 Dec 2005:
Vol. 310, Issue 5755, pp. 1745
DOI: 10.1126/science.310.5755.1745b

The self-assembly of a large chiral aggregate with luminescent properties from achiral building blocks is reported by Yu et al., who have exploited aurophilic interactions between Au(I) atoms to drive assembly. Two equivalents of the Au(I) dimer, [Au2(dppm)Cl2] where dppm is the bridging bis(diphenylphosphino)methane ligand, bind to piperazine-1,4-dicarbodithiolate in anhydrous methanol; the thiol groups add a second bridging group to two gold dimers. This compound crystallizes as a tetramer in which the 16 gold atoms form a continuous loop: The two pairs of gold atoms from one monomer bind to the ends of a pair from an adjacent monomer, and two sets of bridging groups end up on each side of the loop. This interleaved cyclic assembly imparts chirality on the tetramer, which crystallizes with a 70% preference for one form in each sample prepared (but with essentially equal probability of either handedness for any given sample). The tetramer also displays intense green phosphorescence. — PDS

J. Am. Chem. Soc. 10.1021/ja0565727.

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