Contribution to cation–π interaction of the univalent silver cation with racemic helicene in the solid state
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Yellow crystals of the complex helicene–silver perchlorate (i.e., C30H18–AgClO4 or more accurately [Ag(η4-C30H18)]ClO4, respectively), crystallizing in the monoclinic system with the centrosymmetric P21/c space group, where a = 14.4230(3) Å, b = 10.2804(3) Å, c = 15.2541(4) Å, and β = 91.856(2)°, were prepared by slow evaporation of the solvent from a solution obtained by mixing equimolecular amounts of racemic helicene and silver perchlorate in toluene at ambient temperature. Characteristic feature of the complex packing in the solid state is the formation of infinite antiparallel layers of dimeric structures of the proven complex. The investigated helicene ligand in the racemic form functions as a molecular tweezer for the univalent silver cation.
KeywordsUnivalent silver cation Helicene Cation–π interaction X-ray crystallography Solid-state complex structure
This work was supported by the Grant Agency of Faculty of Environmental Sciences, Czech University of Life Sciences, Prague, project no.: 42900/1312/3114, “Environmental Aspects of Sustainable Development of Society,” by the Czech Ministry of Education, Youth, and Sports (project MSMT no.: 20/2015), as well as by the Grant Agency of the Czech Republic (projects 13-21409P and P207/10/1124). Further, we appreciate for financial support from the Technology Agency of the Czech Republic (grant no.: TA01010646) and the Czech Ministry of Industry and Trade (grant no.: FR-T13/628).
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