Abstract
{[CdCl(2,2′-bipy)2(H2O)]+·[Cd(3-O−-2,7-NDS)(2,2′-bipy)2]−·3H2O} (1) and {[Cd(phen)3]2+·2[Cd(3-O−-2,7-NDS)(phen)2]−·8.5H2O} (2) (3-OH-2,7-NDS = 3-hydroxy-2,7-naphthalenedisulfonate, phen = 1,10-phenanthroline, and 2,2′-bipy = 2,2′-bipydine) were prepared and characterized by X-ray single-crystal diffraction. Compound 1 contains a discrete coordination cation [CdCl(2,2′-bipy)2(H2O)]+ and a coordination anion [Cd(3-O−-2,7-NDS)(2,2′-bipy)2]−; 2 contains a discrete coordination cation [Cd(phen)3]2+ and two coordination anions [Cd(3-O−-2,7-NDS)(phen)2]−. There are numerous weak interactions among the coordination cation, coordination anion, and free water molecules, such as O–H ··· O hydrogen bonds, π ··· π stacking, and Cl− ··· π interactions in 1 and π ··· π stacking and C–H ··· π interactions in 2. The cations and anions as building blocks are connected to construct different 3-D supramolecular architectures via weak intermolecular interactions. Particularly, the capsule structure of 1 was observed.
Acknowledgments
We are grateful to the National Natural Science Foundation of China (21071101) and the Science and Technology Program, Beijing Municipal Education Commission (KM200910028010).