Two cadmium(II) addition compounds with 3-hydroxy-2,7-naphthalenedisulfonate containing aromatic diamines and their 3-D net

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.

Keywords:

• Cadmium addition compound
• 3-Hydroxy-2,7-naphthalenedisulfonate
• Aromatic diamine
• Crystal structure

Acknowledgments

We are grateful to the National Natural Science Foundation of China (21071101) and the Science and Technology Program, Beijing Municipal Education Commission (KM200910028010).