Cyclic water clusters in tape-like and cage-like structures.

Qin Huang,Fuhou Lei,Chuang Zhang,Lihong Diao

doi:10.3390/molecules16042871

Qin Huang, Fuhou Lei + Show 2 more

Open Access

https://doi.org/10.3390/molecules16042871

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Abstract

Controlling the ratio of 2,2′-bpy to benzene-1,3,5-tricarboxylic acid produces two interesting complexes, namely [Co(2,2′-bpy)3]·(SO4)·8.5H2O (1) and [Cu2(BTCA) (2,2′-bpy)4] (OH)·(2,2′-bpy)0.5·14H2O (2) (H3BTCA = benzene-1,3,5-tricarboxylic acid, 2,2′-bpy = 2,2′-bipyridine). We report the structural evidence in the solid state of discrete lamellar water cluster conformations. These units are found to act as supramolecular glue in the aggregation of cobalt (II) or copper (II) complexes to give three dimensional cage-like networks through hydrogen-bonding. It is interesting that the structure of complex 1 contains a 3D negatively charged cage.

Highlights

There is hardly a compound that has been more thoroughly investigated than water, and this is due to its importance in many biological, chemical, and physical processes [1]
We report the structural evidence in the solid state of discrete lamellar water cluster conformations
Water clusters can play an important role in the stabilization of supramolecular systems both in solution and in the solid state, and there is clearly a need for a better understanding of Molecules 2011, 16 how such water aggregations are influenced by the overall structure of their surroundings [15,16,17,18,19,20]

Summary

Introduction

There is hardly a compound that has been more thoroughly investigated than water, and this is due to its importance in many biological, chemical, and physical processes [1]. Water clusters can play an important role in the stabilization of supramolecular systems both in solution and in the solid state, and there is clearly a need for a better understanding of Molecules 2011, 16 how such water aggregations are influenced by the overall structure of their surroundings [15,16,17,18,19,20]. A systematic variation of these backbones and determination of the corresponding water layers will improve our understanding of the structures of water. In this context, we have succeeded in obtaining two novel cobalt (II) and copper (II) complexes [Co(2,2′-bpy)3]·(SO4)·8.5H2O (1) and [Cu2(BTCA) (2,2′-bpy)4] (OH)·(2,2′-bpy)0.5·14H2O (2) [26,27]. The unusual 3D water cluster is stabilized by the hydrophobic hosts [28,29,30,31,32] that undergo hydrogenbonding to two adjacent hydrogen bond sheets

Results and Discussion

Materials and Physical Measurements

Synthesis of 1-2

Single-crystal Structure Determination

Conclusions