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Cover Picture: Supramolecular Open‐Framework of a Bipyridinium‐Carboxylate Based Copper Complex with High and Reversible Water Uptake (Z. Anorg. Allg. Chem. 24/2016)
Author(s) -
Leroux Maxime,
Weber Guy,
Bellat JeanPierre,
Bezverkhyy Igor,
Mercier Nicolas
Publication year - 2016
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201670241
Subject(s) - carboxylate , supramolecular chemistry , crystallography , chemistry , copper , ligand (biochemistry) , adsorption , crystal structure , stereochemistry , organic chemistry , biochemistry , receptor
The cover picture shows water adsorption on [Cu( pc1 ) 2 Cl 2 ] ( pc1 = 1,1'‐bis(4‐carboxylatphenyl)‐(4,4'‐bipyridinium) giving the supramolecular open‐framework compound [Cu( pc1 ) 2 (H 2 O) 4 ](Cl) 2 8H 2 O. The rigid zwiterrionic viologen‐carboxylate ligand ( pc1 ) and copper(II) ions give rise to a linear complex [Cu( pc1 ) 2 (H 2 O) 4 ] 2+ which self assemble in a pseudo tetragonal supramolecular arrangement leading to [Cu( pc1 ) 2 (H 2 O) 4 ](Cl) 2 8H 2 O exhibiting an open structure including water molecules and chlorides in pores. The dehydration of this material occurs at relatively low temperature (70°C) and results in structure modification accompanied by shrinking of the crystals. Characterizations of the dehydrated material reveal appearance of coordinated carboxylates groups as well as a decrease of the unit cell volume of 25% indicating the formation of a dense coordination polymer network. The water adsorption of the dehydrated material allowing to restore the intial structure is high (uptake of 0.23 g/g). In the middle of the picture, the water adsorption‐desorption isotherm exhibits a large hysteresis which is characterterisic of a significant modification of the structure during the hydration‐dehydration cycle. This is in line with the structural transition determined from thermodiffractometry and FTIR. More details are discussed in the article by N. Mercier, I. Bezverkhyy et al. on pp. 1439 .