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Tapes of Cyclic Water Tetramers in the Double‐Helical Complex[Cd 2 (bpa) 2 Cl 4 ]·6 H 2 O
Author(s) -
Ye BaoHui,
Sun AiPing,
Wu TongFei,
Weng YanQin,
Chen XiaoMing
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400956
Subject(s) - chemistry , hydrogen bond , molecule , crystallography , azine , ligand (biochemistry) , enthalpy , stereochemistry , yield (engineering) , chirality (physics) , medicinal chemistry , organic chemistry , receptor , materials science , chiral symmetry breaking , nambu–jona lasinio model , biochemistry , physics , quantum mechanics , metallurgy , quark
The new complex [Cd 2 (bpa) 2 Cl 4 ] · 6 H 2 O [bpa = N , N ' ‐bis(picolinamide)azine] has been synthesized in which each bpa ligand is twisted into a spiral‐like conformation and the two Cd II ions are ligated by two bpa ligands to form a double‐stranded binuclear helicate. Unprecedented water chains featuring cyclic water tetramers composed of three independent water molecules are trapped by [Cd 2 (bpa) 2 Cl 4 ] double helicates by hydrogen bonds. The binuclear chiral helicates are interlinked into homochiral layers by hydrogen bonds with the water tapes. The layers are alternately stacked in a heterochiral fashion to yield the final racemic structure. The complex shows an endotherm at 65.7 °C in the DSC due to loss of water molecules, giving an enthalpy value of 47 kJ mol –1 per water molecule. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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