Role of Water and Solvent in the Formation of Three Mononuclear Copper(II) Crystals: A New Type of Hydrate Isomerism in Coordination Chemistry

✍ Scribed by Susanta Hazra; Rajesh Koner; Malabika Nayak; Hazel A. Sparkes; Judith A. K. Howard; Supriya Dutta; Sasankasekhar Mohanta

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 482 KB
• Volume: 2009
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200900432

✦ Synopsis

Refluxing of the red compound [Cu II L 1 ʚ(H 2 O)] (1) in acetone forms two new species: green NЈ-ethylenebis(3-ethoxysalicylaldimine)]. Whereas both 1 and 2 are converted into 3 upon heating, 3 is converted back into 1 when exposed to air. The structures of all three compounds were determined crystallographically, from which the interesting hydrate isomerism of 1 and 2 are identified; in 1 a water molecule is encapsulated into the O 4 section of the ligand through bifurcated hydrogen bonding, whereas in 2 a water molecule coordinates directly to the metal centre. Despite the metal ion binding to the ligand in the same manner in all three cases, the formation of different mononuclear complexes resulting from the pres-[a