Analytical Sciences

Abstract − Analytical Sciences, 19(4), 645 (2003).

Crystal Structure of {1,4-Bis[1-(3,5-dichlorophenolato-2-ylmethyl)-ylpropylamino-κ2N,O]piperazine-κ2N,N'}cobalt(II)
Koji KUBONO,*  Naoki HIRAYAMA,** Hisao KOKUSEN,*** and Kunihiko YOKOI*
*Division of Natural Science, Osaka Kyoiku University, Kashiwara, Osaka 582-8582, Japan
**Department of Chemistry, Faculty of Science, Kanazawa University, Kanazawa 920-1192, Japan
***Department of Environmental Engineering, Kanazawa Institute of Technology, Nonoichi, Ishikawa 921-8501, Japan
The X-ray crystal structure of the title complex, Co(Cl2bprpi) is described. In this complex the Co(II) center displays a distorted octahedral coordination geometry. The piperazine ring exhibits boat conformation, forming chelate rings and capping the Co atom. The N2-Co1-N3 angle is 69.41(15)°, extremely smaller than 90°. Because the small angle causes a large steric hindrance, the piperazine ring can be effective as an ion size-recognition site. The molecular structure is stabilized by intramolecular N-H···O hydrogen bonds and Cl···H contacts.