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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 6
BKCSDE 25(6)
June 20, 2004 

Crystal Structures and Magnetic Properties of Sparteinium Tetrahalocuprate Monohydrate Compounds
Yong-Min Lee, Sung-Min Park, Sung Kwon Kang, Young-Inn Kim, Sung-Nak Choi*
Copper(II), Anti-ferromagnetism, (?)-Sparteine, “Bromide-bromide” contact, Hydrogen bonding
The crystal structures of sparteinium tetrachlorocuprate monohydrate [(C15H28N2)CuCl4·H2O], 1 and sparteinium tetrabromocuprate monohydrate [(C15H28N2)CuBr4·H2O], 2, were determined. The structures of 1 [orthorhombic, P212121, a = 8.3080(10) A, b = 14.6797(19) A and c = 16.4731(17) A], and 2 [orthorhombic, P212121, a = 8.4769(7) A, b = 15.166(3) A and c = 16.679(3) A], are composed of a doubly protonated sparteinium cation, [C15H28N2]2+, a discrete CuX4 2? anion (X = Cl? or Br?), and one water molecule. These monomeric compounds are stabilized through various types of hydrogen bonding interaction in their packing structures. Crystal 2 exhibits weak anti-ferromagnetism (J = -3.24 cm?1) as opposed to the magnetically isolated paramagnetism observed for 1. The results of comparative magneto-structural investigations of 1 and 2 suggest that the pathway for the weak anti-ferromagnetic super-exchange in 2 might be through a Cu-BrBr-Cu contact.
823 - 828
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