ISBN: 978-83-60043-10-3 - eurobic9

Eurobic9, 2-6 September, 2008, Wrocław, Poland
P175. A Novel Paddlewheel Dicopper(II) Molecule
with Four µ2-N3,N7- [N1,N6-dideaza-adeninate(1-)] Bridges
C. Sánchez de Medina-Revilla a , D. Choquesillo-Lazarte b , A. Domínguez-Martín a ,
J.M. González-Pérez a , A. Castiñeiras c , J. Niclós-Gutiérrez a
a
Department of Inorganic Chemistry, University of Granada, Fac. Pharmacy, Campus Cartuja, E-18071
Granada, Spain
e-mail: celiasm@ugr.es
b
Laboratorio de Estudios Cristalográficos, IACT-CSIC, Edif. Inst Lopez-Neyra, PTCS. Avda. del Conocimiento
s/n, E-18100 Armilla, Granada, Spain
c
Department of Inorganic Chemistry, University of Santiago, Fac. Pharmacy, Campus Sur, E-15782 Santiago
de Compostela, Spain
The adeninate(1-) ion has probed to act as and µ-N3,N7,N9-bridging ligand, in an hexanuclear molecule [1]
and in a polymer [2]. Such a role would be displayed by 4-azabencimidazolate(1-) [also N1,N6-dideazaadeninate(1-),
4abim - ], but without a N6-H···A interaction reinforcing a metal-N7 bond. Reedijk et al. [3] have
reported the structure of [Cu2(µ2-N3,N7-4abim)4X2]X2·solvated salts (X = Cl or Br) and studied their strongly
anti-ferromagnetic coupling behaviour. Now we inform of the closely related paddlewheel centro-symmetric
molecule [Cu2(µ2-N3,N7-4abim)4(SO4)2]·12H2O (293 K, monoclinic, space group C2/c, final R 0.056,see
figure). Relevant inter-atomic distances (Å): Cu···Cu 2.960(1), Cu-N3 2.019(3), Cu-N9 2.016(3), Cu-O(sulphate)
2.113(14). In the crystal, pairs of H-bonding interactions N7-H···O(sulphate) give chains.
References:
[1] J.M. González-Pérez, C. Alarcón-Payer, A. Castiñeiras, T. Pivetta, L. Lezama, D. Choquesillo-Lazarte,
G. Crisponi, J. Niclós-Gutiérrez, Inorg. Chem., 45, 877 (2006).
[2] J.P. García Terán, O. Castillo, A. Luque, U. García Cruceiro, P. Román, Inorg. Chem., 43, 4549 (2004).
[3] G.A. van Albada, I. Mutikainen, U. Turpeinen, J. Reedijk, Polyhedron, 25, 3278 (2006).
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