89579-62-4Relevant academic research and scientific papers
Anisotropic exchange in transition-metal dinuclear complexes. 2. Crystal and molecular structure and EPR spectra of a dinuclear copper oxamidato complex
Bencini,Di Vaira,Fabretti,Gatteschi,Zanchini
, p. 1620 - 1623 (2008/10/08)
The compound (μ-N,N′-bis(6-ethyl-3,6-diazaoctyl)oxamidato(2-)-N1,N 3,N6,O:N1′,N3′,N 6′,O′)dicopper(II) bis(tetra-phenylborate)-2-acetone, Cu2L(BPh4)2·2(CH3) 2CO, was synthesized and its crystal structure solved at room temperature. It crystallizes in the monoclinic system, space group P21/n, with Z = 2. The lattice constants are a = 16.639 (7) A?, b = 18.305 (9) A?, c = 11.089 (9) A?, and β = 103.2 (2)°. Least-squares refinement of the structure led to a conventional R factor of 0.055. The structure consists of centrosymmetric dinuclear species Cu2L+, tetraphenylborate anions, and acetone solvent molecules. The single-crystal EPR spectra reveal that the zero-field splitting tensor is dominated by the magnetic dipolar contribution, although substantial magnetic exchange is operative between the two x2-y2 ground magnetic orbitals. The small exchange contribution to the zero-field splitting is related to the exchange pathway between a ground x2-y2 and an excited xy magnetic orbital, which is rather ineffective in the present case.
