Novel dioxotetrazamacrocyclic “sandwich” complexes – synthesis and structural characterization
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Reaction of 1,4,7,10-tetraazacyclododecane-2,9-dione with copper and cobalt perchlorate in water at 1:1 molar ratio afforded two new crystal-engineered 1:2 'sandwich' type complexes. Both of them are isostructural analogues. Copper complex crystallized in monoclinic space group P21/c with a = 9.6888(12), b = 12.2956(16), c = 10.5661(13), β = 104.965(2)°, V = 1216.0(3) Å3, and Z = 2. The Cu(II) ions are six-coordinated by four nitrogen atoms and two amide oxygen atoms. Their coordination geometry can be described as Jahn-Teller distorted octahedra, with elongated Cu-O distances. (2.310(2) Å) Cobalt complex crystallized in monoclinic space group P21/c with a = 9.7560(12), b = 12.237(16), c = 10.7130(13), β = 105.194(3)°, V = 1234.2(4) Å3, and Z = 2. The Co(II) ions are also six-coordinated by similar atoms as found in copper complex. But the bond lengths of Co-O 2.0881(13) Å are slightly shorter than respective Co-N. © 2002 Elsevier Science B.V. All rights reserved.
author list (cited authors)
Kong, D., Ouyang, X., Martell, A. E., & Clearfield, A.