Reaction of the tetradentate pendant-arm macrocycle 1,4,7-triazacyclononane-N-acetate (L) with Zn(O3SCF3)2 or Mg(O3SCF3)2 in alcohol produces the six-coordinate complexes [ZnL(H2O)]O3SCF3·C2H5OH (1) and [MgL(H2O)2]O3SCF3 (2). Compounds 1 and 2 were characterized by single-crystal X-ray crystallography. The complex cation of 1 forms a polymeric chain with zinc centers bridged in a syn, anti fashion by acetate pendant arms. The complex cation of 2 is mononuclear, with two adjacent coordination sites on magnesium occupied by water molecules. These labile coordination sites may provide a binding site for activation of substrates in functional modeling of magnesium enzymes such as RuBisCo. 1H and 13C NMR spectroscopy demonstrates that L remains bound to magnesium in methanol solution. Crystal data: 1, orthorhombic, space group P212121, a = 9.0536(7), b = 14.3750(11), c = 14.4741(11) Å, V = 1883.7(2) Å3, Z = 4, R = 0.041; 2, orthorhombic, space group P212121, a = 8.5949(3), b = 13.9694(4), c = 14.0076(5) Å, V = 1681.83(10) Å3, Z = 4, R = 0.0248. (C) 2000 Elsevier Science S.A.
Bibliographical noteFunding Information:
Financial support from the American Chemical Society Petroleum Research Fund, Exxon Education Foundation, University of South Florida Division of Sponsored Programs, and the New College Foundation is gratefully acknowledged. Research conducted by CJG was aided by a Grant-in-Aid of Research from the National Academy of Sciences, through Sigma Xi, The Scientific Research Society. The authors thank Dr Paul H. Scudder for many thoughtful contributions to this work.
Copyright 2020 Elsevier B.V., All rights reserved.
- Azamacrocycle complexes
- Crystal structures
- Magnesium complexes
- Zinc complexes