Abstract
The structure of the title compound, [Cu(ClO4)2(C16H38N6)] has been determined from synchrotron data, λ = 0.62988 Å. The asymmetric unit comprises one half of the Cu(II) complex as the Cu(II) cation lies on an inversion center. It is coordinated by the four secondary N atoms of the macrocyclic ligand and the mutually trans O atoms of the two perchlorate ions in a tetra-gonally distorted octa-hedral geometry. The average equatorial Cu-N bond length is significantly shorter than the average axial Cu-O bond length [2.010 (4) and 2.569 (1) Å, respectively]. Intra-molecular N-H⋯O hydrogen bonds between the macrocyclic ligand and uncoordinating O atoms of the perchlorate ligand stabilize the mol-ecular structure. In the crystal structure, an extensive series of inter-molecular N-H⋯O and C-H⋯O hydrogen bonds generate a three-dimensional network.
Highlights
The structure of the title compound, [Cu(ClO4)2(C16H38N6)] has been determined from synchrotron data, = 0.62988 Å
Macrocyclic CuII complexes with vacant sites in the axial positions are good building blocks for assembling multidimensional frameworks (Ko et al, 2002), with potential applications as metal extractants, radiotherapeutic materials and as medical imaging agents (Sowen et al, 2013)
CuII complexes with tetra-azamacrocyclic ligands have been studied with various auxiliary anionic ligands such as ferricyanide and hexacyanidochromate and their biological redox-sensing and magnetic properties (Xiang et al, 2009)
Summary
Coordination compounds with macrocyclic ligands have attracted considerable attention in chemistry, biological chemistry and materials science (Lehn, 1995). Macrocyclic CuII complexes with vacant sites in the axial positions are good building blocks for assembling multidimensional frameworks (Ko et al, 2002), with potential applications as metal extractants, radiotherapeutic materials and as medical imaging agents (Sowen et al, 2013). The perchlorate ion is a versatile anion which can bridge two transition metal complexes, allowing the assembly of multi-dimensional compounds (Kwak et al, 2001). Jahn–Teller distortion of the CuII ion and/or to a considerable ring contraction of the azamacrocyclic ligand (Halcrow, 2013). Intramolecular N—H O hydrogen bonds between the secondary amine groups of the azamacrocyclic ligand and an O atom of each perchlorate ion contribute to the molecular conformation (Fig. 1 and Table 1)
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