Synthesis of Small Tetranuclear
Cu(I) Metallacycles
Based on Bridging Pseudohalogenide Ions
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Abstract
Three new ‘short’ metallacycles are selectively
obtained
from the reaction of a bimetallic Cu<sup>I</sup> ‘U-shape’
molecular clip with, respectively, the cyano CN<sup>–</sup>, tricyanomethanide C(CN)<sub>3</sub><sup>–</sup>, and azido
N<sub>3</sub><sup>–</sup> pseudohalogenide ions. These supramolecular
assemblies have been characterized by spectroscopic methods, single-crystal
X-ray diffraction, and elemental analysis. The single-crystal X-ray
structures of these complexes reveal no short contact interaction
between the pseudohalogenide ions within these self-assembled structures
despite the short Cu<sup>I</sup>···Cu<sup>I</sup> distances
within the molecular clips. The formation of these discrete metallacycles
is rationalized by analyzing the structural features of the Cu<sup>I</sup> ‘U-shape’ molecular clip