Abstract

A Cu(i) complex {[Cu-I(biq)(2)]ClO4-biq} with biq = 2,2-biquinoline was prepared, fully characterized and its properties compared with those of the well-known [Cu-I(biq)(2)]ClO4 complex. The crystal structures were obtained for both complexes (crystal structure for [Cu-I(biq)(2)]ClO4 has not been previously reported). Complex [Cu-I(biq)(2)]ClO4 crystallizes as a racemate where each enantiomer has a different (4) value while compound {[Cu-I(biq)(2)]ClO4-biq} crystallizes as a non-chiral supramolecular aggregate with an uncoordinated biq molecule forming a - stacking interaction with a coordinated biq. H-1-NMR spectroscopy in non-coordinating solvents reveals that structures in solution are similar to those in the solid phase, confirming the presence of a supramolecular arrangement for compound {[Cu-I(biq)(2)]ClO4-biq}. The stability of the non-covalent aggregate in solution of {[Cu-I(biq)(2)]ClO4-biq} causes significant differences between the spectroscopic and electrochemical properties of {[Cu-I(biq)(2)]ClO4-biq} and [Cu-I(biq)(2)]ClO4.