Novel dinuclear open paddle-wheel-like copper complexes involving π-stacking on the basis of chiral binaphthyl phosphoric acid {(R)-PhosH}: structural, magnetic and optical properties†

This research embarked on the study of a new binaphthyl phosphate scaffold of copper. There are two independent neutral complexes in the asymmetric unit: Cu1/Cu2 (I) and Cu3/Cu4 (II) from a similar structure to paddle-wheel-like, with one arm formed by an intra-hydrogen bond between the water molecule bonded to the copper and the phosphine oxide (PO) moieties. Moreover, in the first complex two water and one ketone molecule complete the coordination sphere of the two-copper metals, instead, in the second one, one water and two ketone molecules. The experimental value obtained for the effective paramagnetic moment indicates that there is no appreciable interaction between the copper(II) cations and that they behave as paramagnetic ions over the entire temperature range explored (5–350 K).