X-Ray evidence of intermolecular stacking interactions in a ternary complex. Crystal and molecular structure of the complex bis(N-benzyloxycarbonylglycinato)(2,2′-bipyridine)(propan-2-ol)-copper(II)

Abstract

The title compound, [Cu(bglyO)₂(bipy)(PrⁱOH)], crystallizes in the triclinic space group P with four formula units in a cell of dimensions a= 22.199(11), b= 15.357(6), c= 10.223(4)Å, α= 103.78(3), β= 83.06(4), and γ= 88.89(4)°. The structure was solved by the heavy-atom method and refined by least-squares calculations to R= 0.095 for 3 437 counter data. It consists of two crystallographically independent, but chemically equivalent, Cu(bglyO)₂(bipy)(PrⁱOH) molecules, which are linked in dimeric units by hydrogen-bonding interactions. Each Cu atom shows a slightly distorted square-pyramidal five-co-ordination by the bidentate 2,2′-bipyridine (bipy) ligand and two N-benzyloxycarbonylglycinate (bglyO) ions in the equatorial plane, and by the propan-2-ol molecule in an apical position. The crystal packing is mainly determined by intermolecular stacking and hydrophobic interactions between 2,2′-bipyridine molecules and between phenyl groups, respectively. Its physical properties are also discussed in the light of its known crystal structure.