Reaction of bis(glycinato)copper(II) with formaldehyde and benzaldehyde phenylhydrazone: X-ray crystal structure of aquabis[(2,3,4,5-tetrahydro-2,6-diphenyl-1,2,4-triazin-4-yl)acetato-O,N4]copper(II) dihydrate

Abstract

The reaction of bis(glycinato)copper(II) with formaldehyde and benzaldehyde phenylhydrazone results in the formation of aquabis[2,3,4,5-tetrahydro-2,6-diphenyl-1,2,4-triazin-4-yl)acetato]copper(II) dihydrate, [Cu(L)₂(H₂O)]·2H₂O, which has been structurally characterized by X-ray diffraction studies. The compound crystallizes in the monoclinic space group Cc, with unit-cell dimensions a= 35.222(9), b= 6.1 26(4), c= 15.986(7)Å, β= 108.65(4)°, and Z= 4. The structure has been refined to R= 0.073 based on 1 128 independent observed reflections. The geometry about copper is grossly distorted octahedral with the two bidentate ligands occupying cis positions. A water molecule and a ‘free’ carboxyl oxygen atom from an adjacent (x,y+ 1,z) cell complete the six-coordination for copper. The latter two oxygen donor atoms, which are also cis, are at greater distances from the Cu atom than the oxygen and nitrogen donors from L.