Rotamers of the 1-phenylethylamine ligand in trans- bis(imidato)bis(1-phenylethylamine)copper(II) complexes, where imidato = 3,3-dimethylglutarimidato, hydantoinato and succinimidato ligands

Abstract

Three [CuN 4] complexes, red trans-[Cu(3,3-dmgluim) 2( R-phenea) 2] ( 1), blue-violet trans-[Cu(hyd) 2( R-phenea) 2] ( 2) and blue trans-[Cu(succim) 2( S-phenea) ( R-phenea)] ( 3) (3,3-dmgluim=3,3-dimethylglutarimidato, hyd=hydantoinato, succim = succinimidato, phenea = 1-phenylethylamine), were prepared and their crystal structures were determined. Crystal data are as follows: 1 is monoclinic, space group P2 1, a = 14.854(1), b = 17.105(3), c-5.988(2) Å, β=91.65(1)°, U=1520.8(5) Å 3, Z=2, R=0.033, and 2318 reflections; 2 is monoclinic, space group P2 1, a = 19.946(2), b = 6.035(1), c = 10.025(1) Å,β= 104.383(7)°, U= 1168.9(3) Å 3, Z=2, R =0.035, and 1864 reflections; 3 is triclinic, space group P 1 , a = 12.434(4), b = 12.670(3), c = 8.765(2) Å, α=94.83(2), β= 112.87(2) γ=73.15(2)°, U= 1219.9(6) Å 3, Z=2, R=0.054, and 3678 reflections. In 1 the coordination geometry is planar, and the specific intermolecular hydrogen bonds are formed along the c axis between H(NH 2) of phenea and O(CO) of the six- membered cyclic imidate. In 2 and 3 the coordination geometries are tetrahedrally distorted. The intramolecular hydrogen bonds are formed between H(NH 2) of phenea and O(CO) of the five-membered cyclic imidate. Three different staggered forms of and one eclipsed form of rotamers in the phenea ligands have been found.