Hydrogen-bonded networks in oxygen-coordinated monoamide complexes of zinc(II)

Abstract

The preparation of the bulky secondary amideN-(2,6-diisopropylphenyl)-2,2-dimethylpropanamide and the determi-nation of its crystal structure at 173(2) K are reported. The structure displays disorder of thetBu methyl groups due to thermalmotion and an infinite N–H····O=C hydrogen-bonded chain described by aC11 4 graph set. Reaction of this amide withZnCl2orZnBr2in tetrahydrofuran (THF) results in dihalo-(tetrahydrofurano)-(N-(2,6-diisopropylphenyl)–2,2-dimethylpropanamido)-zinc(II)complexes (Cl, Br) for which the crystal structures have also been determined. These complexes, as well as a chloroform solvate of thedichloro-complex, contain N–H····X–Zn hydrogen-bonded chains described byC11 6 graph sets. Evaporative crystallization results inthe loss of both chloroform and THF to afford crystals determined to bebis( 2-chloro)-dichloro-bis(N-(2,6-diisopropylphenyl)-2,2-dimethylpropanamido)-dizinc(II) by single crystal X-ray diffraction. This dimeric complex shows a complex network ofN–H····Cl–Zn hydrogen bonds describable byC11 6 ,C11 8 , andC22 16 chains, smallR44 28 molecular “squares”, and largerR66 44 rings