{Bis(3,5-Di-tert-butyl-2-oxidobenzyl)[2-(N,N-dimethylamino)ethyl]amine-κ⁴N,N′,O,O′}zinc(II) and {bis(3-tert-butyl-5-methyl-2-oxidobenzyl)[2-(N,N-dimethylamino)ethyl]amine-κ⁴N,N′,O,O′}(tetrahdyrofuran)zinc(II)

Abstract

The title zinc(II) complexes, [Zn(C(34)H(54)N(2)O(2))], (II), and [Zn(C(28)H(42)N(2)O(2))(C(4)H(8)O)], (III), were obtained as monomeric 1:1 complexes, in contrast with the calcium complexes supported by the same ligand class. Complex (II) crystallizes with two independent molecules in the asymmetric unit, which have similar geometric parameters. The donor atoms in (II) form a distorted trigonal-pyramidal arrangement around the zinc centre. Complex (III) contains a coordinated tetrahydrofuran molecule, resulting in a five-coordinate trigonal-bipyramidal arrangement around the Zn atom. The electron density provided by the coordination of this tetrahydrofuran molecule elongates the Zn-O and Zn-N bonds by approximately 0.07 and 0.10 A, respectively, in comparison with (II). Neither (II) nor (III) is active as an epsilon-caprolactone polymerization catalyst. The data presented here demonstrate that Zn may bind both an ONNO ligand and an additional oxygen-based ligand. The lack of activity is thus not due to steric hinderance at the metal atom.

Bis[2-hydroxy-N′-(2-methoxybenzylidene)benzohydrazidato]zinc(II)

“…(Downing & Urbach, 1969;Ganeshpure et al, 1996;Bosnich, 1968;Costes et al, 1995;Duda et al, 2003). The crystal structures of zinc(II) complexes have been widely studied (Howard et al, 2006;Granifo et al, 2006;Tong, 2005;You, 2005a,b). As an extension of the work on the structural characterization of Schiff base complexes, the preparation and crystal structure of the title Schiff base zinc(II) complex, (I), are reported here.…”

Bis[μ-2-methoxy-N′-(2-oxidobenzoyl)benzohydrazidato(3–)]dipyridinetrizinc(II)

“…The study of Schiff base compounds is of great interest in various fields of chemistry (Downing & Urbach, 1969;Ganeshpure et al, 1996;Bosnich, 1968;Costes et al, 1995;Duda et al, 2003). The crystal structures of zinc(II) complexes have been widely studied (Howard et al, 2006;Granifo et al, 2006;Tong, 2005;You, 2005). As an extension of work on the structural characterization of complexes, the preparation and crystal structure of the title trinuclear zinc(II) complex, (I), is reported here.…”