AN Fe(III) COMPLEX WITH THE DIANIONIC FORM OF 2,6-DIACETYLPYRIDINE BIS(ACYLHYDRAZONE). THE CRYSTAL STRUCTURE OF [DIAQUA-2',2''-(2,6-PYRIDINEDIYLDIETHYLIDYNE)DIOXAMO-HYDRAZIDE]IRON(III) PERCHLORATE TRIHYDRATE, [Fe (DAPSOX) (H_2O)_2]ClO_4 centre dot 3H

摘要

The title compound was prepared by a template synthesis from 2,6-diacetylpyridine, dioxamohydrazide and Fe(ClO_4)_3 centre dot 6H_2O (mol ratio 1:2:1) in MeOH/H_2O (3:1) solution and its structure determined by single-crystal X-ray diffraction; triclinic, space group P1-bar, a =7.5186(7), b = 10.9730(9), c = 14.6110(10) A, alpha = 95.866(1), beta = 100.252(1), gamma = 92.895(1), z = 2. The polydentate ligand is coordinated as a dianionic pentadentate while water molecules occupy apical positions in the structure. This is the first example of a monomeric, pentagonal bipyramidal structure of an Fe(III) complex with a dianionic bis(acylhydrazone) derivative of 2,6-diacetyl-pyridine.