Synthesis and Physicochemical Properties of Chromium(III) and Iron(III) Complexes with Bromonitrofluorenones

Polynuclear complexes [M3O(CH3COO)6(H2O)2L]OH and Fe2O(CH3COO)4L2 2 (H2O)2, where M = Cr(III), Fe(III); L = 5-bromo-2,4,7-trinitrofluorenone (L1) and 4,5-dibromo-2,7-dinitrofluorenone (L2), were synthesized. Quantum-chemical calculation of the electronic structure and spectra of 5-chloro-2,4,7-trinitrofluorenone was performed by the Pariser-Parr-Pople method. IR and electronic absorption spectra indicate that bromonitrofluorenones are incorporated into trinuclear (μ-oxo)acetato complexes as neutral terminal ligands coordinated through the carbonyl oxygen.