STRUCTURE OF MU-(TEREPHTHALATO)-BIS[N,N'-ETHYLENEBIS(SALICYLALDIMINATO)IRON(III)]

Mu-(1,4-benzenedicarboxylato-O,O':O,"O"')-bis {2,2'-[1,2-ethanediylbis(iminomethyl)]diphenolato-N,N',O,O'}diiron(III), [Fe2(C16H14N2O2)2-(C8H4O4)], M(r) = 808.41, monoclinic, P2(1)/c, a = 6.954 (1), b = 17.196 (3), c = 15.333 (2) angstrom, beta = 99.53 (1)-degrees, V = 1808.2 (5) angstrom3, Z = 2, D(m) = 1.51, D(x) = 1.48 g cm-3, lambda(Cu Kalpha) = 1.5418 angstrom, mu = 68.48 cm-1, F(000) = 832, T = 293 K, R = 0.072 for 2432 observed reflections. The crystal used for the structure determination was a twin with partially coinciding reflections and the twin ratio alpha = 0.4936 (3). The molecule [Fe(salen)]2ter, where salen = N,N'-ethylenebis(salicylaldiminato) and ter = mu-(terephthalato), consists of two Fe(salen) complexes connected by the mu-(terephthalato) bridge. Each Fe atom is six coordinated by two donor atoms of the bridge and four donor atoms of the salen. Its properties are compared with those of the closely related [Fe(salen)Cl]2, [Fe(salen)]2O and [Fe(saloph)]2ter, where saloph = N,N'-o-phenylenebis(salicylaldiminato).