Crystal and molecular structure of µ-oxo-bis-[NN′-ethylenebis(salicylideneiminato)iron(III)]–bispyridine

Abstract

The crystal and molecular structure of [(Fe salen),0],2py (salen = NN'-ethylenebis(salicylideneiminato, py = pyridine) has been determined by single-crystal X-ray analysis. The crystallographic asymmetric unit comprises one dimeric molecule and two non-bonded pyridine molecules in a triclinic cell of dimensions, a = 12.73, b = 13-73, c = 13-92 8, cc = 11 8.75, p = 74.1 5, y = 11 6.1 7" ; space group PT. The iron atoms are joined by a single oxygen atom and both are five-co-ordinate with a distorted square pyramidal geometry. The mean Fe-O(bridge) bond length is 1-80 a and the bridging angle Fe-O-Fe is markedly bent a t 139". The properties of the dimeric molecule are compared with those of other oxo-bridged iron(ttl) and manganese(li1) dimers and also with the closely related [Fe salen CI], dimer and Fe salen CI monomer.

The synthesis, characterisation and application of iron(iii)–acetate complexes for cyclic carbonate formation and the polymerisation of lactide

“…This method has been previously been used to make a µ-oxo-bridged Fe(III)-salen complex by Webster and co-workers, 60 along with other examples of preparation and application of this complex in the literature. [61][62][63][64][65][66][67][68][69][70][71] However, with the range of salalen, salan and salen ligands (X) [72][73][74][75][76] used in this study, the Fe(X)OAc complex was consistently isolated (Scheme 1). All complexes were recrystallised or washed with cold ethanol and characterised by High-Resolution Mass Spectrometry (HR-MS), elemental analysis and Infra-Red spectroscopy (FT-IR).…”

The novel triazine cored tripodal and trinuclear Schiff base‐oxime metal complexes: Their magnetic properties and thermal decompositions

“…The magnetochemical properties of the μ‐oxo‐bridged complexes [{Fe(salen)} 2 O] [(salenH 2 = N , N ′ ‐bis(salicylidene) ethylenediamine)] and [{Fe(salophen)} 2 O] [(salophenH 2 = bis(salicylidene)‐2‐phenylenediamine)] and their X‐ray studies have widely been presented in the literature [15–22]. Koç and Ucan [23] have reported the synthesis and characterization of 1,3,5‐tricarboxylato bridges with [salenFe(III)] and [salophenFe(III)].…”

Coordination of gadolinium(iii) ions with a preformed µ-oxo diiron(iii) complex: structural and magnetic data

“…The four basal donors (N 2 O 2 ) are afforded by the ligand L while the apical position is occupied by the bridging oxygen, as in the previously published structural determinations of (Fesalen) 2 O complexes. [22][23][24] The structure results from the insertion of a gadolinium ion into each vacant coordination site of the dinuclear ferric complex 1. A double bridge links the Fe In the tetranuclear complex 2, the two gadolinium ions are ten coordinate.…”