Preparation, Structures and Properties of Novel Mono- and Trinuclear Iron(III) Complexes with Mixed Ligands

Abstract

Novel mono- and trinuclear iron(III) complexes with mixed ligands, FeIII(acac)(N-PhO-sal)(MeOH) 1 and FeIII3(acac)(N-PhO-sal)4 2 have been prepared and characterized, where acacH and N-PhOH-salH denote acetylacetone and N-2-hydroxyphenyl-salicylideneamine, respectively. The variable temperature magnetic susceptibilities (2-350 K) for complex 2 indicate that there is an intramolecular antiferromagnetic interaction among the iron(III) ions, and that spin-crossover behavior may take place from S = 5/2, 5/2 and 5/2 ground states to S = 1/2, 5/2 and 1/2 (Fe1, Fe2 and Fe1*) near 60 K and below.

A Bridge Too Far: Testing the Limits of Polypyridyl Ligands in Bridging Soluble Subunits of a Coordination Polymer

“…[27][28][29] We have begun to focus efforts on investigating the synthesis and properties of soluble coordination polymers and the potential to use them as a base to synthesise new materials. We selected the simple Schiff base salicylidene-2-aminophenol (H2L) on the basis that it has previously produced SMMs, [30][31][32] clusters [33][34][35] and coordination polymers. 36 This ligand can also form discrete species with ancillary ligands 37 and replacement of the latter with bridging ligands may potentially lead to coordination polymers.…”

Synthesis, structure, and magnetic properties of a tetradecanuclear manganese complex

“…Only a few mixed-valance Mn 14 [23][24][25][26][27][28][29]. The Schiff base compound H 2 L, which functions as a proligand [30][31][32], is prepared in situ by the condensation of 2-amino phenol and salicylaldehyde and is used in the synthesis of mononuclear complexes [33][34][35][36][37][38], a trinuclear complex [38] and heterometallic complexes [39]. In the present study, this ligand was used in the preparation of a new tetradecanuclear Mn II 6 Mn III 8 structure.…”

Slow Magnetization Relaxation in Unprecedented MnIII4DyIII3 and MnIII4DyIII5 Clusters from the Use of N-Salicylidene-o-aminophenol

“…Note that the saphH 2 ligand has been widely used for the isolation of mono-and dinuclear metal complexes 10 but with almost negligible presence in metal cluster chemistry. 11 With all of the above in mind, we decided to employ, for the first time, saphH 2 in Mn/Dy chemistry as a means of obtaining …”

“…Note that the saphH 2 ligand has been widely used for the isolation of mono-and dinuclear metal complexes 10 but with almost negligible presence in metal cluster chemistry. 11 With all of the above in mind, we decided to employ, for the first time, saphH 2 in Mn/Dy chemistry as a means of obtaining high-nuclearity heterometallic clusters with exciting structures, uncommon {Mn x Dy y } combinations, and interesting magnetic properties. The reaction of Mn(NO 3 ) 2 ·4H 2 O, Dy(NO 3 ) 3 ·5H 2 O, saphH 2 , and NEt 3 in a 1:2:2:2 molar ratio in MeCN led to a darkbrown suspension, which upon filtration gave a dark-red filtrate and a brown microcrystalline solid.…”

“…Among these, Schiff base ligands, and particularly N -salicylidene- o -aminophenol (saphH 2 , Chart ), should favor the formation of 3d/4f metal species via binding through the relatively soft N atom and the two hard, deprotonated O atoms. Note that the saphH 2 ligand has been widely used for the isolation of mono- and dinuclear metal complexes but with almost negligible presence in metal cluster chemistry …”