Preparation and Characterization of Di-μ-oxo Dimanganese(IV) Complexes with Bidentate Schiff Bases, N-Alkyl-salicylideneamine

Abstract

Novel di-μ-oxo dimanganese(IV) complexes, [MnIV(N-R-sal)2(μ-O)]2, with bidentate Schiff base ligands, N-alkyl-salicylideneamine, N-R-salH (R = n-C3H7 (Pr), n-C4H9 (Bu), n-C6H13 (Hx), n-C8H17 (Oct), n-C12H25 (Dod), or n-C18H37 (Octd)), have been prepared and characterized by spectroscopies, magnetic susceptibilities, thermal analysis and X-ray crystallography.

Synthesis of Cationic Oxorhenium Salen Complexes via μ-Oxo Abstraction and Their Activity in Catalytic Reductions

“…In conclusion, we have demonstrated a new synthetic method for the preparation of cationic oxorhenium hydrosilation catalysts by the abstraction of chloride and bridging oxo ligands with [Ph 3 …”

“…Rhenium complexes incorporating tetradentate bis(salicylideneamine) ligands, salenes, have been known for some time and have been developed primarily as catalysts for oxygen atom transfer reactions. − The cationic oxorhenium oxazoline complex [Re(O)(hoz) 2 (CH 3 CN)][B(C 6 F 5 ) 4 ] ( 1 ) was recently employed by our group for the dehydrogenative oxidation of organosilanes and hydrosilation of aldehydes and ketones . Struck by the similarity of the oxazoline ligand in 1 to commonly employed salen ligands, we attempted to synthesize oxorhenium salen complexes that could similarly be used for hydrosilation reactions and other metal-catalyzed reductions.…”

“…The latter reaction extends the chemistry of transition-metal μ-oxo complexes that were generally thought to be unreactive because of the inertness and stability of the M−O−M bond. Using this method, monomeric cationic complexes of other transition metals that are prone to forming μ-oxo complexes, such as Fe, Mn, and Mo, might become accessible. ,,, …”

“…Rhenium complexes incorporating tetradentate bis(salicylideneamine) ligands, salenes, have been known for some time and have been developed primarily as catalysts for oxygen atom transfer reactions. [1][2][3][4][5] The cationic oxorhenium oxazoline complex [Re(O)(hoz) 2 (CH 3 CN)][B(C 6 F 5 ) 4 ] (1) was recently employed by our group for the dehydrogenative oxidation of organosilanes 6 and hydrosilation of aldehydes and ketones. 7 Struck by the similarity of the oxazoline ligand in 1 to commonly employed salen ligands, we attempted to synthesize oxorhenium salen complexes that could similarly be used for hydrosilation reactions and other metal-catalyzed reductions.…”

Hetero-bimetallic yttrium(III)–rhenium(V)(salen) tetranuclear complex: Synthesis and crystal structure

“…This can also be used in radiotherapy [7] as a nucleide with its isotopes 186 Re and 188 Re which emit b radiation. Tetradentate bis(salicylidenamine) Rhenium compounds were also developed for catalytic applications like transfer reactions of oxygen atom [3,[8][9][10][11]. Recently, Schiff-base manganese complexes were used to obtain polynuclear molecules [12] and one-dimensional compounds which present a slow relaxation of the magnetization [13,14].…”