Thermal properties and crystal structures of manganese(III)-salen complexes with the Tf2N anion [Tf2N=bis(trifluoromethanesulfonyl)amide)]
摘要:
A series of salts comprising cationic manganese(III)-salen complexes and the Tf2N anion has been prepared (salen = N.N'-bis(salicylideneaminato)ethylene, Tf2N = bis(trifluoromethanesulfonyl)amide) to investigate the effects of axial ligands and substituents on their thermal properties. [Mn(salen)L-2][Tf2N] (L= H2O, pyridine) and their 5-butoxysalen analogs undergo thermal desorption of the axial ligands, followed by decomposition above 250 degrees C. The pyridine complexes exhibit two-step ligand desorption, corresponding to the formation of a dimer and later, desorption from the dimer. Complexes with L = 3-butylpyridine and N-butylimidazole melt at 97.6 and 132.7 degrees C, respectively, before ligand desorption. Crystal structures of these and related complexes have been determined. [Mn(salen)(3,3'-bipyridine)][Tf2N] is a coordination polymer with higher thermal stability. (C) 2012 Elsevier Ltd. All rights reserved.