Tetranuclear manganese(ii) complexes of sulfonylcalix[4]arene macrocycles: synthesis, structure, spectroscopic and magnetic properties†
Erwann Jeanneau,Anne Pillonnet,Arnaud Brioude,Matteo Martini,Olivier Stéphan,Faouzi Meganem,Ghenadie Novitchi,Dominique Luneau,Cédric Desroches
Dalton Transactions Pub Date : 01/23/2012 00:00:00 , DOI:10.1039/C2DT11786J
Abstract

Two tetranuclear manganese(II) complexes {K+[Mn4(ThiaSO2)2(OH)]} (1) and {K+[Mn4(ThiaSO2)2(F)]} (2) have been synthesized under solvothermal conditions in methanol with p-tert-butylsulfonylcalix[4]arene (ThiaSO2). For both complexes, the structure has been established from single-crystal X-ray diffraction. The two complexes are best described as manganese squares sandwiched between two thiacalixarene macrocycles. In both complexes, in the center of the square formed by the four manganese(II) atoms, the unexpected presence of μ4-OH or μ4-F gives a negative charge to the cluster. The two tetranuclear complexes exhibit strong orange luminescence behavior resulting from the symbiosis between the ThiaSO2 and the Mn2+. Despite similar chemical formulation, (1) and (2) present difference in emission intensity and lifetime τ.

Graphical abstract: Tetranuclear manganese(ii) complexes of sulfonylcalix[4]arene macrocycles: synthesis, structure, spectroscopic and magnetic properties