Wydział Chemii

Józef Utko

Angelos B. Canaj

Constantinos J. Milios

Danuta Dobrzyńska

Katarzyna Pawlus

Alicja Mikołajczyk

Tadeusz Lis

2014

Inorganica Chimica Acta

409

458-464

10.1016/j.ica.2013.09.017

Naukowa

Angielski

Artykuł

The reaction of Mn⁰ and HgCl₂ with triphenylacetic acid in a mixture of 2-methoxyethanol and toluene afforded complex [Mn₂^IICl₂(O₂CCPh₃)₂(2-methoxyethanol)₃] (1) in very good yield. Repeating the same reaction and replacing 2-methoxyethanol with THF forms the complex [Mn₃^IICl_3.04(O₂CCPh₃)_1.96(2-methoxyethanol)(THF)₄] (2) in good yield. Furthermore the reaction between Mn⁰ and triphenylacetic acid in a mixture of THF and toluene after heating produces the complex [Mn₄Cl₅Na(O₂CCPh₃)₄(THF)₆] (3). Finally, the reaction between MnCl₂ and potassium triphenylacetate or lithium triphenylacetate in THF and toluene gave complexes [Mn₄Cl₅K(O₂CCPh₃)₄(THF)₆] (4) and [Mn₄Cl₅Li(O₂CCPh₃)₄(THF)₅]·0.75(THF) (5·0.75THF), respectively, in good yields. The crystal structures of 1–5 have been determined by single-crystal X-ray crystallography. Complex 1 is a chloride bridged [Mn^II₂] dimer in which the two metal ions are found in an O₅Cl and an O₃Cl₂ coordination environment. Complex 2 is a trinuclear [Mn^II₃] triangle-like cluster in which the “central” Mn^II ion is bridged via two chloride ions to the peripheral Mn²⁺ ions, additionally all manganese ions are connected by oxygen ion in a μ₃ mode. Complexes 3–5 are all tetranuclear [Mn^II₄Cl₅]³⁺ metallic clusters displaying similar geometries, in which the tetrametallic core unit possesses a planar square arrangement. DC magnetic susceptibility studies indicate the presence of dominant antiferromagnetic exchange for all 1–4 clusters.

manganese clusters, Halide bridged clusters, crystal structure, magnetic properties, Antiferromagnetic interactions

http://dx.doi.org/10.1016/j.ica.2013.09.017

http://www.elsevier.com