Abstract
The title compound, [Mn2(C7H4NO4)4(C6H7N)4] or [Mn2(μ-NBz)2(κ2-NBz)2(4-Mepy)4], where NBz is 4-nitro-benzoate and 4-Mepy is 4-methyl-pyridine, is a centrosymmetric dinuclear complex in which the MnII atoms are bridged by two NBz ligands with Mn⋯Mn = 4.1324 (4) Å. The MnII atom in this dimeric species is present in a distorted octa-hedral environment with the four coordinating O atoms forming the equatorial plane and the two pyridyl N atoms occupying the axial sites. An important structural feature of the dimeric complex is that each of the bridging carboxyl-ate ligands binds to the metal ions in an asymmetric fashion involving bent and linear Mn-O-C units. The crystal packing is consolidated by C-H⋯O and C-H⋯π interactions.
Highlights
Polynuclear manganese complexes with carboxylate ligation have received great attention due to their potential applications in catalysis (Arafa et al, 2014), magnetism (Miyasaka et al, 2004) and their antitumor activity (Dey et al, 2015) as well as in other areas
[Mn2(bbppnol)(-O2CCH3)2] [bbppnol = N,N0 -bis(2-hydroxybenzyl)N,N0 -bis(2-methylpyridyl)-2-ol-1,3-propanediamine] with two bridging acetato ligands is active as a catalyst in the epoxidation of cyclohexene and cyclooctene (Castaman et al, 2009)
Manganese complexes are recognized for their magnetic behaviour since coordination compounds of this metal often display large ground-state spin (S) values and the polynuclear manganese cluster [Mn12O12(CH3COO)16(H2O)4]2CH3COOH4H2O is considered to be the first single molecule magnet (SMM) (Uhrecký et al, 2013; Sessoli et al, 1993)
Summary
Polynuclear manganese complexes with carboxylate ligation have received great attention due to their potential applications in catalysis (Arafa et al, 2014), magnetism (Miyasaka et al, 2004) and their antitumor activity (Dey et al, 2015) as well as in other areas. Keeping in mind earlier results published from our laboratory (Chakrabarty et al, 2007) on the synthesis and catalytic properties of cobalt(III)–oxide pseudo-cubane units of the type [Co4O4(-O2CR)4L4], where R is an alkyl or aryl group and L is a monodentate pyridyl ligand, and due to their relevance as catalysts for the water-oxidation reaction (McCool et al, 2011), we explored whether analogous manganese complexes could be synthesized. These efforts have led to the synthesis of the title complex, among others. We report the synthesis, crystal structure and some salient properties of the dimeric manganese(II) compound [Mn2(-NBz)2(2-NBz)2(4-Mepy)4], I, which belongs to a structure type constituted of only a limited number of complexes (vide infra)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
