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Synthesis, crystal structure and magnetic properties of a trinuclear phenolate bridged manganese complex containing Mn(II)–Mn(III) ions.

Autorzy

Rahman Bikas

Hassan Hosseini-Monfared

Joaquin Sanchiz

Miłosz Siczek

Tadeusz Lis

Rok wydania

2014

Czasopismo

RSC Advances

Numer woluminu

4

Strony

36175-36182

DOI

10.1039/C4RA05964F

Kolekcja

Naukowa

Język

Angielski

Typ publikacji

Artykuł

Streszczenie

A trinuclear manganese complex containing Mn(III)–Mn(II)–Mn(III) cores, [Mn3(bp)4(CH3OH)]·0.875CH3OH·0.125H2O (1), has been prepared and structurally characterized where H2bp is an O3-donor bis(phenolate) ligand {H2bp = 2,2′-sulfinylbis(4-methylphenol)}. The combined structural and magnetic analysis reveals the mixed valence character of the compound with one central Mn(II) ion and two outer Mn(III) ions connected by phenolate bridging groups. The Mn(III)–Mn(II)–Mn(III) angle is close to a linear arrangement (∼160°) and the Mn(II)⋯Mn(III) separations are about 3.21 Å. The coordination environment around the two terminal Mn(III) ions is distorted octahedral (O6) and shows Jahn–Teller elongation, while the central Mn(II) has a distorted five coordinated trigonal-bypyramidal (O5) coordination environment. In the central Mn(II) the equatorial Mn–O bond lengths are shorter than the axial Mn–O ones. The crystal packing of 1 involves hydrogen bonding between the complex and the uncoordinated methanol molecule. The analysis of the magnetic susceptibility data is consistent with ferromagnetic intramolecular coupling among the Mn(III) and the Mn(II) ions. The system can be interpreted in terms of a simple Heisenberg–Dirac–Van Vleck model H = −J(S1S2 + S2S3) with a magnetic coupling constant of J = 0.28 cm−1.

Adres publiczny

http://dx.doi.org/10.1039/C4RA05964F

Strona internetowa wydawcy

https://www.rsc.org/

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