Porous 2D coordination polymeric formate built up by Mn(II) linking of Fe3O units: influence of guest molecules on magnetic properties.
A first representative of coordination polymers, built from polynuclear carboxylate bridged by mononuclear carboxylate, has been synthesised and structurally characterized. The compound [{Fe(3)O(HCOO)(6)}{Mn(HCOO)(3)(H(2)O)(3)}].3.5HCOOH crystallised in the hexagonal system (space group P6(3)), a = b = 12.369(5) A, c = 12.992(5) A, alpha = beta = 90 degrees , gamma = 120 degrees , V = 1721.4(12) A(3). The crystal structure is built from 2D layers, which are formed by the linking of trinuclear {Fe(3)O(HCOO)(6)}(+) units by mononuclear {Mn(HCOO)(3)(H(2)O)(3)}(-) bridges. These 2D honeycomb layers are connected by molecules of formic acid through a hydrogen bond network. The compound has the voids at the centre of the hexagons. These voids are filled by captured solvent molecules. Solvate molecules are also located between the 2D layers, linking them through a system of H-bonds. All these solvates can be easily removed and/or exchanged, which results in the formation of [{Fe(3)O(HCOO)(6)}{Mn(HCOO)(3)(H(2)O)(3)}].0.5HCOOH.H(2)O and [{Fe(3)O(HCOO)(6)}{Mn(HCOO)(3)(H(2)O)(3)}]. Magnetic properties of the compounds can be considered as the superposition of magnetism of Fe(3)O trinuclear units, for which magnetism is governed by the superexchange interaction between Fe(3+) spins (with one Fe-Fe superexchange parameter J) and the magnetism of spins of Mn(2+) ions, the interactions between these units can be taken into account by molecular field, zJ'. The destruction of the hydrogen bond network caused by evacuation of solvent molecules significantly modifies the overall magnetism. It was found that zJ' depends on the presence of solvent molecules in the structure.
Lytvynenko
Anton S
AS
L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of the Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine.
Kolotilov
Sergey V
SV
Cador
Olivier
O
Gavrilenko
Konstantin S
KS
Golhen
Stéphane
S
Ouahab
Lahcène
L
Pavlishchuk
Vitaly V
VV
D018360:Crystallography, X-Ray; D005290:Ferric Compounds / Q000737:chemistry*; D005561:Formates / Q000737:chemistry; D006358:Hot Temperature; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D014961:X-Ray Diffraction
D005290:Ferric Compounds; D005561:Formates; D009942:Organometallic Compounds; D011108:Polymers; C030544:formic acid; D008345:Manganese