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- W2077398049 endingPage "2365" @default.
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- W2077398049 abstract "Two new manganese(II) compounds of formula [Mn(mal)(H2O)(2,4′-bpy)]n (1) and [Mn2(mal)2(H2O)2(4,4′-bpy)]n (2) (2,4′-bpy = 2,4′-bipyridine, 4,4′-bpy = 4,4′-bipyridine and H2mal = malonic acid) have been prepared and structurally characterized by X-ray crystallography. Their structures are made up of two- (1) and three-dimensional (2) arrangements of manganese atoms linked by carboxylate-malonate groups in the anti–syn bridging mode (1 and 2) and bis(monodentate) 4,4′-bpy (2). The 2,4′-bpy group in 1 acts as a monodentate ligand. Each manganese atom in 1 and 2 is six-coordinated with four carboxylate-oxygens in the equatorial plane and a nitrogen atom and a water molecule in the axial positions. The magnetic properties of 1 and 2 and those of the related sheet-like polymer [Mn(mal)(H2O)2]n (3) (whose structure was published elsewhere, orthorhombic Pca21) have been investigated in the temperature range 2.0–290 K. The magnetic coupling between the manganese(II) ions in 1 and 2 through the single carboxylato bridge is weakly antiferromagnetic and practically identical (Jca. −0.2 cm−1). Weak antiferromagnetic coupling is also observed in complex 3 (occurrence of carboxylate bridges in the anti–anti and anti–syn bridging modes) together with spin canting behaviour at very low temperatures (Tc = 2.7 K). The antisymmetric exchange is most likely responsible for the small canting observed in 3." @default.
- W2077398049 created "2016-06-24" @default.
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- W2077398049 date "2003-01-01" @default.
- W2077398049 modified "2023-10-18" @default.
- W2077398049 title "Crystal structures and magnetic properties of two- and three-dimensional malonato-bridged manganese(<scp>ii</scp>) complexes" @default.
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- W2077398049 doi "https://doi.org/10.1039/b300291h" @default.
- W2077398049 hasPublicationYear "2003" @default.
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